Patent Publication Number: US-2022213979-A1

Title: Cooling of air actuated valve using actuating air

Description:
TECHNICAL FIELD 
     The present embodiments relate to a valve for controlling flow of a fluid. In particular, the valve includes an actuation housing configured for actuating a poppet using actuation air. The valve is configured for cooling, such that when the poppet is in the open and/or closed position, actuating air flowing between the first port and the second port cools the stem. 
     BACKGROUND OF THE DISCLOSURE 
     Many modern semiconductor fabrication processes are performed in plasma process modules in which a substrate is held on a substrate holder when exposed to a plasma. Deposition of thin films is one of the key processes in semiconductor manufacturing. A typical wafer goes through deposition of several thin films, some of which may completely or partially remain in the final electronic device, while others may only temporarily remain on the wafer and serve some intermediate processing needs. For example, an ashable hard mask film may be used as an etch hardmask layer. Such film is first deposited on a wafer and then partially removed to define circuit line patterns. An etchant is then applied to remove some of the underlying dielectric forming trenches and vias for the future circuit lines. Eventually, all remaining ashable hard mask films are removed from the wafer. Various deposition processes are used to deposit thin films. For example, an ashable hard mask film may be deposited using chemical vapor deposition (CVD), or more specifically plasma enhanced chemical vapor deposition (PECVD), processes. 
     One consequence of almost any deposition process is that the film material is not only deposited onto the wafer but also on the interior surfaces of the deposition chambers, thereby forming residues. These residues can build up over time and dissolve, detach or otherwise disperse through the deposition chamber causing contamination. The built-up residues are periodically removed to avoid such contamination. A remote plasma clean (RPC) process may be performed to deliver plasma-activated species included in a cleaning reagent mixture to a deposition chamber. The cleaning reagent mixture is generated in a remote plasma generator separate from the deposition chamber and delivered through an RPC delivery system. After delivery, the plasma-activated species in the deposition chamber etch the deposition residue for removal. 
     However, recombination of activated species while flowing to the deposition chamber may occur. Recombination generates excessive heat within the RPC delivery system, which may lead to failure in the system. For example, the heat may reduce the usable lifetime of seals within the RPC delivery system, wherein the seals may be configured to isolate the RPC delivery system from the deposition chamber during processing operations (e.g., deposition). Failure of the seals may allow for process gases to escape from the deposition chamber and travel through the RPC delivery system disabling the benefit of the isolation valve and adversely affecting process conditions. 
     The background description provided herein is for the purposes of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure 
     It is in this context that embodiments of the disclosure arise. 
     SUMMARY 
     The present embodiments relate to solving one or more problems found in the related art, and specifically to include a valve for controlling fluid flow, wherein the valve in an open and/or closed position is configured for an internal flow of actuating air to cool interior components of the valve. Several inventive embodiments of the present disclosure are described below. 
     Embodiments of the present disclosure include a valve. The valve includes an actuation housing of a valve body and surrounding an actuation cavity, the actuation housing including a first port configured for entry of actuating air, and a second port configured for exhausting the actuating air. A poppet is configured for movement within the valve body and including a barrier located within the actuation cavity, the poppet being actuated to an open position using the actuating air entering in the first port. When the poppet is in the open position, the actuating air flowing between the first port and the second port cools the stem. 
     Other embodiments of the present disclosure include a method for operating a valve. The method includes providing actuating air to a first port of an actuation housing of a valve body of the valve. The actuation housing surrounds an actuation cavity. A poppet is configured for movement within the valve body and includes a barrier located within the actuation cavity. The method includes actuating the poppet to an open position using the actuating air entering the first port. The method includes exhausting the actuating air entering from the first port to atmosphere through a second port of the actuation housing when the poppet is in the open position. The method includes cooling the stem using actuating air flowing between the first port and a second port of the actuation housing. 
     Other embodiments of the present disclosure include a valve suitable for use with a process chamber. The valve includes a valve body configured for controlling flow of plasma from a remote source (e.g., remote plasma clean, RPC, source) to the process chamber. The valve includes a sealing cavity of the valve body surrounding a sealing cavity. The sealing housing includes an inlet port configured for entry of the plasma and an outlet port configured for providing access to the process chamber from the sealing cavity. The valve includes an actuation housing surrounding an actuation cavity. The actuation housing includes a common wall separating the sealing cavity from the actuation cavity, a first port configured for entry of actuating air, and a second port configured for exhausting the actuating air. The valve includes a poppet configured for movement within the valve body. The poppet includes a stem connecting a sealing plunger located within the sealing cavity to a barrier located within the actuation cavity through a first opening in the common wall. The poppet being actuated to an open position using the actuating air entering in the first port. 
     Other embodiments of the present disclosure include a method for cleaning a process chamber. The method includes actuating a valve using actuating air to an open position. The method includes providing a plasma from a remote source (e.g., remote plasma clean, RPC, source) to the valve configured for controlling flow of the plasma to the process chamber. The method includes exhausting the actuating air from the valve to atmosphere when the valve is in the open position to cool the valve. 
     Still other embodiments of the present disclosure include a cleaning system for cleaning a process chamber configured for depositing a film on the wafer. The cleaning system includes the plasma processing chamber that further includes a pedestal configured for supporting the wafer. The cleaning system includes a shower head configured for directing process gases towards the wafer. The cleaning system includes a remote source (e.g., remote plasma clean, RPC, source) for generating plasma. The cleaning system includes a valve for controlling flow of the plasma to the process chamber. The valve includes a valve body configured for controlling flow of the plasma to the process chamber. The valve includes a sealing cavity of the valve body surrounding a sealing cavity. The sealing housing includes an inlet port configured for entry of the plasma and an outlet port configured for providing access to the process chamber from the sealing cavity. The valve includes an actuation housing surrounding an actuation cavity. The actuation housing includes a common wall separating the sealing cavity from the actuation cavity, a first port configured for entry of actuating air, and a second port configured for exhausting the actuating air. The valve includes a poppet configured for movement within the valve body. The poppet includes a stem connecting a sealing plunger located within the sealing cavity to a barrier located within the actuation cavity through a first opening in the common wall. The poppet being actuated to an open position using the actuating air entering in the first port. 
     These and other advantages will be appreciated by those skilled in the art upon reading the entire specification and the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The embodiments may best be understood by reference to the following description taken in conjunction with the accompanying drawings. 
         FIG. 1A  illustrates an overall system including a process chamber suitable for use in depositing a film on a wafer and/or substrate, and a cleaning apparatus that is configured to remove residue from interior surfaces of the reactor system. 
         FIG. 1B  is a top view of a multi-station processing tool, wherein each processing tool includes a cleaning apparatus configured to remove residue for interior surfaces of corresponding processing stations and/or process chambers, in accordance with one embodiment of the present disclosure. 
         FIG. 2A  is a diagram of a valve system configured for controlling fluid flow, wherein the valve is in an open position, and wherein an actuating air flow cools the valve, in accordance with one embodiment of the present disclosure. 
         FIG. 2B  is a diagram of a valve system configured for controlling fluid flow, wherein the valve is in a closed position, and wherein an actuating air flow cools the valve, in accordance with one embodiment of the present disclosure. 
         FIGS. 3A-3C  are illustrations of a valve controlling fluid flow as the valve is moving to an open position as described in  FIG. 2A , in accordance with one embodiment of the present disclosure. 
         FIG. 4  is a diagram of a valve system configured for controlling fluid flow, wherein the valve is in a closed position, in accordance with one embodiment of the present disclosure. 
         FIGS. 5A, 5B, 5C-1, and 5C-2  are illustrations of a valve controlling fluid flow as the valve is moving to a closed position as described in  FIG. 2B , in accordance with one embodiment of the present disclosure. 
         FIG. 6  is a cut-away view from a top of a first configuration of a valve configured for controlling fluid flow, wherein in either an open or closed position, an actuating air flow cools the interior of the valve, in accordance with one embodiment of the present disclosure. 
         FIG. 7  is a flow diagram illustrating a method for cooling a valve that is configured for controlling fluid flow using actuating air, in accordance with one embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Although the following detailed description contains many specific details for the purposes of illustration, anyone of ordinary skill in the art will appreciate that many variations and alterations to the following details are within the scope of the present disclosure. Accordingly, the aspects of the present disclosure described below are set forth without any loss of generality to, and without imposing limitations upon, the claims that follow this description. 
     Generally speaking, the various embodiments of the present disclosure describe systems and methods for cooling a valve using actuation air. In particular, piston valves actuated using actuation air (e.g., compressed dry air—CDA) are cooled using actuation air in order to cool internal components of the valve, thereby extending the life of the valve when exposed to high temperatures. Specifically, actuating air is used to cool a stem of the valve that is in direct contact with the housing of one or more seals. In that manner, embodiments of the present disclosure provide for localized cooling of the stem, which allows for all seals installed on the stem or adjacent to the stem to operate at lower temperatures. In addition, cooling of the stem of the valve using actuating air is sufficient for cooling the components of the valve. As such, no additional cooling agents or systems to cool the valve, are needed. Further, embodiments of the present disclosure provide for close control of the cooling time during which the valve is cooled. 
     With the above general understanding of the various embodiments, example details of the embodiments will now be described with reference to the various drawings. Similarly numbered elements and/or components in one or more figures are intended to generally have the same configuration and/or functionality. Further, figures may not be drawn to scale but are intended to illustrate and emphasize novel concepts. It will be apparent, that the present embodiments may be practiced without some or all of these specific details. In other instances, well-known process operations have not been described in detail in order not to unnecessarily obscure the present embodiments. 
       FIG. 1A  illustrates a plasma processing system  100  including a process chamber  102  suitable for use in performing one or more plasma processing operations (e.g., depositing a film on a wafer and/or substrate, atomic layer deposition (ALD) etching, clean, etc.), and an RPC cleaning system that is configured to remove residue from interior surfaces of the process chamber  102 . In one embodiment, a valve  120  actuated using actuating air may be implemented within the reactor system  100  for purposes of isolating the RPC path. 
       FIG. 1A  is shown merely to illustrate one use case of valve  120  (e.g., wafer fabrication in plasma processing modules), wherein actuating air may be used to cool one or more components of valve  120  during operation (e.g., clean process). In other embodiments, valve  120  may be implemented within any system that exposes the valve  120  to high temperatures, such that actuating air may be used to cool valve  120  under high temperatures to lower the operating temperature of the valve  120  and to extend the lifetime of valve  120 . 
     More particularly,  FIG. 1A  illustrates a plasma processing system  100 , which is used to process a wafer  101 . For example, plasma processing modules may be used in plasma etch chamber or module, a deposition chamber or module, a spin-rinse chamber or module, a metal plating chamber or module, a clean chamber or module, a bevel edge etch chamber or module, a physical vapor deposition (PVD) chamber or module, a chemical vapor deposition (CVD) chamber or module, an atomic layer deposition (ALD) chamber or module, a plasma enhanced chemical vapor deposition (PECVD) chamber or module, an atomic layer etch (ALE) chamber or module, an ion implantation chamber or module, a track chamber or module, and any other semiconductor processing systems that may be associated or used in the fabrication and/or manufacturing of semiconductor wafers to include processes such as electroplating, electroetching, electropolishing, electro chemical mechanical polishing, deposition, wet deposition, and through silicon via (TSV) processes. 
     In the embodiment of  FIG. 1A , the term “substrate” as used herein refers to a semiconductor wafer in embodiments of the present disclosure. However, it should be understood that in other embodiments, the term substrate can refer to substrates formed of sapphire, GaN, GaAs or SiC, or other substrate materials, and can include glass panels/substrates, metal foils, metal sheets, polymer materials, or the like. 
     The process chamber  102  includes a pedestal  140 . A semiconductor substrate  101  is shown disposed over pedestal  140 . A shower head  150  is used to supply process gases utilized to create and generate a plasma in chamber  102 . During plasma processing (e.g., deposition, etching, etc.), one or more gases are supplied to the process chamber  102  depending on the process recipe being performed. Controller  110  is used to provide instructions to the various components of the reactor system  100 , including facilities as gas supply  114 , pressure controls, temperature controls, and other processing parameters. Sensors  115  may be configured to sense various control parameters of the plasma processing system used for process control (e.g., deposition, clean, etc.). 
     For example, controller  110  may execute process input and control  108  to include process recipes, such as power levels, timing parameters, process gasses, mechanical movement of the wafer  101 , etc., such as to deposit or form films over the wafer  101 . Depending on the processing being performed, the control module  110  controls the delivery of process gases. The chosen gases are then flown into the shower head  150  and distributed in a space volume defined between the shower head  150  face that faces that wafer  101  and the wafer  101  resting over the pedestal  140 . Appropriate valving and mass flow control mechanisms may be employed to ensure that the correct gases are delivered during the deposition and plasma treatment phases of the process. Process gases exit chamber via an outlet. A vacuum pump  185  draws process gases out and maintains a suitably low pressure within the reactor by a close loop controlled flow restriction device, such as a throttle valve or a pendulum valve. 
     The substrate processing system  100  may be configured for cooling valve  120  (e.g., isolation valve configured for controlling flow of RPC plasma to a process chamber). For example, controller  110  may control actuation of valve  120  to control isolation of valve  120  from chamber  102  during plasma processing, or to introduce cleaning reagents into chamber  102  during a clean operation, and/or for cooling the valve  120  during the clean operation using actuating air. As shown in  FIG. 1A , actuating air (e.g., CDA) piston actuated valves are cooled using actuating air in order to protect seals configured for isolating chambers of the valve from the process chamber from high temperature conditions, thereby extending the life of the valve  120 . High temperatures exposed to the valve  120  may be due in part to plasma (e.g., from an RPC source) recombination in chambers of the valve  120 , and/or heat generated within the process chamber during a clean operation or any other plasma processing operation. 
     Generally, actuating air (e.g., CDA) is used to cool a stem of the valve  120  that is in direct contact with the housing of one or more seals, in one embodiment. In that manner, embodiments of the present disclosure provide for localized cooling of the stem, which allows for all seals installed on the stem or adjacent to the stem to operate a lower temperatures. In addition, cooling of the stem of the valve  120  using actuating air (e.g., CDA) is effective for cooling the components of the valve  120 . For example, effective cooling is provided using actuating air such that the substrate processing system  100  of  FIG. 1A  does not require any additional cooling agents or systems to cool the valve  120 , such as during a clean operation. Further, embodiments of the present disclosure provide for close control of the cooling time during which valve  120  is cooled, as will be described below. 
     A remote plasma clean (RPC) cleaning system may be configured to remove residue from interior surfaces of the process chamber  102 . The valve system  200  may be controlled using control module  110 , or in combination with another controller to control process conditions during a cleaning operation. For example, cleaning reagents  111  and optionally inert gases are introduced via RCP unit  112  (e.g., RPC generator) into the process chamber  102  that react with residue (e.g., formed during deposition) and form volatile products, which are pumped out of the chamber  102  using exhaust pump  185 . 
     To expedite the clean process, cleaning reagents  111  are activated in a remote plasma clean (RPC) unit  112  to form cleaning reagent radicals, ions, and high energy atoms and molecules, which form a more reactive cleaning mixture (e.g., more reactive with the residue) than the more stable cleaning reagents  111 . 
     RPC unit  112  may include a high power radio frequency (RF) generator providing energy to dissociate the cleaning reagents into radicals in RPC unit  112 , which then form reactive atoms and ions, which are then used to etch the residue. For example, fluorine containing cleaning reagents may be introduced in RPC unit  112 , which is remote from or external from the process chamber  102 , to generate plasma (e.g., a cleaning mixture) including activated species of cleaning reagents used for cleaning the process chamber  102 . RPC unit  112  may be a self-contained device generating weakly ionized plasma using the cleaning reagents  111 . 
     After passing through the RPC unit  112 , the plasma or cleaning mixture is introduced into the process chamber  102  for cleaning, which may involve flowing the plasma through a distribution path connecting the RPC unit  112  and the process chamber  102 , wherein the plasma may be introduced into the process chamber  102  through shower head  150 . The distribution path includes valve  120  (e.g., isolation valve) that is configured for controlling flow of plasma to the process chamber  102 , and more particularly for isolating the RPC unit  112  from the process chamber  102 . In one embodiment, the actuating air is compressed dry air (CDA), wherein source  113  is a CDA source. The plasma (cleaning mixture) reacts with residue in the interior of the process chamber  102  to form volatile compounds. Remaining un-reacted mixture, inert gases, and the volatile compounds are then evacuated from the chamber  102  using exhaust pump  185 , for example. 
     The RPC unit  112  provides a high degree of activation of cleaning reagents  111 , but many of these activated species may go back to their neutral state before reaching the process chamber  102 . For example, activated cleaning reagents may recombine while flowing to the process chamber, such as recombining in the valve  120 . In particular, the activated cleaning reagents may include neutral fluorine radicals, portions of which may recombine into a non-reactive form along the distribution path to the process chamber  102 . During recombination, heat may be generated. Recombination within the valve  120  may produce excessive heat, that left untreated may excessively increase the operating temperature of the valve  120  leading to premature damage of the valve  120 , to include one or more seals configured to isolate plasma and/or gases within the process chamber  102  from actuating air source  113 . For example, the seals (e.g., O-rings) may be formed from perfluoro-elastomer (FFKM) which break down under extreme temperatures. In addition, heat may damage other components, such as an optional optical sensor (not shown) configured for sensing the position and/or state of valve  120 . 
     For purposes of illustration, a clean process cycle may range between 5 to 15 minutes. One to three consecutive clean process cycles may be performed, wherein the entire period for the clean process (e.g., one or more clean process cycles) may range between 5 to 30 minutes in one implementation, 5 to 20 minutes in another implementation, 5 to 15 minutes, as examples. For purposes of illustration, the operating temperature of the valve  120  (e.g., within the sealing cavity  250 ) and/or the process chamber during a clean process (e.g., one or more clean process cycles) may be approximately 50-300 degrees Celsius, in some implementations. In other implementations, the operating temperature of the valve  120  and/or the process chamber during a clean process may be approximately 100-250 degrees Celsius. In other implementations, the operating temperature of the valve  120  and/or the process chamber during a clean process may be approximately 100-200 degrees Celsius. In another implementation, the operating temperature of the valve  120  and/or the process chamber during a clean process may be approximately 200 degrees Celsius. Still higher temperatures may be introduced in isolated areas of the isolation valve. 
       FIG. 1B  is a top view of a multi-station processing tool, wherein each processing station may include a corresponding RPC cleaning system configured to remove residue for interior surfaces of corresponding processing stations and/or process chambers, in accordance with one embodiment of the present disclosure. Some components of each RPC cleaning system may be shared between stations. For example, the RPC unit  112  may support one or more process chambers  102 . In one embodiment, RPC unit  112  may support one or more (e.g., four) plasma processing systems and/or stations. As shown, each plasma processing system includes a corresponding valve  120  (e.g., isolation valve) connected to the RPC unit  112 , wherein the isolation valve is configured to control flow of plasma (cleaning mixture) to the corresponding process chamber  102 . For example, the RPC unit  112  delivers plasma to process chamber  102 A via valve  120 A of a first station, delivers plasma to process chamber  102 B via valve  120 B of a second station, delivers plasma to process chamber  102 C via valve  120 C of a third station, and delivers plasma to process chamber  102 D via valve  120 D of a fourth station. 
       FIG. 2A  is a diagram of a valve system  200  configured to control (e.g., isolate) flow of a fluid  221 , in accordance with one embodiment of the present disclosure. The valve system  200  is includes valve  120  configured for controlling flow of fluid  221 . As shown in  FIG. 2A , the valve  120  is actuated to an open position using actuating air  215  from an air source  210 . In one embodiment, the actuating air is compressed dry air (CDA). When the valve  120  is in an open position, the actuating air continues to flow and cools the valve  120  during a clean operation, in accordance with one embodiment of the present disclosure. 
     The valve includes a valve body  127  configured for controlling flow of a fluid  221 . The valve body  127  includes a top cap  122  and a bottom cap  123 . A containing wall  121  connects the top cap  122  and the bottom cap  123 . 
     The valve  120  includes a sealing housing  127   b  of the valve body  127  configured for surrounding a sealing cavity  250 , which is located in the bottom portion of the valve. The sealing housing  127   b  includes a fluid inlet port  126  and a fluid outlet port  125 . Fluid inlet port  126  of the sealing housing  127   b  is located in containing wall  121  is configured for entry of the fluid  221  from the fluid source  225 . As previously described, fluid  221  is generated by fluid source  225  for distribution as controlled by valve  120 . Fluid outlet port  125  of the sealing housing  127   b  of the valve body  127  is located in bottom cap  123 . The fluid outlet port  125  is configured for delivery of fluid  221  to an intended target via the sealing cavity  250 . When the valve is in an open position, fluid  221  enters the sealing cavity  250  through fluid inlet port  126 , and exits through fluid outlet port  125  located in the bottom cap  123  for delivery to the target. 
     The valve body  127  includes an actuation housing  127   a  surrounding an actuation cavity  255 . The actuation housing  127   a  includes a common wall  124  separating the sealing cavity  250  from the actuation cavity  255 . The actuation housing  127   a  includes an opening (e.g., first opening)  265  in the common wall  124  that is configured to provide access between the sealing cavity  250  and the actuation cavity  255 . Further, actuation housing  127   a  includes another opening (e.g., second opening)  264  that is configured within the top cap  122 . In one embodiment, the stem  241  may extend from barrier  242  through opening  264 , for example during movement of the stem  241 . The second opening  264  is aligned with the first opening  265  for travel of stem  241  through openings  264  and  265 , in one embodiment. 
     Also, the actuating housing  127   a  includes a first port  261  configured for entry of actuating air, and a second port  263  configured for exhausting the actuating air. The first port is configured within the containing wall  121 , and is configured for entry of actuating air  215  delivered from the air source  210 , wherein actuating air  215  is used to move the valve  120  to the open position. In one embodiment, actuating air is CDA. The second port  263  (e.g., exhaust port) is located within the containing wall  121 , and is configured to allow actuating air  215  to exhaust from the actuation cavity  255  as air exhaust  275 . 
     The valve includes a poppet  240  configured for movement within the valve body  127 . In particular, poppet  240  includes a stem  241  configured for connecting a sealing plunger  243  to a barrier  242 . The stem  241  connects the sealing plunger  243  located within the sealing cavity  250  to the barrier  242  located within the actuation cavity  255  through a first opening  265  in the common wall  124 . The poppet  240  is actuated to an open position using the actuating air  215  entering in the first port  261 . 
     Specifically, the poppet  240  is configured for linear movement within the valve body  127 , as actuated by actuating air  215  provided by the air source  210 . In  FIG. 2A , the valve  120  is moved to an open position by actuating air  215 , as delivered to the first port  261  through the accommodating piping/delivery system for UP actuation. In particular, the barrier  242  is configured for linear movement within the actuation cavity  255 , as actuated by actuating air  215 . Linear movement of the barrier  242  is translated to linear movement of the sealing plunger  243  within the sealing cavity  250  via the stem  241 , wherein the stem  241  is configured for travel through the first opening  265 . 
     As shown in  FIG. 2A , when the valve  120  is in the open position, the barrier  242  is pushed and/or linearly moved towards top cap  122  by actuating air  215 , as will be further described in relation to  FIGS. 3A-3C . In that manner, sealing plunger  243  is linearly moved to rest against the common wall  121 . In one embodiment, the state of the valve  120  is maintained without continuous flow of actuation air. For example, the state of poppet  240  (e.g., open or closed position) within the valve body  127  remains static (e.g., through friction). As such, when the barrier  242  is similarly in the open position, the sealing plunger  243  is positioned to seal the first opening  265  from the sealing cavity  250 , and allow flow of fluid  221  through the sealing cavity  250  from the fluid inlet port  126  to the fluid outlet port  125 . More particularly, when the barrier  242  is similarly in the open position, actuating air  215  continues to flow through the actuation cavity  255  between the first port  261  and the second port  263  (e.g., exhaust port). In one embodiment, cooling flow  270  of the actuating air within the actuation cavity  255  cools the stem  241 . The cooling flow  270  may be controlled for optimal cooling, such as duration of cooling flow  270 , pressure of cooling flow  270 , start time of cooling flow  270 , end time of cooling flow  270 . Cooling of the stem  241  lowers the operating temperature of the poppet  240 , and more particularly lowers the temperature of the stem and components in contact with the stem  241 , such as sealing O-rings. 
     In one embodiment, the configuration of the first port  261  and the second port  263  (e.g., exhaust port) allows for full actuation of the valve  120  to the open position before fully exhausting the actuating air as air exhaust  275  through the second port  263 . If additional actuating air  215  is necessary to fully actuate the poppet  240  and/or valve  120  to the open position, timer  230  and exhaust logic  220  are configured to control the exhausting of the actuating air  215  to the atmosphere as air exhaust  275 . In particular, exhaust logic  220  may be configured as AND logic, with a first input being actuating air  215  from the air source  210  and a second input being the air exhaust  275  from the second port  263  (e.g., exhaust port). When the exhaust logic  220  receives both inputs as being true (i.e., receives both actuating air  215  and air exhaust  275 ), then the exhaust logic  220  opens to allow the air exhaust  275  to the atmosphere. On the other hand, when the exhaust logic  220  only receives one input as being true, then the exhaust logic  220  remains closed, and air exhaust  275  is preventing from exhausting to the atmosphere. 
     In one embodiment, a timer  230  (optional) controls the delivery of actuating air  215  from the air source  210  to the exhaust logic  220 . That is, timer  230  is configured to control cooling (e.g., start and end of cooling, the cooling period, etc.), and does not impede actuation. Timer  230  controls how long to prevent actuating air  215  from being received as an input to exhaust logic  220 . In one implementation, as long as the timer is activated and has not expired, actuation air  215  is prevented from flowing as input to exhaust logic  220 . In some implementations, even though the second port  263  is exposed to the actuation cavity  255  below the barrier  242  thereby allowing actuating air  215  to exhaust, when the exhaust logic  220  is closed to prevent air exhaust  275  to flow to atmosphere (e.g., channel leading to atmosphere is stagnant), the pressure under barrier  242  in cavity  255  is maintained at the pressure of actuating air presented to exhaust logic  220 . For example, it may be desired to allow for a longer period for actuating air  215  to actuate the poppet  240  to the fully open position. Also, it may be desired to delay cooling of the stem  241  by preventing actuating air  215  to exhaust to atmosphere through exhaust logic  220  (e.g., remains closed through operation of timer  230 ). Once the exhaust logic  220  opens, the actuating air  215  flows through the actuation cavity as cooling flow  270  to cool the stem  241 , exits as air exhaust  275 , and passes through the exhaust logic  220  to the atmosphere. In another embodiment, timer  230  controls delivery of air exhaust  275  from the air exhaust port  263 , instead of controlling actuating air  215  as input to the exhaust logic  220 . 
       FIG. 2B  is a diagram of valve system  200 ′ configured for controlling flow of fluid, wherein a valve is in a closed position, and wherein an actuating air flow cools the valve, in accordance with one embodiment of the present disclosure. The valve system  200 ′ shown in  FIG. 2B  is identical to the valve system  200  shown in  FIG. 4  with identical components; however, the valve in  FIG. 2B  is allowed to exhaust actuating air used for closing the valve to atmosphere thereby allowing cooling of the valve, as opposed to  FIG. 4  where the actuating air is prevented from exhausting to atmosphere. 
     In particular, the valve system  200 ′ of  FIG. 2B  includes valve  120  configured for controlling flow of fluid  221 . As shown, the valve  120  is actuated to a closed position using actuating air  215  from air source  210 . In one embodiment, the actuating air is compressed dry air (CDA). As shown in  FIG. 2B , when the valve  120  is in the closed position, actuating air  215  continues to flow and cool the valve  120 , even though fluid  221  is prevented from exiting valve  120 . More particularly, when the barrier  242  is similarly moved to the closed position, actuating air  215  continues to flow through the actuation cavity  255  between the third port  262  and the second port  263  (e.g., exhaust port) and exit the actuation cavity  255  as air exhaust  275 ′. In one embodiment, cooling flow  272  of the actuating air within the actuation cavity  255  cools the stem  241 . The cooling flow  272  may be controlled for optimal cooling, such as duration of cooling flow  272 , pressure of cooling flow  272 , start time of cooling flow  272 , end time of cooling flow  272 , temperature of cooling flow  272 , etc. Cooling of the stem  241  lowers the operating temperature of the valve  120 , and more particularly lowers the temperature of the stem of poppet  240  and components in contact with the stem  241 , such as sealing O-rings, the sealing housing  127   b,  the actuation housing  127   a,  etc. 
     In the configuration of  FIG. 2B , timer  230  controls the delivery of actuating air  215  from the air source  210  to the exhaust logic  220 . As previously described, exhaust logic  220  may be configured as AND logic, with a first input being actuating air  215  from the air source  210  and a second input being the air exhaust  275 ′ from the second port  263  (e.g., exhaust port). For example, if additional actuating air  215  is necessary to fully actuate the poppet  240  and correspondingly valve  120  to the closed position, timer  230  (optional) and exhaust logic  220  are configured to control the exhausting of the actuating air  215  to the atmosphere as air exhaust  275 ′. Timer  230  is configured to control cooling (e.g., start and end of cooling, the cooling period, etc.) of the valve  120  when moving to and when in a closed position, and does not impede actuation. Timer  230  controls how long to prevent actuating air  215  from being received as an input to exhaust logic  220 . In one implementation, as long as the timer is activated and has not expired, actuation air  215  is prevented from flowing as input to exhaust logic  220  when the valve  120  is moved to the closed position. As such, even though the second port  263  is exposed to the actuation cavity  255  above the barrier  242  thereby allowing actuating air  215  to exhaust, when the exhaust logic  220  is closed, air exhaust  275 ′ is still prevented from flowing to atmosphere (e.g., channel leading to atmosphere is stagnant). Because exhaust logic  220  remains closed, the actuating air  215  continues to fill the actuation cavity  255  and acts to push the barrier  242  towards the common wall  124 , thereby moving the poppet  240  to the closed position. That is, the pressure of the air exhaust  275 ′ and the actuating air  215  continues to actuate the poppet  240  to the closed position. For example, it may be desired to allow for a longer period for actuating air  215  to actuate the poppet  240  to the fully closed position. Also, it may be desired to delay cooling of the stem  241  by preventing actuating air  215  as air exhaust  275 ′ to exhaust to atmosphere through exhaust logic  220  (e.g., remains closed through operation of timer  230 ). Once the exhaust logic  220  opens, the actuating air  215  flows through the actuation cavity  255  as cooling flow  272  to cool the stem  241 , exits as air exhaust  275 ′, and passes through the exhaust logic  220  to the atmosphere. In another embodiment, timer  230  controls delivery of air exhaust  275 ′ from the air exhaust port  263 , instead of controlling actuating air  215  as input to the exhaust logic  220 . 
       FIGS. 3A-3C  are illustrations of the valve  120  shown in  FIG. 2A  as the valve is moving to an open position from a closed position, wherein the valve  120  controls flow of fluid  221 , in accordance with one embodiment of the present disclosure. In  FIG. 3A , the poppet  240  is in the closed position, such that stem  241  is linearly moved towards the bottom cap  123 . In that manner, the sealing plunger  243  is resting against the bottom cap  123 , and more particularly, O-ring  371  is in contact with both bottom cap  123  and the sealing plunger  243  to isolate the sealing cavity  250  from the exterior of valve  120 . To move the poppet  240  (and valve  120 ) to the open position, actuating air  215  is introduced into the actuation cavity  255  through first port  261 . As the actuating air  215  fills the space below barrier  242  in the actuation cavity  255 , pressure moves the barrier  242  linearly towards top cap  122 . In one embodiment, the actuating air  215  is CDA. In this implementation, as the actuating air fills the space below barrier  242  in the actuation cavity  255 , the barrier  242  is moved linearly towards top cap  122 . In one embodiment, in the closed position, actuating air  215  is not exhausted from the actuation cavity  255  as the second port  263  (e.g., exhaust port) is blocked from access by the position of the barrier  242 . 
     In one implementation, the estimated time to open the valve  120  from a closed position is approximately 0.2 to 45 seconds. In another implementation, the estimated time to open the valve ranges between about 1 to 30 seconds. In another implementation, the estimated time to open the valve ranges between about 0.2 to 30 seconds. In another implementation, the estimated time to open the valve ranges between about 0.2 to 10 seconds. In other implementations, the estimated time to open the valve ranges between about 0.2 to 5 seconds. In another implementation, the estimated time to open the valve ranges between about 0.5 to 3 seconds. In one implementation, the estimated time to open the valve is approximately 2 seconds. 
     In  FIG. 3B , the poppet  240  has moved to an intermediate position between a closed position and an open position. In particular, barrier  242  is being linearly moved away from common wall  124 . Residual air remaining in the space of the actuating cavity  255  above barrier  242  may exhaust through a third port  262 . In addition, sealing plunger  243  is being linearly moved away from bottom cap  123 . As such, some flow of fluid  221  is able to flow from fluid inlet port  126  through sealing cavity  250  and out from fluid outlet port  125 . As shown, actuating air  215  is still not being exhausted from the actuation cavity  255  as the second port  263  (e.g., exhaust port) continues to be blocked from access by the position of the barrier  242 . In one embodiment, the configuration of the first port  261  and the second exhaust port  263  allows for full actuation of the valve  120  to the open position before fully exhausting actuating air  215  through second port  263  as air exhaust  275 . 
     In  FIG. 3C , the poppet  240  has moved to the fully open position, such as when the valve  120  is actuated UP. In particular, barrier  242  has been linearly moved away from common wall  124 . In addition, sealing plunger  243  has been linearly moved away from bottom cap  123 , and is resting against common wall  124 . Specifically, O-ring  372  is in contact with both sealing plunger  243  and common wall  124 , such that the sealing cavity  250  is now isolated from actuation cavity  255 . That is, O-ring  372  seals opening  265  from the sealing cavity  250  when the poppet  240  is in the open position. O-ring  372  may be configured on an upper surface of the sealing plunger  243 . In that manner, fluid  221  is prevented from entering into the actuation cavity  255  when the poppet and valve are in the open position. As such, when the valve  120  is in the fully open position, fluid  221  flows from fluid inlet port  126  through sealing cavity  250  and out from fluid outlet port  125  without restriction. 
     Additionally, actuating air  215  is now being exhausted from the actuation cavity  255  as the second port  263  (e.g., exhaust port) is now accessible, being located below the barrier  242 . That is, the space of the actuation cavity  255  below barrier  242  is accessible by the second port  263 . As previously described, full actuation of the valve  120  is performed before fully exhausting actuating air through second port  263  as air exhaust  275 . As shown air exhaust  275  exits exhaust port  263 . In one embodiment, when valve  120  is in the open position actuating air  215  continues to flow into the actuation cavity  255 . Because actuating air  215  can be exhausted through second port  263  (e.g., exhaust port) as air exhaust  275 , a cooling flow  270  is generated and can be used to cool the stem  241 . In particular, the stem  241  of the poppet  240  acts as a heat sink. The surface area of the stem allows for heat dissipation, wherein heat is transferred from the stem  241  to the cooling flow  270  (e.g., through convection). In that manner, the temperature of stem  241  can be controlled by controlling the flow of the actuating air  215  in cooling flow  270 . The flow of actuating air  215  can be controlled by controlling the exhausting pressure of the air. In addition, the period of cooling can be controlled through controlling the delivery of actuating air  215 , during actuation and/or after full actuation of the valve  120 , such as with timer  230 . 
     In one embodiment, the actuating air  215  as CDA flows into the actuation cavity  255  and expands. Cooling of the actuating CDA may occur during expansion. Generally, and for purposes of simplicity and clarity, the expansion of actuating CDA lowers its temperature as it enters the actuation cavity  255  from first port  261 . As the now expanded actuating CDA flows past stem  241  (e.g., acting as a heat sink), convection acts to transfer heat between the stem  241  and the cooling flow  270  of the actuating air or actuating CDA, before the actuating air or actuating CDA is exhausted from the actuation cavity  255  as air exhaust  275  to the atmosphere. In that manner, the temperature of stem  241  can be controlled by controlling the flow of the actuating air or actuating CDA in cooling flow  270 , as described above. For example, the flow of actuating air or actuating CDA can be controlled by controlling the exhausting pressure of actuating air or actuating CDA, or by controlling the period of cooling through timer  230 . 
     In one embodiment, the cooling of the stem  241  also leads to additional cooling of additional components in contact with the stem. For example, the operating temperature of O-ring  372  is reduced as it becomes cooled through cooling of stem  241 . As shown, cooling of stem  241  leads to localized cooling of the sealing plunger  243  and O-ring  372 , as well as O-ring  371 . In addition, the operating temperature of the actuation housing  127   a  surrounding the actuation cavity  255  and/or the sealing housing  127   b  surrounding the sealing cavity  250  also becomes cooled through cooling of the stem  241 , thereby leading to lower operating temperatures. 
       FIG. 4  is a diagram of a valve system  200  configured to control fluid flow, wherein valve  120  is configured in a closed position, in accordance with one embodiment of the present disclosure. The valve system  200  shown in  FIG. 4  is identical to the valve system  200  shown in  FIG. 2A  with identical components. As such, a full discussion of the components of the valve system  200  may be found in relation to  FIG. 2A . The difference between the valve systems  200  in  FIGS. 2A and 4  is the state of the valve, wherein the valve  120  is shown in an open position in  FIG. 2A , and the valve is shown in a closed position in  FIG. 4 . 
     In particular, the valve system  200  includes valve  120  configured for controlling flow of fluid  221 . As shown in  FIG. 4 , the valve  120  is actuated to a closed position using actuating air  215  from air source  210 . In one embodiment, the actuating air is compressed dry air (CDA). As shown in  FIG. 4 , in the closed position, actuating air  215  is prevented from exhausting from the actuation chamber  127   a,  and as such does not act to cool the valve  120 , and more particularly the stem  241 . 
     As previously described, the valve includes a valve body  127  configured for controlling flow of fluid  221 . A sealing housing  127   b  of the valve body  127  is configured for surrounding sealing cavity  250 , and includes fluid inlet port  126  configured for entry of the fluid  221  and an fluid outlet port  125  configured for allowing exit of fluid from the sealing cavity  250 . 
     The valve body  127  includes an actuation housing  127   a  surrounding actuation cavity  255 . As previously described, actuation housing  127   a  includes common wall  124  separating the sealing cavity  250  from the actuation cavity  255 , wherein opening  265  is located in the common wall  124 . Opening  264  is configured within top cap  122  and is aligned with opening  265  in common wall  124  to facilitate travel of stem  241  of the poppet  240  through openings  264  and  265 . Actuation housing  127   a  includes a third port  262  configured for entry of actuating air  215  used to move the poppet  240  to the closed position. As shown, the third port  262  is configured within the containing wall  121 , and is configured for entry of actuating air  215  delivered from the air source  210 . In one embodiment, actuating air is CDA. The second port  263  (e.g., exhaust port) is located within the containing wall  121 , and is configured to allow actuating air  215  to exhaust from the actuation cavity  255  as air exhaust  275 ′. 
     The valve includes a poppet  240  configured for movement within the valve body  127 . The poppet  240  is actuated to the closed position using the actuating air  215  entering in the third port  262 , as delivered through accommodating piping/delivery system for DOWN actuation. In particular, when the valve  120  is in the closed position, the barrier  242  is pushed and/or linearly moved towards bottom cap  123  by actuating air  215 , as will be further described in relation to  FIGS. 5A-5B, and 5C-1 . In one embodiment, the state of the valve  120  is maintained without continuous flow of actuation air. For example, the state of poppet  240  (e.g., open or closed position) within the valve body  127  remains static (e.g., through friction). As such, when barrier  242  is moved to the closed position, sealing plunger  243  is linearly moved to rest against the bottom cap  123 , such that that the sealing plunger is positioned and configured to seal the fluid outlet port  125  from the sealing cavity  250  and prevent flow of fluid  221  through the sealing cavity  250  to exit from the fluid outlet port  125 . O-ring  371  is configured on a lower surface of the sealing plunger  243 , wherein the O-ring  371  is configured for sealing the RPC outlet port from the sealing cavity when the barrier is actuated to the closed position. That is, when barrier  242  is moved to the closed position O-ring  371  is in contact with both the bottom cap  123  and the sealing plunger  243 , wherein the positioning of the O-ring  371  is such that the fluid outlet port  125  is sealed from the sealing cavity  250 , thereby preventing flow of fluid  221  through the valve. 
     In one embodiment, actuating air  215  is prevented from exhausting to atmosphere, and as such, actuating air  215  does not act to cool the stem  241  and/or the valve  120 . In one embodiment, the configuration of the third port  262  and the second port  263  (e.g., exhaust port) allows for full actuation of the valve  120  to the closed position. If additional actuating air  215  is necessary to fully actuate the poppet  240  and correspondingly valve  120  to the closed position, timer  230  (optional) and exhaust logic  220  are configured to control the exhausting of the actuating air  215  to the atmosphere as air exhaust  275 ′. In particular, exhaust logic  220  may be configured as AND logic, with a first input being actuating air  215  from the air source  210  and a second input being the air exhaust  275 ′ from the second port  263  (e.g., exhaust port). As shown in  FIG. 4 , the first input to the timer  230  is blocked, thereby preventing exhaust logic  220  from opening and preventing air exhaust  275 ′ from escaping to the atmosphere. That is, actuating air  215  provided for actuation-down is inactive as an input to the exhaust logic  220 , and as such the passing of air exhaust  275 ′ through the exhaust logic  220  is blocked. Even if the timer  230  were in operation, no input of actuating air  215  would be provided to the exhaust logic  220  in the configuration of  FIG. 4  when the poppet  240  is moved to and remains in a closed position. When the exhaust logic  220  receives both inputs as being true (i.e., receives both actuating air  215  and air exhaust  275 ′), then the exhaust logic  220  opens to allow the air exhaust  275 ′ to the atmosphere. Because exhaust logic  220  remains closed, the actuating air  215  continues to fill the actuation cavity  255  and acts to push the barrier  242  towards the common wall  124 , thereby moving the poppet  240  to the closed position. 
       FIGS. 5A-5B, 5C-1, and 5C-2  are illustrations of the valve  120  shown in  FIGS. 2B and 4  as the valve is moving to a closed position from an open position, wherein the valve  120  controls flow of fluid  221 , in accordance with one embodiment of the present disclosure. 
     In one implementation, the estimated time to close the valve from a closed position is approximately 0.2 to 45 seconds. In another implementation, the estimated time to close the valve ranges between about 1 to 30 seconds. In another implementation, the estimated time to close the valve ranges between about 0.2 to 30 seconds. In another implementation, the estimated time to close the valve ranges between about 0.2 to 10 seconds. In other implementations, the estimated time to close the valve ranges between about 0.2 to 5 seconds. In another implementation, the estimated time to close the valve ranges between about 0.5 to 3 seconds. In one implementation, the estimated time to close the valve is approximately 2 seconds. 
     In  FIG. 5A , the poppet  240  is in the open position, such that stem  241  is linearly moved towards the top cap  122 . In that manner, the sealing plunger  243  is resting against the common wall  124 , and more particularly, O-ring  372  is in contact with both common wall  124  and the sealing plunger  243  to isolate the sealing cavity  250  from the actuation cavity  255 . In that manner, fluid  221  is prevented from entering into the actuation cavity  255 . When the valve  120  is in the fully open position, fluid  221  flows from fluid inlet port  126  through sealing cavity  250  and out from fluid outlet port  125  without restriction. To move the poppet  240  (and valve  120 ) to the closed position, actuating air  215  is introduced into the actuation cavity  255  through third port  262 . As the actuating air  215  fills the space above barrier  242  in the actuation cavity  255 , pressure moves the barrier  242  linearly towards common wall  124 . In one embodiment, the actuating air  215  is CDA. In this implementation, as the actuating air fills the space above barrier  242  in the actuation cavity  255 , the barrier  242  is moved linearly towards common wall  124 . In one embodiment, in the open position, actuating air  215  entering from the third port  262  is not exhausted from the actuation cavity  255  as the second port  263  (e.g., exhaust port) is blocked from access by the position of the barrier  242 . 
     In  FIG. 5B , the poppet  240  has moved to an intermediate position between a closed position and an open position. In particular, barrier  242  is being linearly moved towards common wall  124 . Residual air remaining in the space of the actuating cavity  255  below barrier  242  may exhaust through the first port  261 . In addition, sealing plunger  243  is being linearly moved towards bottom cap  123 . As such, some flow of fluid  221  is able to flow from fluid inlet port  126  through sealing cavity  250  and out from fluid outlet port  125 . As shown, actuating air  215  entering from the third port  262  is still not being exhausted from the actuation cavity  255  as the second port  263  (e.g., exhaust port) continues to be blocked from access by the position of the barrier  242 . In one embodiment, the configuration of the first port  261  and the second exhaust port  263  allows for full actuation of the valve  120  to the closed position before fully exhausting actuating air  215  through second port  263  as air exhaust  275 ′. In other embodiments, a timer  230  (optional) is used to control actuation of the valve  120  to the closed position, and/or to control cooling of the valve  120  using actuating air  215 . 
     In  FIGS. 5C-1 and 5C-2 , the poppet  240  has moved to the fully closed position, such as when the valve  120  is actuated DOWN. In particular, barrier  242  has been linearly moved towards common wall  124 . In addition, sealing plunger  243  is resting against bottom cap  123 . Specifically, O-ring  371  is in contact with both sealing plunger  243  and bottom cap  123 , such that the sealing cavity  250  is now isolated from fluid outlet port  125 . In that manner, fluid  221  is prevented from flowing out from the fluid outlet port  125  when the valve  120  is in the fully closed position. 
     In  FIG. 5C-1 , actuating air  215  is prevented from exhausting to the atmosphere even after the valve  120  is fully actuated to a closed position.  FIG. 5C-1  corresponds to  FIG. 4 . For example, exhaust logic  220  remains closed, as previously described. Because actuating air  215  is prevented from being exhausted, no cooling flow is generated. 
     In  FIG. 5C-2 , actuating air  215  exhausts to the atmosphere even after the valve  120  is fully actuated to a closed position. For example, exhaust logic  220  is now open, as previously described. Because actuating air  215  is being exhausted, cooling flow is generated. In particular, actuating air  215  entering from third port  262  is now being exhausted from the actuation cavity  255  as the second port  263  (e.g., exhaust port) is now accessible, being located above the barrier  242 . That is, the space of the actuation cavity  255  above barrier  242  is accessible by the second port  263 . As shown air exhaust  275 ′ exits exhaust port  263 . In one embodiment, when the valve  120  is in the closed position actuating air  215  continues to flow into the actuation cavity  255 . Because actuating air  215  can be exhausted through second port  263  (e.g., exhaust port) as air exhaust  275 ′, a cooling flow  272  is generated and can be used to cool the stem  241 . In particular, heat is transferred from the stem  241  to the cooling flow  272 . As such, the temperature of stem  241  can be controlled by controlling the flow of the actuating air  215  in cooling flow  272 . The flow of actuating air  215  can be controlled by controlling the exhaust pressure of the air. In addition, the period of cooling can be controlled through controlling the delivery of actuating air  215 , during actuation and/or after full actuation of the valve  120 , such as with timer  230 . In one embodiment, the actuating air  215  is CDA, which cools upon expansion into the actuation cavity  255 , as previously described. As the now expanded actuating air flows past stem  241  (acting as a heat sink), convection acts to transfer heat between the stem  241  and the cooling flow  270  of the actuating CDA, before the actuating CDA is exhausted from the actuation cavity  255  as air exhaust  275  to the atmosphere. 
     In one embodiment, the cooling of the stem  241  also leads to additional cooling of additional components in contact with the stem. For example, the operating temperature of O-ring  372  is reduced as it becomes cooled through cooling of stem  241 . As shown, cooling of stem  241  leads to localized cooling of the sealing plunger  243  and O-ring  372 , as well as O-ring  371 . In addition, the operating temperature of the actuation housing  127   a  surrounding the actuation cavity  255  and/or the sealing housing  127   b  surrounding the sealing cavity  250  also becomes cooled through cooling of the stem  241 , thereby leading to lower operating temperatures. 
       FIG. 6  is a cut-away view from a top of a first configuration of valve  120  configured for controlling flow of fluid, wherein in an open and or closed position of the valve  120 , actuating air that is exhausted through the second port  263  (e.g., exhaust port) cools the interior of the valve  120 , in accordance with one embodiment of the present disclosure. For example, cooling flow  270  transfers heat from the stem  241  of the poppet  240  of the valve to the actuating air  215  before being exhausted from the actuation cavity  255  through the second port  263  as air exhaust  275 . As shown in  FIG. 6 , the containing wall  121  of the valve body  127  is cylindrical (e.g., circular) in shape, in one embodiment. 
       FIG. 7  is a flow diagram illustrating a method for operating a valve controlling fluid flow, in accordance with one embodiment of the present disclosure. In particular, the method may include cooling the valve using actuating air. The method of flow diagram  700  may be applied by the plasma processing modules  100  of  FIG. 1A , and the systems described in  FIGS. 2A-2B, and 4 . 
     At  710 , the method includes providing actuating air to a first port of an actuation housing of a valve body of a valve. The valve body includes an actuation housing surrounding an actuation cavity. A poppet is configured for movement within the valve body and includes a barrier located within the actuation cavity. 
     At  720 , the method includes actuating the poppet and correspondingly the valve to an open position using the actuating air entering the first port. For instance, the barrier of the poppet is actuated by actuating air to the open position, wherein the actuating air enters from the first port in the valve body. The barrier is configured for linear movement within the actuation cavity. 
     At  730 , the method includes exhausting the actuating air entering from the first port to atmosphere through a second port of the actuation housing when the poppet is in the open position. 
     At  740 , the method includes cooling the stem using actuating air flowing between the first port and a second port of the actuation housing. In particular, as the actuating air is exhausted, a cooling flow is generated within the actuation cavity that acts to cool the stem of the poppet. That is, when the valve is in the open position, cooling of the stem is performed by flowing the actuating air through the actuation cavity between the first port and the second port of the actuation housing. 
     In one embodiment, the method includes providing fluid to an inlet port of a sealing housing of the valve body, the sealing housing surrounding a sealing cavity. The valve body being configured for controlling flow of the fluid. The inlet port is configured for entry of the fluid into the sealing housing. In one embodiment, the fluid is RPC, such as a cleaning mixture. The sealing housing also includes an outlet port configured for exit of the fluid from the sealing cavity. A common wall of the sealing housing and the actuation housing separates the sealing cavity from the actuation cavity. In addition, the stem of the poppet connects a sealing plunger located within the sealing cavity to the barrier located within the actuation cavity through a first opening in the common wall. When being actuated, linear movement of the barrier of the poppet is translated to linear movement of the sealing plunger within the sealing cavity via the stem that is configured for travel through the first opening. When the poppet and correspondingly the valve are in the open position, the method includes positioning the sealing plunger to seal the first opening from the sealing cavity and allow flow of fluid through the sealing cavity from the inlet port to the outlet port. 
     In one embodiment, the cooling of the stem is delayed. For example, cooling is delayed to ensure full actuation of the barrier of the poppet and correspondingly the valve to the open position. In another embodiment, control over the cooling process is performed by controlling the exhaust of the actuation air from the actuation cavity to atmosphere. As such, even though the valve is fully actuated to an open position, cooling may be further delayed by a desired period. 
     In one embodiment, cooling of the stem occurs when the valve is in a closed position. That is, when the fluid is prevented from exiting the valve, additional cooling of the valve is performed. In particular, the method includes actuating the barrier of the poppet to a closed position using the actuating air. The actuating air enters from a third port in the valve body. The barrier is configured for linear movement within the actuation cavity, wherein linear movement of the barrier is translated to linear movement of the sealing plunger within the sealing cavity via the stem configured for travel through the first opening. As such, when the valve is in the closed position the method includes positioning the sealing plunger to seal the outlet port from the sealing cavity and prevent flow of fluid through the sealing cavity to the outlet port. The method includes exhausting the actuating air entering in from the third port to atmosphere through a second port of the actuation housing when the poppet is in the closed position. The method includes cooling the stem by flowing the actuating air through the actuation cavity between the third port and the second port of the actuation housing when the valve is in the closed position. That is, the valve can be configured to cool the stem in the open and/or closed position as needed. 
     The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure. 
     Although the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be apparent that certain changes and modifications can be practiced within the scope of the appended claims. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the embodiments are not to be limited to the details given herein, but may be modified within their scope and equivalents of the claims.