Abstract:
A safety valve device as for use with a compressed gas cylinder and/or a control valve comprising a housing unit, a plug with controlled bleed off channels bored into the plug, an actuator, and an actuating rod, which is designed to engage in the event that a control valve is severed from a compressed gas cylinder, at least partially sealing the opening formed in the compressed gas cylinder from the severing of the control valve, and achieving a safer, controlled bleed off of the compressed gas contained therein.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Patent Application No. 61/817,391 filed on Apr. 30, 2013. The disclosures of the referenced application are hereby incorporated herein in their entirety by reference. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not Applicable. 
     REFERENCE TO A “SEQUENCE LISTING,” A TABLE, OR A COMPUTER PROGRAM 
     Not Applicable. 
     BACKGROUND 
     Compressed gas cylinders and tanks are normally equipped with an access or control valve which regulates the flow of the compressed gas leaving the cylinder or tank. Conventionally, this access or control valve is axially connected to one end of the cylinder or tank at an access port. If the tank were to fall, get knocked over, or otherwise cause the valve to come into contact with an external force, the valve may be broken off, ruptured, or otherwise separated from the tank at the point of connection. The pressure of the uncontrolled gas venting from the tank as a result of such separations creates a great hazard. 
     For example, if the neck of a pressurized cylinder should be accidentally broken off, the energy released may be sufficient to propel the cylinder in the fashion of a torpedo or other projectile. It is estimated that a standard 250 cubic foot cylinder pressurized to 2,500 PSIG can become a rocket attaining a speed of over 30 miles per hour in a fraction of a second after venting from the broken cylinder connection. It is further estimated that an 80 cubic foot cylinder filled to 3000 psi (207 bar) has in excess of one million pounds of kinetic energy; power sufficient to blow apart brick walls, destroy vehicles, and injure or kill people. 
     In addition to the torpedo or projectile hazard, compressed gas cylinders are also known to topple over and laterally spin in circles when the control valve is ruptured from a tank. This presents an additional hazard as the spinning cylinder could potentially knock a standing person off his or her feet, and continue to barrage or forcefully contact that person causing grave injury. For example, a human user may accidentally knock over a compressed gas cylinder during use by accidentally pulling too hard on a gas tube connected to the control valve of the cylinder. While falling over, the compressed gas cylinder control valve may come into contact with a work bench or other external force, causing the valve to separate from the cylinder. At this point in time, the highly compressed gas will vent from the cylinder at a high pressure and rate, causing the cylinder to start spinning. Because these events can occur in a matter of seconds, the human user may not have the ability to react quickly enough to remove himself from the circular path of the cylinder&#39;s spinning. Thus, the user&#39;s feet could be taken out from underneath the user, causing the user to fall over and sustain injury. It is further possible that the user may fall into the path of the spinning cylinder and incur even more grievous injuries. 
     Many attempts have been noted which aim to solve the “torpedoing” and “spinning” issues mentioned above. However, to do so, the prior art attempts essentially utilize plugs to completely stop the venting of gas from the cylinder. The reality is that the “solution” proposed by the prior art actually produces an additional, novel problem by creating a plugged compressed gas cylinder which lacks a controllable valve to release the pressurized gas therein. A person having ordinary skill in the art would recognize that a compressed gas cylinder without a controllable release valve is potentially a greater hazard than is the torpedoing cylinder and may even liken such a tank to a bomb, or bomb-in-waiting. The present invention seeks to address and provide a solution for all three of these issues. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       The drawings constitute a part of this specification and include exemplary embodiments of the safety valve device, which may be embodied in various forms. It is to be understood that in some instances, various aspects of the safety valve device may be shown exaggerated or enlarged to facilitate an understanding of the device. Therefore the drawings may not be to scale. 
         FIG. 1  is a drawing depicting an embodiment of the safety valve device connected to a primary compressed gas tank valve and coupled to a mixing gas tube adapter. 
         FIG. 2  is an exploded view depicting the component parts of one embodiment of the safety valve device. 
         FIG. 3  is a cross sectional view of one embodiment of the safety valve device with the plug in an inactivated position. 
         FIG. 4  is a cross sectional view of the same embodiment of the safety valve device as is depicted in  FIG. 3  with the plug in an activated position, creating a controlled bleed off of the compressed gas tank&#39;s contents. 
         FIG. 5  is a cross sectional view of one embodiment of the safety valve device depicting another embodiment of a plug which is in an inactivated position. 
         FIG. 6  depicts an external side view of the housing unit attached to a cap. 
     
    
    
     DISCLOSURE 
     The disclosed safety valve device aims to solve the aforementioned safety issues regarding compressed gas tanks. To solve these issues, multiple embodiments of a safety valve device are provided which allows for a controlled bleed off of the contents of a compressed gas tank in the event that an access valve is separated from the tank, causing a breach in the tank. In one embodiment, a safety valve device is provided comprising a housing structure, a plug, a spring, and an actuating rod, wherein at least one controlled bleed off vein is bored into the plug. As used herein, the term “controlled bleed off” means a decrease in the flow rate of an output stream from a tank as compared to an uninhibited flow rate. As used herein, the term “output stream” refers to the stream of movement of the tank&#39;s gaseous contents to the ambient atmosphere through an access port in the tank. As used herein, the term “controlled bleed off vein” is defined to mean a channel bored into or otherwise formed in the plug in such a manner as to act as a conduit between the interior of a compressed gas tank and the ambient atmosphere which facilitates a controlled bleed off when the plug is in the activated position. As used herein, the term “controlled bleed off channel” means the channel or conduit formed between the interior of a tank and the ambient atmosphere which facilitates a controlled bleed off of the output stream. As used herein, the term “plug” means a device or object which is capable of forming at least a partial seal when in the “activated position” so as to facilitate a controlled bleed off of the output stream. As used herein, the term “activated position” refers to the position of the plug valve when the plug is forming at least a partial seal with an opening or passageway through which the output stream could exit the tank which facilitates or achieves a controlled bleed off of the output stream. As used herein, the term “inactivated position” refers to the position of the plug valve when the plug does not substantially restrict the flow of the output stream by forming a partial seal. As used herein the term “compressed gas tank” refers to any canister, cylinder, tank, or other housing means for storing a gas at a pressure differential to the ambient atmosphere. As used herein the term “access port” in reference to a compressed gas tank refers to any breach, opening, or port in the structure of the compressed gas tank through which an output stream could flow. 
     Having reviewed the contents of this specification, one having ordinary skill in the art would recognize that multiple configurations of controlled bleed off veins and controlled bleed off channels could be utilized to facilitate an intended rate of a controlled bleed off. In one of the most basic embodiments, the safety valve device comprises a housing unit, a plug, an actuator, and an actuating rod, wherein the plug is capable of forming at least a partial seal with the housing unit and comprises at least one controlled bleed off vein. Various embodiments of the safety valve device allow for the use or mechanical and non-mechanical actuators which shift the plug into the activated position when a controlled bleed off is desired, such as when the valve is separated from the tank and/or housing unit. The output stream passing through the housing unit could act as an actuator if the pressure exerted on the plug by the stream is sufficient to move the plug to the activated position. However, mechanical actuators, such as springs, provide additional fail-safe&#39;s which ensure that the plug enters the activated position. Therefore, in another embodiment, the safety valve device comprises a housing unit, a plug, a mechanical actuator such as a spring, and an actuating rod, wherein the plug is capable of forming at least a partial seal with the housing unit and comprises at least one controlled bleed off vein, and wherein a controlled bleed off channel is formed when the plug is in the activated position. In at least one embodiment, the housing unit is housed inside the compressed gas tank during operation. 
     In another embodiment, the safety valve device comprises a housing unit, a plug, a spring, and an actuating rod, wherein the plug comprises at least one controlled bleed off vein, wherein the plug contacts the spring, and wherein the plug, spring, and a portion of the actuating rod are housed inside the housing unit when the plug is in the inactivated position. The housing unit has at least one inlet port and an outlet or output port which allows the output stream to pass through the housing unit. The actuating rod has two ends wherein one end is housed inside an access valve attached to a compressed gas tank and contacts or abuts a valve seat located inside of the access valve and the other end is housed inside the housing unit and contacts the plug either directly or indirectly when the plug is inactivated. The spring exerts a force which pushes the plug towards the activated position. During normal use, the valve is connected to the tank and contact between the valve seat and the actuating rod counters or resists the force from the actuator which pushes the plug to the activated position. If the valve and valve seat were severed or otherwise sufficiently separated from the tank and housing unit, the actuating rod and valve seat would cease to counter the force exerted by the actuator, and the plug would shift to the activated position allowing for a controlled bleed off of the tank&#39;s contents to be achieved. In yet an additional embodiment, the housing unit further comprises a housing unit output shoulder, wherein the plug contacts and forms at least a partial seal with the housing unit output shoulder when the plug is in the activated position. 
     In one embodiment, a housing unit is provided comprising a gas channel, at least one intake, an outlet, and a platform with a cross section across the outlet upon which the spring can rest such that it is capable of exerting a force on the plug to activate the plug. In a related embodiment, the platform is in the shape of a cross. In another embodiment, the housing unit comprises a body, a bottom intake, a top outlet, at least one side intake, and a platform, wherein the platform has a cross section upon which the spring can rest such that it is capable of exerting a force on the plug to activate the plug and wherein the platform is capable of allowing the contents of the tank to pass there through. In another embodiment, the housing unit comprises a body, at least one intake, an outlet, and a platform upon which the spring can rest such that it is capable of exerting a force on the plug towards the activated position, wherein the platform is provided by a cap which is attached to the bottom of the housing unit. In another embodiment, the cap has an intake hole which allows for the flow of the tank&#39;s contents through the cap and into the housing unit. 
     In one embodiment, the housing unit is diametrically smaller than the valve slot on the tank to allow for the housing unit to allow for easier installation or removal of the housing unit. In one embodiment, the housing unit is diametrically larger than the width or diameter of each of the plug, spring and actuating rod. In one embodiment, the housing unit comprises an attachment means which allows for the housing unit to attach to a compressed gas tank. In a further embodiment, the housing unit comprises an attachment means which allows for the housing unit to attach to a control valve. In one embodiment, one or more of the housing unit attaching means comes in the form of threading. In another embodiment, the housing unit is externally threaded on one end to allow for connection to an internally threaded valve. In another embodiment, the housing unit is externally threaded on one end to allow for connection of the housing unit to the internal threading of a tank&#39;s valve slot. In yet another embodiment, the housing unit is externally threaded on one end to allow for the connection of the housing unit to both a tank and a control valve. In yet another embodiment, the housing unit is threaded on one end to allow for the connection of a cap. In yet another embodiment, the housing unit is externally threaded to allow for the connection of an adapter which has corresponding internal threading. In one embodiment, the adapter is a gas mixing tube adapter and the gas mixing tube adapter is structured so as to allow for a gas mixing tube to be connected to the housing unit through the gas mixing tube adapter. In yet another embodiment, the housing unit is externally threaded to allow for the direct connection of a mixing tube to the housing unit. 
     Multiple configurations of attachment means are envisioned for the safety valve device, depending on various factors including the tanks, valves or various adapters with which the device is to be used. In one embodiment, the housing unit comprises a top threading, a middle threading, and a bottom threading. In another embodiment, the housing unit comprises an external threading on one end of the housing unit and an external threading located between the ends of the housing unit. In another embodiment, the housing unit comprises a top external threading, a middle threading, and a bottom threading. In a related embodiment, the bottom threading is an external threading which allows for the attachment of a cap with corresponding internal threading. In a related embodiment, the bottom threading is an internal threading which is used to attach a cap with corresponding external threading to the housing unit. 
     In one embodiment, the safety valve device comprises a housing unit, a rod, a plug, and a spring, the housing unit is a tubular housing unit, the plug is a ball valve, the plug comprises at least one controlled bleed off vein bored or otherwise formed into the plug such that at least one controlled bleed off channel is formed when the plug is in the activated position, the actuating rod is a metallic pin, and the spring is a compression spring. In one embodiment, the housing unit comprises a gas channel, at least one intake, an outlet, and a platform with a cross section upon which the spring can rest such that it is capable of exerting a force on the plug to activate the plug. In a related embodiment, the platform is in the shape of a cross which allows for at least one opening through which gas can enter the housing unit from the tank. In another embodiment, the housing unit comprises a body, a bottom intake, a top outlet, at least one side intake, and a platform, wherein the platform has a cross section upon which the spring can rest such that it is capable of exerting a force on the plug to activate the plug and wherein the platform is capable of allowing the contents of the tank to pass there through. In another embodiment, the housing unit comprises a body, at least one intake, an outlet, and a platform upon which the spring can rest such that it is capable of exerting a force on the plug to activate the plug, wherein the platform is provided by a cap which is attached to the bottom of the housing unit. In another embodiment, the cap has an intake hole which allows for the flow of the tank&#39;s contents through the cap and into the housing unit. 
     In one embodiment, the housing unit is a tubular housing unit, the plug is a ball valve, at least one controlled bleed off vein is bored into the plug such that at least one controlled bleed off channel is formed when the plug is activated, the actuating rod is a metallic pin, and the spring is a compression spring. 
     Multiple embodiments of the safety valve device are provided herein. It should be understood that no limitations on the scope of the invention are intended by describing these embodiments. One of ordinary skill in the art will readily appreciate that alternate but functionally equivalent components, materials, designs, and equipment may be used. One of ordinary skill in the art will likewise readily appreciate that various components of the multiple embodiments described herein could be used together to create a different embodiment from those which are described. The inclusion of additional elements may be deemed readily apparent and obvious to one of ordinary skill in the art. Specific elements disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one of ordinary skill in the art to employ the present invention. The term actuating rod should likewise not be used to limit the scope of the invention. As described herein, the actuating properties of the actuating rod demonstrate that the absence of the opposing or resisting force exerted by the presence of the primary valve onto the plug through the actuating rod to counter the opposing force of the spring exerted onto the plug allows for the plug to be moved to the activated position. Therefore, the term activating rod could be switched to a stopper rod or stopper pin without changing the scope of the safety valve device. 
     DETAILED DESCRIPTION 
     The subject matter of the present invention is described with specificity herein to meet statutory requirements. However, the description itself is not intended to necessarily limit the scope of claims. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided, such as examples of plugs, housing units, actuating rods, valves and component materials. One skilled in the relevant art will recognize, however, that the safety valve device may be practiced without one or more of the specific details, or with other components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention. 
     The Depicted Parts 
     As shown in the exploded perspective view of  FIG. 2 , one embodiment of the safety valve device comprises a housing unit  20 , a plug  30 , an actuator spring  40 , and an actuating rod  50 , wherein, during normal operations, actuating rod  50  extends from the valve seat  2  inside the primary valve  1  into housing unit  20 . The actuating rod  50  contacts plug  30  when plug  30  is in the inactivated position. The safety valve device can be fitted to couple with many types and sizes of compressed gas tanks and associated valves, thereby creating a gas regulation system. The typical tank valves represented by primary valve  1  utilize a valve nut  4  to open and close the valve chamber passageway, thereby regulating the flow of gas. The user manipulates the valve handle  3 , causing valve nut  4  to open and close the valve channel passageway. The base of valve nut  4  facing the tank opening is valve seat  4  which contacts actuating rod  50  during normal operation. 
     Housing unit  20  provides the general structure for the safety valve device and houses a majority of the components which allow the safety valve device to function. Housing unit  20  generally comprises a housing unit gas channel  21 , a securing means to compressed gas tank and primary valve  22 , gas output port  23 , at least one gas intake from compressed gas tank port (depicted as  24 ,  26 , or both  24  and  26 ), housing unit output shoulder  25 , and optional other securing means which allow for the attachment of the housing unit to various other components such as a gas mixing tube adapter  70  and a housing unit securing means to cap  27 . Gas channel  21  is a channel though which gas flows from the tank into the housing unit  20  through at least one gas intake from compressed gas tank port  24  or  26 , and out of gas output port  23 . Therefore, gas channel  21  is a channel formed between the gas intake ports and output port that is formed by the walls of housing unit  20 . 
     Housing unit  20  is generally comprised of a metallic material or metal alloy which is not reactive with the contents of the tank. Depending on the gas contents of the compressed gas tank and/or on intended use, the housing unit may be comprised of a non-corrosive metal. One having ordinary skill in the art would recognize that the housing unit  20  could comprise one of many different types of metals or combinations of metals and metal alloys so long as the housing unit  20  is constructed such that it (1) is structurally capable of withstanding the pressure that will be exerted onto the housing unit by the output stream as well as the internal pressure of the compressed gas tank, and (2) is not reactive with the contents of the tank. Several metals are capable of being used to construct the housing unit including, but not limited to, brass, copper, aluminum, iron, steel, stainless steel, graphite, platinum, titanium, silver, lead, silicon bronze, manganese bronze, cadmium, zinc, magnesium, and alloys of any of the foregoing. Likewise, the housing unit can be comprised of a non-metal such as polyvinyl chloride (PVC), polyethylene or a similar plastic. In the depicted embodiment, the housing unit  20  is of a unitary construction. However, the depiction should not be limiting as the housing unit could be comprised of multiple parts joined together. For example, in one embodiment, the housing unit output shoulder  25  could be a separate part attached to the housing unit through attachment means such as through corresponding threading which would allow the housing unit output shoulder to screw into or onto the housing unit. 
     Turning to  FIG. 3 , housing unit  20  is generally tubular in shape and is capable of attaching to an access port  6  of a compressed gas tank  8  through securing means to compressed gas tank or primary valve  22  in such a manner that the housing unit and thus the safety valve device extends inwardly into the compressed gas tank. Indeed, in at least one embodiment, the entirety of housing unit  20  is located inside the compressed gas tank during operation. Housing unit  20  is likewise also capable of connecting to a primary valve  1  through securing means to compressed gas tank and primary valve  22 . In the depicted embodiment, securing means to compressed gas tank and primary valve  22  comprises external threading around gas output port  23  which mates with the corresponding internal threading on the access port of the compressed gas tank  8  and/or primary valve  1 . Multiple means and arrangements of attaching or mounting the housing unit to the compressed gas tank  8  and/or the primary valve  1  are possible, including, but not limited to, welding the housing unit to the tank or using fasteners which would allow for a substantial seal between the housing unit and either the compressed gas tank or the primary valve such that gases cannot pass through the seal. The housing unit can connect directly or indirectly to a compressed gas tank. For example, the housing unit could connect indirectly to a compressed gas tank such as through an adapter.  FIG. 3  depicts an embodiment of indirect connection to a compressed gas tank wherein the housing unit connects directly to primary valve  1  and indirectly to compressed gas tank  8 . However, it remains possible that the housing unit could connect directly to both a valve and to a compressed gas tank or that it could connect indirectly to either or both a valve and a compressed gas tank such as through an adapter piece. 
     As seen in  FIGS. 2-6 , housing unit  20  of the depicted embodiments has a generally tubular or cylindrical shape. The housing unit  20  is capable of comprising various forms, each of which comprises at least one intake to allow for the contents of the tank to enter the housing unit and a gas output port  23  to allow for the output stream to pass out from the housing unit  20  to the ambient atmosphere. In the depicted embodiment, housing unit  20  is a cylindrical housing unit which comprises a top housing unit gas output port  23 , a bottom housing unit intake port  24 , and at least one side intake port  26  on the sides of the housing unit. Depending on the shape of the housing unit and the desired flow rate, multiple configurations for the intake ports are possible so long as the following two requirements are met. First, the intake port(s) and the outlet or output port(s) are configured such that a gas channel such as housing unit gas channel  21  is formed which allows for the output stream to flow from the tank and through the output port of the housing unit and access port of the compressed gas tank. Second, the intake ports must be positioned in a manner such that when the plug is activated, a controlled bleed off is achieved. Therefore, in a simpler design, it is possible for the housing unit to comprise an outlet on the top end of the housing unit and a single intake on the bottom end of the housing unit. However, in more complex designs such as those depicted in  FIGS. 2-4 , the housing unit comprises multiple intake ports, allowing for an alteration in output flow rate. 
     As stated, the housing unit could comprise multiple different shapes so long as the plug housed inside the housing unit is capable of moving from an inactivated position to an activated position and is also capable of forming at least a partial seal inside the housing unit when the plug is in the activated position. In the depicted embodiment, the housing unit  20  is a tubular housing unit, at least one portion of the housing unit is diametrically larger than the plug  30 , and the housing unit has a reduced diameter portion which forms housing unit output shoulder  25  that is diametrically smaller than the diameter of the plug. By way of illustrating some of the diverse configurations possible, in another embodiment, the housing unit could be a cylindrical housing unit, at least one part of the housing unit is diametrically larger than the plug to allow for the plug to move between the inactive and activated positions, the housing unit has a reduced diameter portion referred to generically as a shoulder which is diametrically smaller than the diameter of the plug such that when the plug is activated, the plug will come into contact with the shoulder, create at least a partial seal with the shoulder and allow for a controlled bleed off of the output stream. In the depicted embodiments, housing unit  20  is diametrically smaller than the access port  6  on the compressed gas tank  8  to allow for installation or removal of the housing unit  20 . In the depicted embodiment, the housing unit  20  has a portion that is diametrically larger than the diameter of each of the plug  30 , actuator spring  40 , and actuating rod  50 , and a portion that is diametrically reduced such that it is diametrically smaller than the diameter of the plug  30 . When in the activated position, plug  30  forms at least a partial seal with housing unit output shoulder  25 , the diametrically reduced portion, to achieve a controlled bleed off of the output stream. 
     In the embodiments as depicted in  FIGS. 2-5 , housing unit  20  comprises several attachment means including securing means to compressed gas tank or primary valve  22 , housing unit securing means to cap  27 , and housing unit securing means to gas mixing tube adapter  28 . As depicted, each of the attachment or securing means encompass external threading which corresponds to internal threading on a respective object. Therefore, in the particularly depicted embodiment, housing unit  20  has three sets of external threading broken down into a top external threading (securing means to compressed gas tank or primary valve  22 ), a middle external threading (housing unit securing means to gas mixing tube adapter  28 ), and a bottom external threading (housing unit securing means to cap  27 ). Multiple means other than the use of corresponding threading could be utilized which would function to attach the housing unit to the various objects identified herein. For example, several of the attachment means could be welded together or different types of fasteners could be utilized. Only the connections which create a channel between the contents of the compressed gas tank and the atmosphere or objects located outside the compressed gas tank are required to be substantially sealed as to prevent gas from leaking out of the tank. Thus, in the depicted embodiment, only securing means to compressed gas tank or primary valve  22  need be so sealed. Furthermore, the corresponding threading could be switched such that, in another embodiment, either or both the top and bottom threading could be internal threading which correspond with external threading on the objects to which the housing unit is to be attached. 
     Depending on the intended use, multiple configurations for the attachment or securing means could be utilized aside from the top, middle, and bottom classifications mentioned above. For example, when deemed unnecessary for an intended use, certain securing means could be omitted entirely; or, if deemed necessary, additional attachment means could be included either to the housing unit itself or to an adapter attached to the housing unit. As depicted, the housing unit comprises an attachment means which allows for the housing unit to attach to a compressed gas tank and/or to a control valve via threading which corresponds to threading on the object to which the housing unit is to be attached. To accomplish this attachment, the housing unit is externally threaded on the output end to allow for connection to an internally threaded valve. For direct connection to the tank, the housing unit could be externally threaded on one end to allow for connection of the housing unit to the internal threading of a tank&#39;s valve slot. Likewise, the housing unit could be constructed with externally threading on one end to allow for the connection of the housing unit to both a tank and a control valve. The depicted embodiment utilizes a cap  60  with internal threading, the cap securing means to housing unit  61 , which attaches to housing unit  20  at or near the bottom gas intake port  24  through the external threading located around bottom gas intake port  24 . 
     It is common in the industry to utilize a mixing tube in a compressed gas tank so as to draw gas from various points in the tank. To accomplish this use, the depicted safety valve device comprises a housing unit  20  with housing unit securing means to gas mixing tube adapter  28 . The gas mixing tube adapter  70  has threading, gas mixing tube adapter securing means to housing unit  71 , which corresponds with the securing means to gas mixing tube adapter  28 , securing the gas mixing tube adapter  70  to housing unit  20 . Gas mixing tube adapter  70  comprises a gas mixing tube adapter securing means to gas mixing tube  73  (depicted as internal threading) through which a gas mixing tube can be attached to the gas mixing tube adapter  70 . Once attached the gas mixing tube adapter is attached to the housing unit  20  through the aforementioned securing means and acts as a sheath covering the gas intake ports ( 24  and  26 ) of the housing unit. Thus, gas from the gas mixing tube enters the gas mixing tube adapter  70  whereby it is capable of entering the housing unit  20  through gas intake ports  24  or  26 . In yet another embodiment, the housing unit is externally threaded to allow for the direct connection of a mixing tube to the housing unit without the need for the adapter. 
     Plug  30  is a ball or spool valve into which channels have been bored that act as a controlled bleed off vein when plug  30  is in the activated position. When in the activated position, plug  30  contacts housing unit output shoulder  25  in a manner such as to form at least a partial seal with housing unit output shoulder  25  restricting the flow of the output stream from the tank through housing unit gas channel  21  and out gas output port  23 . Thus, when plug  30  is in the activated position wherein plug  30  forms at least a partial seal with housing unit output shoulder  25 , at least a portion of gas output port  23  will be blocked by plug  30 . This partial seal will cause the output stream to flow through the controlled bleed off veins in plug  30 . These controlled bleed off veins are represented in  FIGS. 3 and 4  by single controlled bleed off vein  31  and in  FIG. 5  by multiple input controlled bleed off vein  32 . The controlled bleed off channels formed by single controlled bleed off vein  31  and by multiple input controlled bleed off vein  32  are diametrically smaller than gas output port  23 . Therefore, the output stream exiting through the controlled bleed off veins would exit via a controlled bleed off, eliminating many of the physical dangers discussed previously in the Background section. It is important to note that the controlled bleed off veins could be formed in various configurations and could be constructed based on the desired rate of a controlled bleed off. For example, if a user would require a faster rate of bleed off for a larger tank, a greater quantity of controlled bleed off veins could be formed in the plug to allow for the increased rate. The only requirement for the controlled bleed off vein(s) is that a controlled bleed off channel is formed through the plug when the plug is in the activated position. 
     It should also be noted that there is no requirement for plug  30  to be spherical in shape as it is depicted in the Figures. Rather, plugs of any of a multitude of shapes including, but not limited to, cubes, cylinders, pyramids, and discs could be used so long as the plugs are (1) capable of allowing a normal output stream flow when in an inactivated position and (2) capable of facilitating a controlled bleed off of the output stream when in the activated position. 
     Actuating rod  50  has two opposing ends. A first end of actuating rod  50  extends into the primary valve  1  wherein it contacts or abuts valve seat  2 . The second, opposing end of actuating rod  50  extends into housing unit  20  through gas output port  23  wherein it enters but does not pass through the controlled bleed off veins  31  or  32  in plug  30 . Depending on the contents of the tank, actuating rod  50  may be a non-corrosive medal rod. The depicted actuating rod  50  is a metallic rod that contacts valve seat  2  on one end and pierces but does not pass fully though plug  30  on the other end; however, multiple embodiments for the actuating rod could be used. For example, the actuating rod could be of any of a number of materials which (1) is capable of withstanding and countering the force exerted on plug  30  by actuator spring  40  and/or the output stream during normal use, and (2) will not detrimentally react with the contents of the compressed gas tank. Therefore, various metals, plastics, glass, and other substances can be used to form the actuating rod. Furthermore, it is also conceivable that at least one end of the actuating rod have some sort of stopper or catching mechanism which is used to aid in maintaining the contact between the actuating rod  50  and either plug  30  or valve seat  2  during normal operation when the plug  30  is in the inactivated position. For example, the end of the actuating rod  50  which contacts valve seat  2  could have a flat platform-like structure attached to it to aid in maintaining the contact between the valve seat  2  and the actuating rod  50 . Some sort of adhesive could likewise be used to keep the actuating rod  50  in contact with valve seat  2 . 
     Several different embodiments for the end of the actuating rod which contacts the plug could also be used. As depicted, the end of the actuating rod  50  pierces the plug  30  but does not pass all the way through the plug  30 . This is possible without additional components because of the configuration of single controlled bleed off vein  31  and multiple controlled bleed off vein  32 . In the single controlled bleed off vein  31  configuration, the controlled bleed off vein comprises a reduced diameter on the side facing the input port such as to prevent the actuating rod  50  from passing through the plug. Likewise, the T-shaped configuration of multiple controlled bleed off vein  32  creates a platform in the plug  30  upon which the plug end of the rod rests during normal operation. In another embodiment, however, it is conceivable that the rod would pierce entirely through the plug, but that the rod would have some sort of stopping means which would allow for it to catch the plug and thus counter the actuating force exerted by the actuator. In yet another embodiment, the actuating rod comprises a stopper near the end such that the end can pierce the plug by entering a controlled bleed off vein in the plug, but the stopper ensures that the actuating rod does not pass entirely through the plug. In yet another embodiment, one end of the actuating rod will have a stopper which is capable of allowing for sufficiently secure contact between the actuating rod and the plug such that the actuating rod can counter the force exerted on the plug by the spring without piercing the plug. In yet another embodiment, one end of the actuating rod will be shaped in a manner such as to compliment the shape of the plug such that the actuating rod can securely contact the plug in a manner so as to counteract the force exerted by the spring on the plug without piercing the plug. For example, in the depicted embodiment, the plug  30  is a spherical plug or spool valve. An actuating rod could be utilized which has a concave, semi-circular end which is capable of cupping the plug so as to provide the contact necessary to allow the actuating rod to counter the force exerted by the spring on the plug. Please note, the actuating rod  50  only counters the force of the actuator spring  40  on plug  30  when the primary valve  1  is attached to the housing unit  20 , either directly or indirectly. If the primary valve  1  were to be detached from the housing unit  20 , countering force provided by the valve seat  2  through actuating rod  50  would cease countering the force exerted upon the plug  30  by actuator spring  40 , allowing the force of actuator spring  40  to plug  30  into the activated position. 
     As previously stated, when the plug is in the inactivated position, plug  30 , actuator spring  40 , and a portion of actuating rod  50  are housed inside housing unit  20  in a manner such that plug  30  is situated between actuator spring  40  and gas output port  23  such that the force exerted by actuator spring  40  onto plug  30  would push plug  30  into the activated position if the countering force exerted on plug  30  by valve seat  2  through actuating rod  50  were to cease. Cap  60  connects to housing unit  20  through cap securing means to housing unit  61  and corresponding housing unit securing means to cap  27 . Cap  60  acts as a platform which supports actuator spring  40  such that actuator spring  40  can exert a force on plug  30  to move plug  30  to the activated position. In order to allow for gas to pass through bottom gas intake port  24 , cap  60  comprises cap intake port  62  as most clearly depicted in  FIG. 2 . 
     Multiple configurations for the cap  60  could be used. If a compressed helical spring is used or any similar variant of a compression spring or other similar device as actuator spring  40 , any other platform upon which the spring can rest and exert the required force to push the plug  30  into the activated position will suffice. In one such embodiment, the housing unit would comprise a gas channel, at least one intake, an output port or outlet, and a platform with a cross section upon which the spring can rest such that it is capable of exerting a force on the plug to activate the plug. Turning to  FIGS. 2 and 6 , there is, generally a cap  60  which provides a platform upon which the spring can rest such that it is capable of exerting a force on the plug to activate the plug and wherein the platform is capable of allowing the contents of the tank to pass there through. To fulfill these functions, cap  60  generally comprises cap securing means to housing unit  61 , cap gas intake port  62 , and cap socket(s)  63 . Cap sockets  63  allow for the use of tools such as a spanner wrench to secure the cap  60  to housing unit  20 . Once cap  60  is secured to housing unit  20 , the sockets can then be used to secure the joined housing unit  20  and cap  60  structure to either the tank or the valve. Furthermore, the channels which comprise cap sockets  63  allow gas entering through the mixing gas tube to flow more readily to side gas intake ports  26 . 
     In an additional embodiment, the mechanical actuator such as actuator spring  40  could be an elongated helical spring which is located between the gas output port and the plug such that the spring would pull the plug into the activated position when the actuating rod ceases to counteract the force exerted upon the plug by the spring. In such an embodiment, no platform would be required underneath the plug; rather, the spring would be connected or attached to the plug and the housing unit in a manner to allow the spring to pull the plug into the activated position. 
     When the plug is in the inactivated position, actuator spring  40  is a compressed helical compression spring. When the countering force provided through actuating rod  50  and valve seat  2  ceases, such as when primary valve  1  is separated from the housing unit, the normally contracted spring expands, pushing the plug into the activated position. Multiple types of compression springs are capable of being used. Likewise, the spring can be made out of many different types of metals so long as the metals do not react with the contents of the tank. For example, depending on the configuration of the plug and the contents of the tank, the spring may be a tapered spring and may be a non-corrosive compression spring. 
     How the Component Parts Work 
     During normal operation, a primary valve  1  is attached to the compressed gas tank  8  at a compressed gas tank access port  6 . Under normal operation, one end of actuating rod  50  would be located inside the primary valve wherein the end of the actuating rod will contact valve seat  2 . The other end of actuating rod  50  will extend into housing unit  20  and contact plug  30  as described above. Thus, in normal operations, the resistance and countering force on the plug  30  provided by valve seat  2  through actuating rod  50  prevents the actuator such as actuator spring  40  and the output stream from pushing plug  30  into the activated position. It is the resistance by valve seat  2  through actuating rod  50  which effectively blocks the plug from moving to the activated position when primary valve  1  remains secured to either the access port of the compressed gas tank, the safety valve device, or both. 
     Therefore, in normal operations, the output stream is capable of flowing from the tank, into housing unit gas channel  21  of housing unit  20  through side gas intake ports  26  and bottom gas intake port  24 . Please note, if gas mixing tube adapter  70  is attached to housing unit  20 , the output stream will flow through gas mixing tube (not depicted) into the chamber formed between gas mixing tube adapter  70  and housing unit  20  before the output stream enters housing unit gas channel  21  through side gas intake ports  26  and bottom gas intake port  24 . Once the output stream has entered the gas channel  21  of housing unit  20 , the output stream is capable of unrestrictedly leaving gas channel  21  past housing unit output shoulder  25  and through gas output port  23 . From gas output port  23 , the gas flows into primary valve  1 . One having ordinary skill in the art would recognize means by which the gas flows out primary valve  1  as well as the multitude of uses for the exiting gas. 
     In the event that primary valve  1  is separated from the compressed gas tank in any fashion, the resistance or countering force exerted by valve seat  2  on plug  30  through actuating rod  50  will cease. Thus, if such separation occurs, actuator spring  40  will move plug  30  from the inactivated position into the activated position wherein plug  30  contacts and forms at least a partial seal with housing unit output shoulder  25 , diminishing the rate of the output stream flow through housing unit gas channel  21  and out gas output port  23 . Although actuator spring  40  is the primary means of moving plug  30  into the activated position in contact with housing unit output shoulder  25 , the output stream moving through housing unit gas chamber  21  from bottom gas intake port  24  and side intake ports  26  also aids in moving the plug  30  into the activated position as well as in holding the plug in the activated position. The gas passing through bottom intake port  24  will form a stream which will help push and direct plug  30  towards gas output port  23 . As previously stated, in one embodiment, side intake ports  26  are bored or otherwise formed through the sides of housing unit  20  at an angle such that the gas streams passing through side intake ports  26  are directed towards housing unit output port. Therefore, once plug  30  passes side intake ports  26  on the way to its activated position in contact with housing unit output shoulder  25 , plug  30  will be further pushed into the activated position by the combined gas streams which enter housing unit gas chamber  21  through side intake ports  26 . Once plug  30  is in the activated position, actuator spring  40  and previously discussed gas streams aid in holding plug  30  in the activated position. With plug  30  in the activated position, at least a portion of the output stream can only exit housing unit  20  by passing through the controlled bleed off veins (depicted as  31  or  32 ) in the plug. The combined channels which comprise controlled bleed of veins  31  or  32  have a smaller diameter than the diameter of gas output port  23 . For this reason, the flow rate of the output stream traveling from the compressed gas tank through the controlled bleed off veins  31  or  32  in plug  30  is reduced as compared to the unhindered flow rate of the output stream wherein the plug is not in the activated position. Therefore a controlled bleed off channel is formed between the contents of the compressed gas tank and the ambient atmosphere. As shown in  FIGS. 3-5  and discussed herein, multiple variations on the configuration and number of controlled bleed off veins in plug  30  could be used to further control the flow rate of the output stream in the event the primary valve  1  is separated from a compressed gas tank. 
     Additional components can be added to the safety valve device which allows the device to act more efficiently even when the plug is in the inactivated position. For example, as depicted in the figures, gas mixing tube adapter  70  can be attached to housing unit  20  through housing unit securing means to gas mixing tube adapter  28 . In this particular embodiment, the securing means used are the internal threading on gas mixing tube adapter  70  which correspond to the external threading which comprise housing unit securing means to gas mixing tube adapter  28 . As previously stated, additional forms of fasteners and securing means could be utilized to attach the gas mixing tube adapter to the housing unit. Furthermore, the location at which the gas mixing tube adapter is attached to the housing unit could differentiate from what is depicted depending on the number and location of the housing unit intake ports. As seen in the embodiment in  FIGS. 1, 3, 4, and 5 , the gas mixing tube adapter  70  attaches to the housing unit in a manner such that it creates a sheath around the housing unit input ports that the gas entering the gas mixing tube (not depicted) is capable of passing through the intake ports ( 24 ,  26 , or both  24  and  26 ) of the housing unit. Cap sockets  63  are utilized to aid in directing the incoming output stream from the gas mixing tube to the side gas intake ports  26 . 
     For the purpose of understanding the safety valve device, references are made in the text to exemplary embodiments of a safety valve device, only some of which are described herein. It should be understood that no limitations on the scope of the invention are intended by describing these exemplary embodiments. One of ordinary skill in the art will readily appreciate that alternate but functionally equivalent components, materials, designs, and equipment may be used. The inclusion of additional elements may be deemed readily apparent and obvious to one of ordinary skill in the art. Specific elements disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one of ordinary skill in the art to employ the present invention. 
     Reference throughout this specification to features, advantages, or similar language does not imply that all of the features and advantages that may be realized should be or are in any single embodiment. Rather, language referring to the features and advantages is understood to mean that a specific feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment. Thus, discussion of the features and advantages, and similar language, throughout this specification may, but do not necessarily, refer to the same embodiment. 
     Furthermore, the described features, advantages, and characteristics may be combined in any suitable manner in one or more embodiments. One skilled in the relevant art will recognize that the safety valve device may be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments. 
     Reference throughout this specification to “one embodiment,” “an embodiment,” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases “in one embodiment,” “in an embodiment,” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment. 
     It should be understood that the drawings are not necessarily to scale; instead, emphasis has been placed upon illustrating the principles of the invention. In addition, in the embodiments depicted herein, like reference numerals in the various drawings refer to identical or near identical structural elements. 
     Moreover, the terms “substantially” or “approximately” as used herein may be applied to modify any quantitative representation that could permissibly vary without resulting in a change to the basic function to which it is related. 
     PARTS LIST 
     
         
           1 —Primary Valve 
           2 —Valve Seat 
           3 —Valve Handle 
           4 —Valve Nut 
           5 —Valve Output Port 
           6 —Compressed gas tank access port 
           7 —Valve Relief Device 
           8 —Compressed Gas Tank 
           20 —Housing Unit 
           21 —Housing Unit Gas Channel 
           22 —Securing Means to Compressed Gas Tank or Primary Valve 
           23 —Gas Output Port 
           24 —Bottom Gas Intake Port 
           25 —Housing Unit Output Shoulder 
           26 —Side Gas Intake Port 
           27 —Housing Unit Securing Means to Cap 
           28 —Housing Unit Securing Means to Gas Mixing Tube Adapter 
           30 —Plug 
           31 —Single Controlled Bleed off Vein 
           32 —Multiple Controlled Bleed off Vein Configuration 
           40 —Actuator Spring 
           50 —Actuating rod 
           60 —Cap 
           61 —Cap Securing Means to Housing Unit 
           62 —Cap Gas Intake Port 
           63 —Cap Sockets 
           70 —Gas Mixing Tube Adapter 
           71 —Gas Mixing Tube Adapter Securing Means to Housing Unit 
           72 —Gas Mixing Tube Adapter Intake Port 
           73 —Gas Mixing Tube Adapter Securing Means to Gas Mixing Tube