Patent Publication Number: US-2022228670-A1

Title: Assemblable check valve

Description:
TECHNICAL FIELD 
     The present invention relates to an assemblable check valve, and more particularly, to an assemblable check valve in which a cap provided in a body part of a check valve and an opening/closing part for opening or closing the inside of the body part may be configured as a separated type and may be assembled separately, which may stably support a disc assembly that opens or closes a path of a fluid and at the same time, to increase the flow rate of the fluid being introduced, and which may prevent corrosion of a disc sheet even when a flow path is repeatedly opened or closed. 
     BACKGROUND ART 
     In general, a valve refers to a device that controls a flow rate, a flow velocity, a pressure, or the like of a fluid flowing in a pipe. Types of the valve include a pressure valve, a shielding valve, a flow rate control valve, a water flow valve, and a control valve as well as a check valve for allowing the fluid to flow in only one direction and blocking the flow in a direction opposite to the one direction. 
     A valve according to the related art includes a valve body and an opening/closing part that blocks or opens a path of a fluid passing through the valve body. In more detail, the valve body includes an inlet part through which the fluid is introduced, a space in which the fluid supplied to the inside of the valve body through the inlet part is retained, and an outlet part through which the fluid in the space is discharged to the outside. 
     Further, the opening/closing part includes a stem having one side located outside the valve body and the other side located inside the valve body, a handle installed on the one side of the stem, and a disc that is connected to the other side of the stem and opens or shields the inlet part or the outlet part while linearly moving in two directions. 
     Such a valve body according to the related art is formed of a cast iron casting (hereinafter, referred to as cast iron), and in general, machining is difficult due to characteristics of the cast iron which is vulnerable to a temperature change or an impact, and thus a guide for supporting the above-described stem is formed integrally with a cap for opening the inside of the valve body. 
     However, when the cap and the guide are integrally formed as described above, the size of components is increased, and thus handling is not easy. 
     Further, an inlet and an outlet cannot be welded together due to the characteristics of the cast iron, which is vulnerable to the temperature change, and the inlet and the outlet cannot be connected using a ring joint manner or a groove joint manner because it is difficult to form grooves or protrusions in the valve body due to the characteristics vulnerable to an impact. 
     Thus, improvement therefor is required. 
     DISCLOSURE 
     Technical Tasks 
     The present invention is directed to providing an assemblable check valve in which a cap provided in a body part of the check valve and an opening/closing part for opening or closing an inside thereof are configured as a separated type and thus may be assembled separately. 
     The present invention is also directed to providing an assemblable check valve capable of stably supporting a disc assembly that opens or closes a path of a fluid. 
     The present invention is also directed to providing an assemblable check valve capable of increasing a flow rate of a fluid being introduced. 
     The present invention is also directed to providing an assemblable check valve capable of preventing corrosion of a disc sheet even when a flow path is repeatedly opened or closed. 
     Technical Solution 
     One aspect of the present invention provides an assemblable check valve installed between an inlet pipe and an outlet pipe through which a fluid flows, the assemblable check valve including a body part that has an inlet region which is connected to the inlet pipe and through which the fluid is introduced, a retention region in which the fluid supplied to an inside of the body part through the inlet region is retained, and a discharge region which is connected to the outlet pipe and through which the fluid in the retention region is discharged to an outside of the body part, and an opening/closing part that has a disc assembly which is provided inside the body part and opens or closes a path of the fluid introduced through the inlet pipe, a stem which provides a movement path of the disc assembly, and a first guide that supports one side of the stem, wherein the body part has a cap that opens the inside of the body part so that the opening/closing part is retracted or extracted, the first guide has a first coupling surface fixedly inserted into an inner circumferential surface of a through-hole formed in the cap, the disc assembly includes a disc that allows a flowing fluid to be introduced or blocked and a disc stem disposed in a center of the disc and coupled to the stem, a second guide into which the disc stem is inserted is provided on the other side of the stem, an outer circumferential surface of the disc stem slides in an axial direction while being supported by an inner circumferential surface of the second guide, an in guide that supports the other side of the disc stem is provided in an inner circumferential surface of the inlet pipe, and the in guide has a support ring through which the other side of the disc stem is supported to pass and a support bar extending radially outward from the support ring and fixed to the inner circumferential surface of the inlet pipe in a welding manner. 
     Another aspect of the present invention provides an assemblable check valve installed between an inlet pipe and an output pipe through which a fluid flows, the assemblable check valve including a body part that has an inlet region which is connected to the inlet pipe and through which the fluid is introduced, a retention region in which the fluid supplied to an inside of the body part through the inlet region is retained, and a discharge region which is connected to the outlet pipe and through which the fluid in the retention region is discharged to an outside, and an opening/closing part that has a disc assembly which is provided inside the body part and opens or closes a path of the fluid introduced through the inlet pipe, a stem which provides a movement path of the disc assembly, and a first guide that supports one side of the stem, wherein the body part has a cap that opens the inside of the body part so that the opening/closing part is retracted or extracted, a first coupling surface fixedly inserted into an inner circumferential surface of a through-hole formed in the cap is formed in the first guide, a stepped surface, on which a first surface extending axially and a second surface extending radially outward are formed, is formed on the inner circumferential surface of the through-hole, and a second coupling surface fixedly inserted into the stepped surface is formed on the first guide. 
     A first coupling groove recessed in an axial direction of the stem may be formed in one side of the first guide, and a first bush that simultaneously supports an inner circumferential surface of the first guide and an outer circumferential surface of the stem may be inserted into the first coupling groove. 
     A second coupling groove recessed in the axial direction of the stem may be formed in the other side of the first guide, and a second bush that simultaneously supports the inner circumferential surface of the first guide and the outer circumferential surface of the stem may be inserted into the second coupling groove. 
     A separation surface spaced apart from the outer circumferential surface of the stem may be formed in the second coupling groove. 
     Fastening grooves may be formed radially inward along circumferences in outer circumferential surfaces of the body part and the cap, and the assemblable check valve may further include a coupler having a pair of legs extending radially inward so that the legs are inserted into the pair of fastening grooves facing each other. 
     Still another aspect of the present invention provides an assemblable check valve installed between an inlet pipe and an outlet pipe through which a fluid flows, the assemblable check valve including a body part that has an inlet region which is connected to the inlet pipe and through which the fluid is introduced, a retention region in which the fluid supplied to an inside of the body part through the inlet region is retained, and a discharge region which is connected to the outlet pipe and through which the fluid in the retention region is discharged to an outside of the body part, and an opening/closing part that has a disc assembly which is provided inside the body part and opens or closes a path of the fluid introduced through the inlet pipe, a stem which provides a movement path of the disc assembly, and a first guide that supports one side of the stem, wherein the body part has a cap that opens the inside of the body part so that the opening/closing part is retracted or extracted, a first coupling surface fixedly inserted into an inner circumferential surface of a through-hole formed in the cap is formed in the first guide, an in plate having an inlet hole through which the fluid introduced through the inlet pipe flows is formed at an end of the inlet region, an insertion groove into which a circumference of the inlet pipe is inserted by a predetermined length in an axial direction is formed in the in plate, a reinforcement rib, which extends axially toward the disc assembly and is fixed to the circumference of the inlet hole in a hardface-welding manner using a corrosion-resistant welding rod, is provided at a circumference of the inlet hole, and a seating surface on which the disc assembly is seated is formed in the reinforcement rib, and a downward inclination is formed on the seating surface in a direction away from the disc assembly so that a contact area between the disc assembly and the seating surface increases as an elastic restoring force of a spring increases. 
     Locking grooves extending radially inward along circumferences of the inlet pipe and the outlet pipe may be formed in the inlet pipe and the outlet pipe. 
     Flanges extending radially outward along circumferences of the inlet pipe and the outlet pipe may be formed in the inlet pipe and the outlet pipe. 
     Fastening grooves may be formed radially inward along circumferences in an outer circumferential surface of the discharge region and an outer circumferential surface of the outlet pipe formed in the body part, and the assemblable check valve may further include a coupler having a pair of legs extending radially inward so that the legs are inserted into the pair of fastening grooves facing each other. 
     Advantageous Effects 
     In an assemblable check valve having the above configuration according to the present invention, since a cap provided in a body part and an opening/closing part for opening or closing an inside are configured as a separated type and are then separately assembled, the volume is reduced, and thus handling is easy, and workability is improved. 
     Further, since first and second bushes are provided in a first guide to support a disc assembly for opening or closing a path of a fluid, the disc assembly is stably supported, and thus an opening/closing operation can be reliably performed. 
     Further, an in guide provided in an inlet pipe to support the other side of a disc stem includes a support ring and a support bar, and thus a flow rate of a fluid being introduced can increase, and smooth flow can be achieved. 
     In addition, a reinforcement rib is provided at a portion on which the disc assembly is seated to close a flow path, and thus corrosion of the disc sheet can be prevented even when the flow path is repeatedly opened or closed. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a check valve according to an embodiment of the present invention. 
         FIGS. 2 and 3  are cross-sectional views illustrating the check valve according to the present invention, wherein  FIG. 2  is a view illustrating a state in which a flow path is closed, and  FIG. 3  is a view illustrating a state in which the flow path is opened. 
         FIG. 4  is an exploded cross-sectional view illustrating an opening/closing part according to the present invention. 
         FIG. 5  is a plan view illustrating an in-guide according to the present invention. 
         FIG. 6  is a cross-sectional view illustrating a check valve according to another embodiment of the present invention. 
         FIG. 7  is a cross-sectional view illustrating an in-plate according to the present invention. 
         FIGS. 8 and 9  are cross-sectional views illustrating a check valve according to still another embodiment of the present invention. 
     
    
    
     EMBODIMENTS 
     Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and the same reference numerals are assigned to the same or similar components throughout the specification. 
     It should be understood in the present specification that the terms “include” or “have” are intended to indicate that there are features, numbers, steps, operations, components, parts, or combinations thereof that are described in the specification and do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. 
       FIG. 1  is a perspective view illustrating a check valve according to an embodiment of the present invention,  FIGS. 2 and 3  are cross-sectional views illustrating the check valve according to the present invention, wherein  FIG. 2  is a view illustrating a state in which a flow path is closed, and  FIG. 3  is a view illustrating a state in which the flow path is opened,  FIG. 4  is an exploded cross-sectional view illustrating an opening/closing part according to the present invention,  FIG. 5  is a plan view illustrating an in-guide according to the present invention,  FIG. 6  is a cross-sectional view illustrating a check valve according to another embodiment of the present invention,  FIG. 7  is a cross-sectional view illustrating an in-plate according to the present invention, and  FIGS. 8 and 9  are cross-sectional views illustrating a check valve according to still another embodiment of the present invention. 
     As illustrated in  FIG. 1 , an assemblable check valve  30  according to the present invention, which is a check valve  30  installed between an inlet pipe  10  and an outlet pipe  20  through which a fluid flows, includes a body part  100  through which a fluid is introduced or discharged and an opening/closing part  200  that opens or closes a path of the fluid introduced into the body part  100 . 
     The body part  100  is provided with a cap  140  that opens the inside of the body part  100  so that the opening/closing part  200  may be retracted or extracted. As illustrated in  FIG. 1 , the cap  140  may be fastened to the body part  100  using a coupler  150 , and a fastening structure of the cap  140  and the body part  100  through the coupler  150  will be described below. 
     Further, the opening/closing part  200  is provided with a handle  50  for adjusting the degree of opening of the path of the fluid, and the body part  100  is provided with an indicator  60  through which an operator visually identifies the degree of opening. 
     In addition, a bypass pipe  40  is provided so that the fluid introduced through the inlet pipe  10  directly moves to the outlet pipe  20  without passing through the body part  100 . 
     As illustrated in  FIGS. 2 and 3 , the body part  100  includes an inlet region  110  which is connected to the inlet pipe  10  and into which the fluid is introduced, a retention region  120  in which the fluid supplied to the inside of the body part  100  through the inlet region  110  is retained, and a discharge region  130  which is connected to the outlet pipe  20  and through which the fluid in the retention region  120  is discharged to the outside of the body part  100 . 
     Thus, the fluid flowing to the inlet pipe  10  is introduced into the body part  100  through the inlet region  110  and is discharged to the outside of the body part  100  through the discharge region  130  via the retention region  120 . In this case, the fluid discharged to the discharge region  130  flows along the outlet pipe  20 . 
     The opening/closing part  200  that opens or closes the path of the fluid introduced through the inlet pipe  10  is included in the body part  100 , and the opening/closing part  200  includes a disc assembly  210  that opens or closes the path of the fluid introduced through the inlet pipe  10 , a stem  220  that provides a movement path of the disc assembly  210 , and a first guide  230  that supports one side of the stem  220 . 
     That is, the disc assembly  210  may open or close the path of the fluid while sliding along the stem  220 , and the first guide  230  may stably support the stem  220 , thereby reliably performing the opening/closing operation. 
     Further, as illustrated in  FIG. 4 , the body part  100  is provided with the cap  140  that opens the inside of the body part  100  so that the opening/closing part  200  may be retracted or extracted, and the first guide  230  has a first coupling surface  231  fixedly inserted into an inner circumferential surface of a through-hole  141  formed in the cap  140 . 
     That is, the first coupling surface  231  is formed so that the first guide  230  that supports one side of the stem  220  of the opening/closing part  200  is fixedly inserted into the cap  140 . Thus, the cap  140  provided in the body part  100  and the opening/closing part  200  that opens or closes the flow path are configured as a separated type and are then assembled separately. Thus, the overall volume of the cap  140  may be reduced, thereby facilitating handling and improving workability. 
     In this case, the body part  100  may have an integrated structure in which a region, in which the opening/closing part  200  is installed, is disposed in a straight line through the inlet region  110 , the retention region  120 , and the cap  140 . This is because the length of the stem  220  exposed to the outside of the body part  100  may be configured to be short as the stem  220  is disposed in the inlet region  110  and the retention region  120  arranged in a straight line, and thus the overall compact check valve  30  may be formed. 
     At least one of the body part  100  and the cap  140  may be formed as a pipe made of steel or stainless steel, and thus the volume and the weight can be reduced and the durability can be increased. 
     In addition, as illustrated in  FIG. 4 , a stepped surface  142  extending radially outward is formed on the inner circumferential surface of the through-hole  141 , and a second coupling surface  232  fixedly inserted into the stepped surface  142  is formed on the first guide  230 . 
     That is, in order to enable a stable opening/closing operation of the flow path through the opening/closing part  200 , the opening/closing part  200  needs to be accurately fixed to the cap  140 . To this end, as described above, the stepped surface  142  extending radially outward is formed on the inner circumferential surface of the through-hole  141  formed in the cap  140 , and the second coupling surface  232  fixedly inserted into the stepped surface  142  is formed on the first guide  230 . In this case, the stepped surface  142  is formed with a first surface  142   a  extending axially and a second surface  142   b  extending radially outward. 
     In this case, as illustrated in  FIG. 4 , a first coupling groove  233  recessed in an axial direction of the stem  220  may be formed in one side of the first guide  230 , and a first bush  240  that simultaneously supports an inner circumferential surface of the first guide  230  and an outer circumferential surface of the stem  220  may be inserted into the first coupling groove  233 . 
     That is, after the first bush  240  is first fixedly inserted into the first coupling groove  233  recessed in one side of the first guide  230 , the stem  220  is installed to pass through the first bush  240 , and thus the first bush  240  supports the stem  220 . 
     In order to install the first bush  240  in the first guide  230 , mutually corresponding screw structures may be formed in the inner circumferential surface of the first guide  230  and an outer circumferential surface of the first bush  240 . 
     Further, in order to prevent the fluid from leaking between the outer circumferential surface of the stem  220  and an inner circumferential surface of the first bush  240  in a state in which the stem  220  passes through the first bush  240 , a separate O-ring may be provided in the first bush  240 . 
     In this case, a second coupling groove  234  recessed in the axial direction of the stem  220  may be formed in the other side of the first guide  230 , and a second bush  250  that simultaneously supports the inner circumferential surface of the first guide  230  and the outer circumferential surface of the stem  220  may be inserted into the second coupling groove  234 . 
     That is, like the first bush  240 , after the second bush  250  is first fixedly inserted into the second coupling groove  234  recessed in the other side of the first guide  230 , the stem  220  is installed to pass through the second bush  250 , and thus the second bush  250  supports the stem  220 . 
     As described above, in order to install the second bush  250  in the first guide  230 , mutually corresponding screw structures may be formed in the inner circumferential surface of the first guide  230  and an outer circumferential surface of the second bush  250 . 
     In this case, as illustrated in  FIG. 4 , a thread s may be formed in the outer circumferential surface of the stem  220 , and a corresponding thread ds corresponding to the thread s may be formed in an inner circumferential surface of the second bush  250 . 
     That is, when a user turns the handle  50 , the stem  220  is rotated, and the thread s is moved in an axial direction along the corresponding thread ds formed in the second bush  250 . 
     In this way, since the first bush  240  and the second bush  250  are provided in the first guide  230 , the stem  220  may be stably supported. As a result, the disc assembly  210  may be stably supported, and thus the opening/closing operation can be reliably performed. 
     Further, as illustrated in  FIG. 4 , the second coupling groove  234  may be formed with a separation surface  234   a  mutually spaced apart from the outer circumferential surface of the stem  220 . 
     The separation surface  234   a  may be formed between the first bush  240  and the second bush  250 . When the separation surface  234   a  is formed in this way, the stem  220  is supported only by the first bush  240  and the second bush and is not in direct contact with the inner circumferential surface of the first guide  230 . Thus, when the user rotates the stem  220  using the handle  50 , the stem  220  may be smoothly rotated even with a small force. 
     In this case, as illustrated in  FIGS. 2 to 4 , the disc assembly  210  may include a disc  211  that allows the flowing fluid to be introduced or blocked and a disc stem  212  that is disposed at a center of the disc  211  and is coupled to the stem  220 . 
     That is, when the fluid introduced through the inlet pipe  10  applies a pressure to the disc  211 , the disc  211  and the disc stem  212  assembled thereto are pushed, and the disc stem  212  is moved in the axial direction of the stem  220  in a state of being coupled to the stem  220 . 
     In this case, the opening/closing part  200  is provided with a spring  260  that is installed in a circumference of the stem  220  and provides an elastic restoring force to shield the fluid introduced through the inlet pipe  10 . 
     In this case, a second guide  221  into which the disc stem  212  is inserted may be provided on the other side of the stem  220 , and the outer circumferential surface of the disc stem  212  may slide in an axial direction while being supported by an inner circumferential surface of the second guide  221 . 
     That is, when the disc  211  is pushed by the fluid introduced through the inlet pipe  10 , the disc stem  212  is moved together. In this case, the disc stem  212  is pushed while moving in the axial direction along the inner circumferential surface of the second guide  221  provided on the other side of the stem  220 . In this way, when the outer circumferential surface of the disc stem  212  is supported by the inner circumferential surface of the second guide  221 , the disc  211  opens or closes the flow path while stably moving in the axial direction of the stem  220 . 
     In this case, fastening grooves  101  and  143  may be formed radially inward along a circumference in outer circumferential surfaces of the body part  100  and the cap  140 , and the check valve  30  may further include the coupler  150  having a pair of legs  151  extending radially inward so that the legs  151  are inserted into the pair of fastening grooves  101  and  143  facing each other. 
     The coupler  150  is obtained by assembling two or more coupling segments and may be configured by two, three, or four coupling segments according to the size thereof. 
     As described above, when the body part  100  and the cap  140  are formed of steel or stainless steel, the fastening grooves  101  and  143  are formed in a circumferential direction through machining, and when fastening is performed using the coupler  150 , the ease of fastening and stability can be secured. 
     The body part  100  may be formed as a seamless pipe or a welded steel pipe. 
     First, the seamless pipe is made by punching a hole in a material and then processing or extruding an already perforated material with a press. Representative methods include a rolling piercing method, a centrifugal casting method, an extrusion method, a drawing method, and the like. The seamless pipe is mainly used for special pipes, machine structures, and heat exchangers having high pressure resistance, high temperature resistance, low temperature resistance, corrosion resistance, and the like, which cannot be used as the welded steel pipes. 
     Further, the welded steel pipe is made by bending an iron plate and welding a joint and is classified into an electric resistance welded steel pipe (ERW steel pipe), a gas welded pipe, and an arc welding steel pipe (SAW steel pipe) according to welding manners. The welded steel pipe may be classified into a carbon steel pipe, a stainless steel pipe, a galvanized steel pipe, and the like according to the properties of raw materials. 
     When the body part  100  is configured in this way, the fastening groove  101  is formed through machining and connection is achieved in a ring joint manner or a groove joint manner or the inlet pipe  10  and the outlet pipe  20  may be connected in a welding manner. Thus, the volume and the weight can be reduced, and the durability can be increased. 
     In this case, an in guide  160  that supports the other side of the disc stem  212  may be provided in an inner circumferential surface of the inlet pipe  10 . 
     That is, as described above, one side of the disc stem  212  is supported by the second guide  221  provided in the stem  220  and the other side of the disc stem  212  is supported by the in guide  160 . As a result, the disc stem  212  can be stably supported and opened or closed. 
     The in guide  160  may be fixed to the inner circumferential surface of the inlet pipe  10  in a welding manner. 
     In this case, as illustrated in  FIG. 5 , the in guide  160  may have a support ring  161  through which the other side of the disc stem  212  is supported to pass and a support bar  162  extending radially outward from the support ring  161  to be in contact with the inner circumferential surface of the inlet pipe  10 . 
     In this way, when the in guide  160  provided in the inlet pipe  10  to support the other side of the disc stem  212  has the support ring  161  and the support bar  162 , the flow rate of the fluid being introduced can be increased and smooth flow can be achieved. 
     In this case, an in plate  170  having an inlet hole  171  through which the fluid introduced the inlet pipe  10  flows is provided at an end of the inlet region  110 , and the in plate  170  may have an insertion groove  172  into which a circumference of the inlet pipe  10  is inserted by a predetermined length in the axial direction. 
     As described above, when the body part  100  is formed of steel or stainless steel, the in plate  170  may be fixed to the body part  100  in a welding manner. Further, according to an angle between the inlet pipe  10  and the outlet pipe  20  fixedly welded to the body part  100  and the in plate  170 , as illustrated in  FIG. 3 , a horizontal check valve  30  may be configured, or as illustrated in  FIG. 6 , an angle check valve  30  may be configured. 
     In addition, the insertion groove  172  may be formed in the circumference of the inlet hole  171  formed in the in plate  170 , the circumference of the inlet pipe  10  may be inserted by a predetermined length in the axial direction, and thus the inlet hole  171  may be fixedly disposed at an accurate location. 
     In this case, as illustrated in  FIG. 7 , a reinforcement rib  173  extending axially toward the disc assembly  210  may be provided in a circumference of the inlet hole  171 , a seating surface  173   a  on which the disc assembly  210  is seated may be formed in the reinforcement rib, and the seating surface  173   a  may have a downward inclination a in a direction away from the disc assembly  210 . 
     The reinforcement rib  173  may be made of stainless steel and may be directly welded at a location on one side of the in plate  170 , in which the disc assembly  210  is seated. It is preferable that the reinforcement rib  173  is hardface-welded (built-up-welded) using a corrosion-resistant welding rod to prevent corrosion, and as a result, the corrosion resistance or hardness (increasing wear resistance in preparation for frequent operations of the disc assembly  210 ) of the reinforcement rib  173  can be increased. 
     In addition, a downward inclination is formed on the seating surface  173   a  formed in the reinforcement rib  173 . This is for effectively closing the flow path of the fluid by increasing a contact area between the disc assembly  210  and the seating surface  173   a  as the elastic restoring force of the spring increases. 
     In this case, as illustrated in  FIGS. 1 to 3 , locking grooves  12  and  22  extending radially inward along the circumferences of the inlet pipe  10  and the outlet pipe  20  may be formed in the inlet pipe  10  and the outlet pipe  20 . 
     Alternatively, as illustrated in  FIG. 8 , flanges  11  and  21  extending radially outward along the circumferences of the inlet pipe  10  and the outlet pipe  20  may be formed in the inlet pipe  10  and the outlet pipe  20 . 
     In addition, as illustrated in  FIG. 9 , the fastening grooves  101  extending radially inward along the circumference may be formed in an outer circumferential surface of the discharge region  130  and an outer circumferential surface of the outlet pipe  20  formed in the body part  100 , and the check valve  30  may further include the coupler  150  having the pair of legs  151  extending radially inward so that the legs  151  are inserted into the pair of fastening grooves  101  facing each other. 
     The coupler  150  is obtained by assembling two or more coupling segments and may be configured as two, three, or fourth coupling segments according to the size thereof. 
     To this end, it is preferable that the body part  100 , the inlet pipe  10 , and the outlet pipe  20  are formed of steel or stainless steel. In this configuration, as compared to a valve body made of cast iron according to the related art, tensile strength and water pressure resistance are increased, and thus the valve body is not easily broken or deformed in use. Further, the body part  100 , the inlet pipe  10 , and the outlet pipe  20  may be connected in a simpler manner such as a welding manner, a ring joint manner, and a groove joint manner. Thus, the workability can be improved and, and manufacturing costs can be reduced by reducing an installation period. 
     Although the embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in the present specification. Those skilled in the art who understand the spirit of the present invention could easily propose other embodiments by adding, changing, deleting, adding, or the like of components within the same scope of the spirit. Further, these other embodiments also belong to the scope of the spirit of the present invention.