Purge control valve

Abstract

The present invention discloses a purge control valve for a power plant. The disclosed purge control valve for a power plant comprises: a valve body having a fluid supply hole portion and a fluid discharge hole portion formed for supplying and discharging fluid, respectively, and a fluid pressure regulating hole portion communicating with said fluid discharge hole portion; a bonnet portion coupled to said valve body via a bolt to form a positioner operating space portion and having a steam operating sealing hole portion and a spring installation space portion; a valve opening / closing portion movably installed on said bonnet portion to selectively open / close said fluid discharge hole portion or to adjust the degree of opening / closing of said fluid discharge hole portion according to fluid pressure, and having a positioner inserted into said positioner operating space portion; a bonnet cover coupled to said bonnet portion to seal said spring installation space portion and having a steam penetration hole portion for installing said valve opening / closing portion; a cover elastic support portion provided in said spring installation space portion to elastically support said valve steam portion and elastically support said bonnet cover; and a portion provided on said valve body to selectively control the amount of fluid transferred through said fluid supply hole portion and to adjust the degree of opening / closing of said fluid supply hole portion. It is characterized by including a fluid pressure regulating unit.

Description

Technology Field

[0001] The present invention relates to a purge control valve for a power plant, and more specifically, to a purge control valve for a power plant that can improve operational safety and improve convenience of use by being usable under various types of fluids and pressure conditions. Background Technology

[0003] Generally, thermal power generation is a method of generating electricity that converts chemical energy from sources such as petroleum, coal, and natural gas into mechanical energy, which is then converted into electrical energy by a generator. Typically, fuel is burned in a boiler to generate steam, which is then used to obtain mechanical energy from a turbine, and finally converted into electricity by a generator directly connected to the turbine.

[0004] In addition, circulating fluidized bed boilers, which are frequently constructed these days, produce steam by circulating solid fuels such as fossil fuels and biomass fuels together with bed materials (or circulating media) such as sand through a furnace, cyclone, loopseal, and combustion chamber. Based on strong mixing power and heat transfer characteristics, they can burn a variety of fuels, including not only fossil fuels such as coal but also biomass.

[0005] Meanwhile, Integrated Gasification Combined Cycle (IGCC) is an eco-friendly power generation technology that produces electricity by gasifying coal at high temperature and pressure. It converts coal into synthesis gas composed mainly of hydrogen and carbon monoxide, removes harmful substances such as dust and sulfur oxides contained in the synthesis gas, and purifies it to a level similar to natural gas. Subsequently, it generates electricity by driving a gas turbine using the hydrogen and carbon monoxide in the synthesis gas and operating a steam turbine using the heat from the exhaust gases generated during the process.

[0006] In such coal gasification combined cycle (IGCC) power generation, various measuring instruments are used for safety, and diverse purge systems are applied to prevent the deterioration of measurement precision caused by the accumulation of synthetic gas and foreign substances in the lines connected to the instruments. Furthermore, the purge systems used in IGCC generally utilize nitrogen (N2) or water depending on the installation location and the type of substance to be removed, and valves suitable for the pressure conditions at the point of use are employed.

[0007] However, the purging system of a conventional coal gasification combined cycle power plant as described above has the problem that, because it requires the use of various types of valves depending on the type of gas used for purging and the pressure characteristics of the installation location, not only is the efficiency of maintenance reduced, but durability is also reduced if the pressure conditions are not met.

[0008] Meanwhile, Korean Registered Utility Model Publication No. 20-0341429 (Registration Date: January 30, 2004) discloses a 'purge check valve structure for a gas turbine'. The problem to be solved

[0010] The present invention was created out of the aforementioned necessity and aims to provide a purge control valve for power plants that can improve operational safety and enhance convenience of use by being usable under various types of fluid and pressure conditions. means of solving the problem

[0012] To achieve the above-mentioned purpose, a purge control valve for a power plant according to one aspect of the present invention comprises: a valve body having a fluid supply hole portion and a fluid discharge hole portion formed for supplying and discharging fluid, respectively, and a fluid pressure regulating hole portion communicating with the fluid discharge hole portion; a bonnet portion coupled to the valve body via a bolt to form a positioner operating space portion and having a steam operating sealing hole portion and a spring installation space portion; a valve opening / closing portion movably installed on the bonnet portion to selectively open / close the fluid discharge hole portion or to adjust the degree of opening / closing of the fluid discharge hole portion according to fluid pressure, and having a positioner inserted into the positioner operating space portion; a bonnet cover coupled to the bonnet portion to seal the spring installation space portion and having a steam penetration hole portion for installing the valve opening / closing portion; a cover elastic support portion provided in the spring installation space portion to elastically support the valve opening / closing portion and elastically support the bonnet cover; and a valve body provided to selectively control the amount of fluid transferred through the fluid supply hole portion, wherein the fluid It is characterized by including a fluid pressure control unit for controlling the degree of opening and closing of the supply hole portion.

[0013] In addition, the valve body of the present invention is characterized in that a seat fastening hole is formed so as to be perpendicular to the fluid discharge hole, a valve seat is coupled to the seat fastening hole, and the valve seat is opened and closed by the valve opening and closing part.

[0014] In addition, the purge control valve for a power plant in the present invention is characterized by further including an elastic force adjusting part coupled to the valve opening / closing part so as to be able to adjust the elastic pressure of the cover elastic support part.

[0015] In addition, the elastic force adjusting part of the present invention is characterized by comprising: an adjusting screw part formed in the valve opening / closing part; a cover support nut part coupled to the adjusting screw part to support the bonnet cover; and a position adjusting cap part coupled to the bonnet cover to seal the adjusting screw part and the cover support nut part, supported by the cover support nut part, and moving the position of the bonnet cover as the cover support nut part is rotated through rotation.

[0016] In addition, the valve opening / closing part of the present invention is characterized by comprising: a valve steam part, one end of which is inserted into the steam operating sealing hole so as to be located in the positioner operating space and coupled with the positioner, and the other end of which is formed with the adjustment screw part and exposed to the outside of the bonnet cover through the steam penetration hole part; and an opening / closing control disc that is coupled to the positioner and selectively opens / closes the valve seat of the valve body according to the movement of the valve steam part, and is formed at an angle so as to be inserted into the interior of the valve steam part.

[0017] In addition, the opening / closing control disc in the present invention penetrates the positioner so as to be seated in the disc fixing hole portion of the positioner, and is characterized by being tightly fixed to the positioner as the positioner and the valve steam portion are mutually coupled.

[0018] In addition, the cover elastic support member in the present invention is characterized by comprising: a cover support spring disposed in the spring installation space to elastically support the bonnet cover; a first spring mounting part provided in the bonnet portion to allow the valve opening / closing part to pass through and to support one end of the cover support spring; a second spring mounting part to support the other end of the cover support spring to allow the valve opening / closing part to pass through; and a cover rotation guide bearing provided between the second spring mounting part and the bonnet cover to guide the rotation of the bonnet cover so as not to transmit the rotational force of the bonnet cover, which rotates according to the operation of the elastic force adjustment part, to the cover support spring.

[0019] In addition, the fluid pressure regulating part of the present invention comprises: a plug installation hole formed in the valve body to communicate with the fluid pressure regulating hole; a pressure regulating guide block that is sealably coupled to the plug installation hole and has a regulating hole formed through its central portion; a nozzle plug having a nozzle pin portion extended at one end to be inserted into the fluid pressure regulating hole, a other end located on the outside of the pressure regulating guide block, and a position regulating screw portion formed in its central portion to be fastened to the regulating hole so as to move along the regulating hole through rotation; and a nozzle cap portion coupled to the pressure regulating guide block to cover the nozzle plug. Effects of the invention

[0021] As described above, the purge control valve for a power plant according to one aspect of the present invention, unlike the prior art, can improve operational safety, can be used under various types of fluids and pressure conditions, and can stably maintain the regulated pressure, thereby having the effect of improving convenience of use. Brief explanation of the drawing

[0023] FIG. 1 is a cross-sectional view illustrating a purge control valve for a power plant according to one embodiment of the present invention. FIG. 2 is a side view illustrating a purge control valve for a power plant according to one embodiment of the present invention. FIG. 3 is a perspective view illustrating a purge control valve for a power plant according to one embodiment of the present invention. FIG. 4 is a perspective view illustrating an elastic force control unit according to one embodiment of the present invention. FIG. 5 is a perspective view illustrating a fluid pressure control unit according to one embodiment of the present invention. Specific details for implementing the invention

[0024] Hereinafter, a preferred embodiment of a purge control valve for a power plant according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation.

[0025] Furthermore, the terms described below are defined in consideration of their functions in the present invention, and these may vary depending on the intent or practice of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0027] FIG. 1 is a cross-sectional view illustrating a purge control valve for a power plant according to one embodiment of the present invention, and FIG. 2 is a side view illustrating a purge control valve for a power plant according to one embodiment of the present invention.

[0028] In addition, FIG. 3 is a perspective view for explaining a purge control valve for a power plant according to one embodiment of the present invention, FIG. 4 is a perspective view for explaining an elastic force control unit according to one embodiment of the present invention, and FIG. 5 is a perspective view for explaining a fluid pressure control unit according to one embodiment of the present invention.

[0029] Referring to FIGS. 1 to 5, a purge control valve (100) for a power plant according to one embodiment of the present invention may largely include a valve body (110), a bonnet part (120), a valve opening / closing part (130), a bonnet cover (140), a cover elastic support part (150), a fluid pressure control part (160), and an elastic force control part (170).

[0030] In this embodiment, the purge control valve (100) for a power plant allows a user to control the transfer pressure of the fluid being transferred through the valve body (110) by operating the fluid pressure control unit (160), and the open state of the valve opening / closing unit (130) can be stably maintained according to the transfer pressure controlled by the valve opening / closing unit (130). Through this, the transfer of the fluid can be maintained uniformly according to the fluid transfer pressure.

[0031] The valve body (110) may have a fluid supply hole (111) and a fluid discharge hole (112) formed therein for supplying and discharging fluid, respectively, and a positioner operating space (113) may be provided between the fluid supply hole (111) and the fluid discharge hole (112). This valve body (110) may be installed on a purge fluid transfer line that transfers fluid to remove foreign substances in a power plant. For example, the purge fluid transfer line may be connected to the fluid supply hole (111) and the fluid discharge hole (112) of the valve body (110), and the transfer pressure of the fluid transferred inside may be adjusted according to the fluid pressure of the purge fluid transfer line.

[0032] Additionally, the valve body (110) may have a positioner operating space (113) sealed through the connection of the bonnet portion (120), and a fluid pressure regulating hole portion (114) communicating with the fluid supply hole portion (111) may be formed on one side, and a seat fastening hole (115) may be formed inside the positioner operating space portion (113), and a valve seat (116) may be fastened and fixed to the seat fastening hole (115). At this time, the seat fastening hole (115) may be formed vertically to the fluid discharge hole portion (112), and the valve seat (116) may be selectively opened or closed or the degree of opening and closing may be controlled by the valve opening / closing portion (130).

[0033] Additionally, the valve body (110) may have a dynamic pressure maintaining hole (117) formed therein so that when fluid is transferred through the positioner operating space (113), the one side space and the other side space of the positioner operating space (113), which are partitioned by the valve opening / closing part (130), can be maintained at dynamic pressure. At this time, the fluid supply hole (111) may be formed in communication with the bottom surface of the positioner operating space (113), and the dynamic pressure maintaining hole (117) may be formed in communication with the inner surface of the upper part of the positioner operating space (113).

[0034] A bonnet part (120) can be attached to such a valve body (110) by fastening a bolt.

[0035] In the bonnet portion (120) according to the present embodiment, a steam operation sealing hole portion (121) may be formed vertically through the central portion, and a spring installation space portion (123) may be provided at the upper portion, and the spring installation space portion (123) may be sealed by joining with the bonnet cover (140). At this time, a cover elastic support portion (150) may be installed in the spring installation space portion (123).

[0036] Additionally, the bonnet portion (120) may have a guide bush (125) attached to the steam operation sealing hole portion (121) so that the valve opening / closing portion (130) can move smoothly and stably. Furthermore, the valve opening / closing portion (130) can be movably inserted into the steam operation sealing hole portion (121) and sealed.

[0037] The valve opening / closing part (130) according to the present embodiment may be movably installed in the steam operating sealing hole part (121) so as to selectively open / close the fluid discharge hole part (112) or adjust the degree of opening / closing of the fluid discharge hole part (112) according to the fluid pressure. The valve opening / closing part (130) may include a valve steam part (131) inserted into the steam operating sealing hole part (121), a positioner (133) disposed in the positioner operating space part (113) and coupled to the valve steam part (131), and an opening / closing control disc (135) seated on the positioner (133) to open / close the valve seat (116).

[0038] Additionally, the degree of opening and closing of the valve opening / closing part (130) is controlled by the pressure of the fluid being transferred through the valve body (110), and the opened / closed state can be maintained uniformly by the fluid transfer pressure. At this time, the valve opening / closing part (130) can be opened and closed smoothly and stably through the elastic support of the cover elastic support part (150), and when the fluid transfer of the valve body (110) is blocked, the opening / closing control disc (135) can seal the valve seat (116).

[0039] The valve steam section (131) has one end inserted into the steam operation sealing hole (121) and coupled with the positioner (133), and the other end penetrates the bonnet cover (140) and is exposed to the outside of the bonnet cover (140) so that the elastic force adjustment section (170) can be coupled. A fastening screw section (131a) to which the elastic force adjustment section (170) is fastened can be formed on the outer surface of the other end of the valve steam section (131), and the valve can be opened and closed by moving due to the fluid pressure generated in the positioner operation space (113).

[0040] Additionally, the valve steam part (131) has a fastening screw part (131a) formed protrudingly so that a positioner (133) can be coupled to one end, and can be inserted into the steam operation sealing hole part (121) so as to be sealed. At this time, a plurality of O-ring grooves for coupling O-rings can be formed on the inner surface of the steam operation sealing hole part (121).

[0041] The positioner (133) is connected to the inner surface of the positioner operating space (113) so as to be sealable by having an O-ring attached along its outer surface, and can move together with the valve steam part (131) in the positioner operating space (113). At this time, the upper and lower sides of the positioner (133) can be maintained at the same pressure as the fluid pressure conveyed through the valve body (110).

[0042] Additionally, the positioner (133) may have a steam coupling groove (133a) formed so that a fastening screw portion (131a) is coupled to the central portion, and a disc fixing hole portion (133b) for seating an opening / closing control disc (135) may be formed through the steam coupling groove (133a).

[0043] The opening / closing control disc (135) is fixed to the positioner (133) and can selectively open / close or adjust the degree of opening / closing of the valve seat (116) of the valve body (110) according to the movement of the valve steam part (131). It can be formed with a slope such that its diameter gradually decreases so that opening / closing operation is performed while being inserted into the interior of the valve steam part (131). The opening / closing control disc (135) can penetrate the positioner (133) so that it is seated in the disc fixing hole part (133b) of the positioner (133), and the sloped part can be exposed to the outside of the positioner (133).

[0044] In particular, the opening / closing control disc (135) can be fixed in close contact with the positioner (133) by a valve steam portion (131) that is coupled with the positioner (133). To this end, the opening / closing control disc (135) may include an expansion protrusion (135a) that is seated in the disc fixing hole portion (133b) and a tapered portion (135b) that is formed to extend taperedly from the expansion protrusion (135a), and the tapered portion (135b) may be inserted into the interior of the valve seat (116). Additionally, the opening / closing control disc (135) may be fixed in close contact with the positioner (133) by the expansion protrusion (135a) by a fastening screw portion (131a).

[0045] The bonnet cover (140) according to the present embodiment is coupled to the bonnet portion (120) to seal the spring installation space portion (123), and can selectively press the cover elastic support portion (150) according to the operation of the elastic force adjustment portion (170). At this time, the bonnet cover (140) can be selectively moved from the bonnet portion (120) by the cover elastic support portion (150). Through this, the elastic force of the cover elastic support portion (150) can be adjusted.

[0046] This bonnet cover (140) is sealed with the bonnet portion (120), and a steam penetration hole (141) may be formed in the center to allow passage of the valve steam portion (131). Additionally, the bonnet cover (140) may be elastically supported by a cover elastic support portion (150).

[0047] In this embodiment, another cover elastic support member (150) is provided in a spring installation space (123) to elastically support the valve steam member (131) in the longitudinal direction of the valve steam member (131), and elastically supports the bonnet cover (140). Then, as the elastic force of the cover elastic support member (150) supporting the bonnet cover (140) is transmitted through the bonnet cover (140) to the elastic force adjustment member (170), the valve steam member (131) can be elastically supported.

[0048] To this end, the cover elastic support member (150) may include a cover support spring (151), a first spring mounting member (153), a second spring mounting member (155), and a cover rotation guide bearing (157), and both ends of the cover support spring (151) may be supported by the first spring mounting member (153) and the second spring mounting member (155), respectively.

[0049] A cover support spring (151) is provided in a spring installation space (123) to elastically support the bonnet cover (140), and both ends can be supported by a first spring mounting part (153) and a second spring mounting part (155), respectively.

[0050] The first spring mounting part (153) is mounted inside the bonnet part (120) so that the valve steam part (131) passes through it, and can support one end of the cover support spring (151).

[0051] The second spring mounting portion (155) is mounted on the other end of the cover support spring (151) so that the valve steam portion (131) passes through it, and can be supported on the bonnet cover (140) by being combined with the cover rotation guide bearing (157). At this time, the second spring mounting portion (155) can be spaced apart from the valve steam portion (131) and the bonnet cover (140).

[0052] A cover rotation guide bearing (157) may be provided between the second spring mounting part (155) and the bonnet cover (140) to prevent the rotational force of the bonnet cover (140), which rotates according to the operation of the elastic force adjustment part (170), from being transmitted to the cover support spring (151). At this time, the cover rotation guide bearing (157) may be coupled to the second spring mounting part (155) and fixed to the bonnet cover (140). This cover rotation guide bearing (157) can guide the rotation of the bonnet cover (140) to prevent the rotational force of the bonnet cover (140) from being transmitted to the cover support spring (151) through the second spring mounting part (155).

[0053] The elastic force adjustment part (170) according to the present embodiment can be coupled to the valve steam part (130) of the valve opening / closing part (130) so as to adjust the elastic pressure of the cover support spring (151) of the cover elastic support part (150).

[0054] This elastic force adjustment part (170) may include an adjustment screw part (171) formed at the other end of the valve steam part (131), a cover support nut part (173) coupled to the adjustment screw part (171) to be supported by the bonnet cover (140), and a position adjustment cap part (175) coupled to the bonnet cover (140) to rotate the cover support nut part (173) and the bonnet cover (140). At this time, the position adjustment cap part (175) may be tightly fixed to the cover support nut part (173) by a set screw. Through this, the position adjustment cap part (175) and the cover support nut part (173) can rotate together.

[0055] The cover support nut portion (173) can support the bonnet cover (140) by rotating it from the adjustment screw portion (171) by the position adjustment cap portion (175) and move it along the longitudinal direction of the valve steam portion (131).

[0056] The position adjustment cap portion (175) forms an internal space to seal the adjustment screw portion (171) and the cover support nut portion (173), and can be coupled to the bonnet cover (140) and supported by the cover support nut portion (173). The position adjustment cap portion (175) can move the position of the bonnet cover (140) by rotating it together with the cover support nut portion (173). At this time, a male screw may be formed on the bonnet cover (140), and a female screw may be formed on the inner surface of the position adjustment cap portion (175).

[0057] The fluid pressure control unit (160) according to the present embodiment may be provided in the fluid pressure control hole (114) of the valve body (110) so as to selectively control the amount of fluid transferred through the fluid supply hole (111), and may control the degree of opening and closing of the fluid supply hole (111).

[0058] To this end, the fluid pressure regulating unit (160) may include a plug installation hole portion (161) formed in the valve body (110), a pressure regulating guide block (163) that is sealingly coupled to the plug installation hole portion (161), a nozzle plug (165) that is movably coupled to the pressure regulating guide block (163), and a nozzle cap portion (167) that is coupled to the pressure regulating guide block (163) to cover the nozzle plug (165). The degree of opening of the fluid pressure regulating hole portion (114) can be adjusted by rotating the nozzle plug (165) of the fluid pressure regulating unit (160). Through this, the amount of fluid transferred through the fluid pressure regulating hole portion (114) is adjusted, thereby allowing the fluid pressure to be regulated.

[0059] A plug installation hole (161) may be formed in the valve body (110) to communicate with a fluid pressure control hole (114). At this time, the fluid pressure control hole (114) may be formed to communicate with a positioner operating space (113) and a fluid supply hole (111). For example, the fluid pressure control hole (114) may be formed vertically.

[0060] The pressure regulating guide block (163) is sealedly coupled to the plug installation hole portion (161), and a regulating hole portion (163a) may be formed through the central portion, and a nozzle plug (165) may be coupled to the regulating hole portion (163a). For example, the pressure regulating guide block (163) may have male screws (163b) formed on the outer surfaces of one end and the other end, respectively, and a tool mounting protrusion (163c) for fastening a tool may be formed protrudingly in the central portion. At this time, a female screw may be formed on the inner surface of the plug installation hole portion (161) to be fastened and fixed to the pressure regulating guide block (163). Additionally, a regulating guide female screw portion (163a') for positioning the nozzle plug (165) may be formed on a part of the inner surface of the regulating hole portion (163a).

[0061] The nozzle plug (165) may have a nozzle pin portion (165a) extended at one end and inserted into a fluid pressure regulating hole portion (114), and the other end located on the outside of a pressure regulating guide block (163), and may have a position regulating screw portion (165b) formed in the center that is fastened to a regulating guide female screw portion (163a') of the regulating hole portion (163a) so as to be movable along the regulating hole portion (163a) through rotation. After the position of the nozzle plug (165) is adjusted, it may be covered by a nozzle cap portion (167).

[0062] Additionally, the nozzle plug (165) may have a polygonal portion (165c) protruding from the other end for mounting a tool, and the space between the other end and the adjustment hole portion (163a) may be sealed. Furthermore, the nozzle pin portion (165a) may be formed protruding from the nozzle plug (165) in a wedge shape.

[0063] The purge control valve (100) for a power plant according to the present invention, configured as described above, can improve the operational safety of the valve steam part (131) because the valve opening / closing part (130) is elastically supported by a cover support spring (151) and at the same time the upper and lower parts of the positioner (133) can be maintained in a dynamic pressure state.

[0064] In addition, the purge control valve (100) for a power plant according to the present invention can adjust the pressure of the fluid being transported through the fluid supply hole (111) by means of a fluid pressure control unit (160), so it can be used under various types of fluids and pressure conditions, and can transport the fluid while maintaining the pressure of the adjusted fluid stably. This improves convenience of use.

[0065] In addition, the purge control valve (100) for a power plant according to the present invention can prevent the rotational force of the elastic force adjustment part (170) from being transmitted to the cover support spring (151) when adjusting the elastic force of the cover elastic support part (150) that supports the valve steam part (131). Therefore, stable and accurate movement of the valve steam part (131) is possible, thereby enabling an accurate pressure control function.

[0066] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0067] Therefore, the true technical scope of protection of the present invention should be determined by the patent claims. Explanation of the symbols

[0069] 100: Purge control valve for power plants 110: Valve body 111: Fluid supply hole 112: Fluid discharge hole 113: Positioner operating space 114: Fluid pressure regulating hole 115: Seat fastening hole 116: Valve seat 117: Dynamic pressure maintaining hole section 120: Bonnet section 121 : Spring installation space 123 : Spring installation space 125: Guide bushing 130: Valve opening / closing part 131: Valve steam part 131a: Fastening screw 133: Positioner 133a: Steam coupling hole 133b : Disc fixing hole 135 : Open / close control disc 135a: Expanded protrusion 135b: Tapered section 140 : Bonnet cover 141 : Steam penetration hole 150: Cover elastic support part 151: Cover support spring part 153: First spring mounting part 155: Second spring mounting part 157: Cover rotation guide bearing 160: Fluid pressure regulator 161: Plug installation hole 163: Pressure regulating guide block 163a: Adjustment hole 165: Nozzle plug 165a: Nozzle pin section 165b: Position adjustment screw section 167: Nozzle cap part 170: Elasticity adjustment part 171: Adjustment screw part 173: Cover support nut part 175 : Position adjustment cap

Claims

Claim 1 A valve body having a fluid supply hole and a fluid discharge hole formed for supplying and discharging fluid, respectively, and a fluid pressure regulating hole communicating with the fluid discharge hole; a bonnet part coupled to the valve body via a bolt to form a positioner operating space and having a steam operating sealing hole and a spring installation space; a valve opening / closing part movably installed on the bonnet part to selectively open / close the fluid discharge hole or adjust the degree of opening / closing of the fluid discharge hole according to fluid pressure, and having a positioner inserted into the positioner operating space; a bonnet cover coupled to the bonnet part to seal the spring installation space and having a steam penetration hole for installing the valve opening / closing part; and a cover elastic support part provided in the spring installation space to elastically support the valve opening / closing part and elastically support the bonnet cover. A purge control valve for a power plant characterized by including: a fluid pressure control unit provided in the valve body to selectively control the amount of fluid transferred through the fluid supply hole portion and to control the degree of opening and closing of the fluid supply hole portion. Claim 2 A purge control valve for a power plant according to claim 1, wherein the valve body has a seat fastening hole formed perpendicular to the fluid discharge hole, a valve seat is coupled to the seat fastening hole, and the valve seat is opened and closed by the valve opening / closing part. Claim 3 A purge control valve for a power plant according to claim 1, further comprising: an elastic force adjustment part coupled to the valve opening / closing part to adjust the elastic pressure of the cover elastic support part; wherein the elastic force adjustment part comprises: an adjustment screw part formed on the valve opening / closing part; a cover support nut part coupled to the adjustment screw part to support the bonnet cover; and a position adjustment cap part coupled to the bonnet cover to seal the adjustment screw part and the cover support nut part, supported by the cover support nut part, and moving the position of the bonnet cover as the cover support nut part is rotated through rotation. Claim 4 In claim 3, the valve opening / closing portion comprises: a valve steam portion having one end positioned in the positioner operating space and inserted into the steam operating sealing hole so as to be coupled with the positioner, and having the adjusting screw portion formed at the other end so as to be exposed to the outside of the bonnet cover through the steam penetration hole portion; and an opening / closing control disc coupled to the positioner to selectively open / close the valve seat of the valve body according to the movement of the valve steam portion, and formed at an angle so as to be inserted into the interior of the valve steam portion; wherein the opening / closing control disc penetrates the positioner so as to be seated in the disc fixing hole portion of the positioner, and is fixed in close contact with the positioner as the positioner and the valve steam portion are coupled to each other. Claim 5 In claim 3, the cover elastic support member comprises: a cover support spring disposed in the spring installation space to elastically support the bonnet cover; a first spring mounting part provided in the bonnet portion to allow the valve opening / closing part to pass through and to support one end of the cover support spring; a second spring mounting part to support the other end of the cover support spring to allow the valve opening / closing part to pass through; and a cover rotation guide bearing provided between the second spring mounting part and the bonnet cover to guide the rotation of the bonnet cover so as not to transmit the rotational force of the bonnet cover, which rotates according to the operation of the elastic force adjustment part, to the cover support spring. This characterizes a purge control valve for a power plant. Claim 6 In claim 3, the fluid pressure regulating part comprises: a plug installation hole portion formed in the valve body to communicate with the fluid pressure regulating hole portion; a pressure regulating guide block that is sealably coupled to the plug installation hole portion and has a regulating hole portion formed through its center; a nozzle plug having a nozzle pin portion extended at one end to be inserted into the fluid pressure regulating hole portion, a other end located on the outside of the pressure regulating guide block, and a position regulating screw portion formed in its center to be fastened to the regulating hole portion so as to move along the regulating hole portion through rotation; and a nozzle cap portion coupled to the pressure regulating guide block to cover the nozzle plug; characterized in that it is a purge control valve for a power plant.

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