A gas pressure regulator with shut-off and built-in balancing valve

Abstract

This utility model discloses a gas pressure regulator with a shut-off valve and a built-in balancing valve, including a main valve body, a main regulating valve body, a balancing valve assembly, and a shut-off valve body. The balancing valve assembly is installed on the main valve body, and the main regulating valve body and the shut-off valve body are fixedly connected to the main valve body. The main valve body is internally divided into an inlet chamber and an outlet chamber by a partition, and a main valve port is provided on the partition between the inlet chamber and the outlet chamber. The main valve body has a first connection port, and a second connection port is provided on the other end opposite to the first connection port. The shut-off valve body is fixedly connected to the second connection port by a shut-off flange, and a shut-off valve gasket connected to the shut-off valve body by a shut-off valve stem can abut against the main valve port. The main regulating valve body has a third connection port, which is axially connected to the first connection port and fixedly connected by a clamp on its outer periphery. The balancing valve assembly is installed on the inner periphery of the first connection port, and the valve core in the balancing valve assembly can abut against the main valve port. This utility model has a simple and compact structure, is easy to disassemble and install, is easy to adjust, and has stable and safe performance.

Description

Technical Field

[0001] This utility model relates to the field of gas transmission and distribution equipment technology, and in particular to a gas pressure regulator with a shut-off valve and a built-in balancing valve. Background Technology

[0002] Gas pressure regulators are core equipment in gas transmission and distribution systems and are widely used in gas transmission and distribution projects. Their main function is to automatically regulate the outlet pressure of gas, ensuring that the outlet pressure remains stable within a set range through pressure reduction and stabilization, meeting user needs, and enabling downstream gas-consuming equipment to obtain a stable and safe gas supply.

[0003] Under normal operating conditions, the existing pressure regulator introduces the pressure downstream of the signal tube into the lower chamber of the main diaphragm of the pressure regulator. The gas pressure in the lower chamber of the main diaphragm is balanced with the main spring of the pressure regulator. The main regulating valve assembly drives the valve pad on the valve stem to move back and forth. The distance between the valve pad on the valve core and the main valve port increases or decreases, thereby adjusting the outlet pressure of the pressure regulator.

[0004] Gas pressure regulators are typically used with shut-off valves when adjusting outlet pressure. This can improve gas supply safety by either having a built-in shut-off valve or adding a separate one. However, existing gas pressure regulators often use bolts to secure the shut-off valve, preventing axial rotation between the valve body and the main valve body and limiting installation flexibility and applicability.

[0005] Therefore, this utility model provides a new technical solution to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a gas pressure regulator with a shut-off valve and a built-in balance valve. The regulator has a simple and compact structure, is easy to disassemble and install, is easy to adjust, and has stable and safe performance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A gas pressure regulator with a shut-off valve and a built-in balancing valve includes a main valve body, a main regulating valve body, a balancing valve assembly, and a shut-off valve body. The balancing valve assembly is installed on the main valve body, and the main regulating valve body and the shut-off valve body are fixedly connected to the main valve body.

[0009] The main valve body is divided into an inlet chamber and an outlet chamber by a partition, and the partition between the inlet chamber and the outlet chamber is provided with a main valve port.

[0010] The main valve body has a connection port one at the end facing the main control valve body and the main valve port, and a connection port two at the other end of the main valve body opposite to the connection port one.

[0011] The main control valve body has a third connection port facing the first connection port. The third connection port is axially connected to the first connection port, and the outer periphery is fixedly connected with a clamp.

[0012] The shut-off valve body is connected to a shut-off valve stem. The shut-off valve body is fixedly connected to the connection port 2 of the main valve body through a connecting flange. The shut-off valve stem passes through the inside of the connecting flange and is fixedly connected to a shut-off valve gasket at its end. The shut-off valve gasket can abut against the main valve port.

[0013] The balance valve assembly is installed on the inner circumference of the connection port one. The valve core in the balance valve assembly can abut against the main valve port. The valve core is equipped with a valve stem, which can extend into the body cavity of the main regulating valve and be movably connected to the main regulating valve assembly.

[0014] The present invention is further configured such that: an annular protrusion 1 is provided on the outer periphery of the first connection port; an annular protrusion 2 is provided on the outer periphery of the third connection port; an annular boss 1 and an annular boss 2 are integrally connected to the end face 1 of the annular protrusion 1; an annular groove 1 and an annular groove 2 are provided on the end face 2 of the annular protrusion 2; the annular boss 1 can be embedded in the annular groove 1; the annular boss 2 can be embedded in the annular groove 2; the end face 1 and the end face 2 abut against each other; and the end face 3 of the annular boss 2 abuts against and limits the end face 4 of the annular groove 2.

[0015] The present invention is further configured such that the clamp has a ring structure and includes two fasteners, which are sleeved on the outer periphery of the first and second annular protrusions and fastened by bolts.

[0016] The present invention is further configured such that the outer periphery of the first annular protrusion and the second annular protrusion are respectively provided with a conical surface and a conical surface; the fastener is provided with a conical groove, and a conical surface is formed on both sides of the conical groove. The outer periphery of the first annular protrusion and the second annular protrusion is embedded in the conical groove, and the first conical surface and the second conical surface abut against and limit the position of the third conical surface.

[0017] The present invention is further configured such that two connecting parts are integrally connected at both ends of the outer periphery of the fastener, the two fasteners are arranged in a symmetrical structure, and the connecting parts on the two fasteners are fixedly connected by bolts.

[0018] The present invention is further configured such that a gap is reserved between the first annular boss and the first annular groove, and a sealing ring is sleeved on the outer periphery of the second annular boss, the sealing ring being embedded in the second annular groove and abutting and limiting the position of the first annular boss.

[0019] The present invention is further configured such that the shut-off valve body has a connection port four facing the connection port two, a connection seat is integrally connected to one end of the connection flange facing the connection port two, and an annular boss three is integrally connected to the other end of the connection seat. The connection seat is partially embedded in the inner circumference of the connection port two and fixedly connected by the connection bolts, and the annular boss three is embedded in the inner circumference of the connection port four of the shut-off valve body and fixedly connected by the fastening screws.

[0020] The present invention is further configured such that the connecting seat has a connecting hole in the axial direction, and an annular boss four is integrally connected to the connecting seat in the direction of the connecting port two. The outer circumference of the annular boss four is embedded in the inner circumference of the connecting port two. One end of the connecting seat facing the connecting port two abuts and limits the connection to the connecting port two, and a connecting bolt is used to pass through the connecting hole and fix it to the main valve body.

[0021] The present invention is further configured such that a radially penetrating fixing hole is provided on the outer periphery of the four connecting ports on the shut-off valve body, and an annular groove is provided on the outer periphery of the three annular bosses. The fastening screw is threadedly connected to the fixing hole and can abut against the inner limit of the annular groove.

[0022] The present invention is further configured such that an annular groove four is formed on the outer periphery of one end of the annular boss three away from the connection port four on the main valve body, and an annular groove five is formed on the outer periphery of the annular boss four, and a sealing ring is embedded in both the annular groove four and the annular groove five.

[0023] The beneficial effects of this utility model are: this utility model combines the pressure regulating valve and the shut-off valve into a whole, combining the two original independent components into one, reducing the number of components, reducing the space occupied by the device, and making it easier for staff to maintain the device. At the same time, it also makes it more reliable and has a faster response capability, more precise control, and increases the effectiveness of the device.

[0024] The connection between the main control valve body and the main valve body, as well as between the shut-off valve body and the main valve body, adopts an easy-to-adjust and easy-to-install connection method. It can be installed at any angle axially according to the environment and user needs, making it more practical and applicable. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of a gas pressure regulator with a shut-off valve and a built-in balance valve in this embodiment.

[0026] Figure 2 This is a cross-sectional view of the connection between the main valve body and the main regulating valve body of a gas pressure regulator with a shut-off and built-in balancing valve in this embodiment.

[0027] Figure 3 for Figure 2 Enlarged view at point B.

[0028] Figure 4 for Figure 2 Explosion diagram at point B.

[0029] Figure 5 This is a schematic diagram of the clamp connection structure in a gas pressure regulator with a cut-off and built-in balance valve in this embodiment.

[0030] Figure 6 for Figure 1 Enlarged view at point A.

[0031] Figure 7 for Figure 1 Sectional view at point A.

[0032] Figure 8 This is a cross-sectional view of the connecting flange in a gas pressure regulator with a shut-off and built-in balancing valve in this embodiment.

[0033] Reference numerals: Main valve body 1; Inlet chamber 11; Outlet chamber 12; Valve port 13; Baffle 14; Connection port 15; Annular protrusion 151; Conical surface 152; End face 153; Annular boss 154; Annular boss 2 155; Connection port 2 16; Main regulating valve body 2; Connection port 3 21; Annular protrusion 211; Conical surface 212; End face 213; Annular groove 1 214; Annular groove 2 215; Connecting cylinder 216; Main regulating valve assembly 22; Balance valve assembly 3; Valve core 31; Valve stem; 32; Top rod; 33; Clamp; 4; Fastener; 41; Conical groove; 411; Conical surface; 412; Connecting part; 42; Bolt; 43; Shut-off valve body; 5; Connecting port; 51; Connecting flange; 52; Connecting seat; 521; Annular boss; 522; Annular boss; 523; Connecting bolt; 524; Fastening screw; 525; Connecting hole; 526; Annular groove; 527; Annular groove; 528; Annular groove; 529; Shut-off valve stem; 53; Shut-off valve gasket; 54; Fixing hole; 55; Sealing ring; 6. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] This embodiment discloses a gas pressure regulator with a shut-off function and a built-in balancing valve, referring to... Figures 1 to 8 As shown, it mainly includes a main valve body 1, a main regulating valve body 2, a balance valve assembly 3, a clamp 4, and a shut-off valve body 5. The balance valve assembly 3 is installed on the main valve body 1. The main valve body 1 and the main regulating valve body 3 are fixedly connected by the clamp 5. The shut-off valve body 5 is connected to the main valve body 1 through a connecting flange 52.

[0036] Reference Figure 2 As shown, the inner cavity of the main valve body 1 is divided into an inlet chamber 11 and an outlet chamber 12 by a partition 14. A main valve port 13 is provided in the partition 14 between the inlet chamber 11 and the outlet chamber 12. A connection port 15 communicating with the outlet chamber 12 is provided at the end of the main valve body 1 facing the main regulating valve body 2 and directly opposite the main valve port 13. A balance valve assembly 3 is installed on the inner circumference of the connection port 15. The valve core 31 in the balance valve assembly 3 can abut against the main valve port 13. A connection port 21 is provided in the direction of the main regulating valve body 2 facing the connection port 15. The connection port 15 and the connection port 21 are axially connected, and the outer circumference of the connection port 15 and the connection port 21 are fixedly connected by a clamp 4. The structure is simple, easy to disassemble, and flexible to install.

[0037] An axially penetrating connecting cylinder 216 is integrally connected to the inner circumference of the connecting port 3 on the main control valve body 2. The valve stem 32 installed on the valve core 31 passes through the connecting cylinder 215. A push rod 33 is threadedly connected to the end of the valve stem 32 away from the main valve port 13. The push rod 33 extends into the inner cavity of the main control valve body 2 and is movably connected to the main control valve assembly 22. The valve stem 32 and the push rod 33 are connected by threads, which can cooperate with the axial flexible adjustment between the main valve body 1 and the main control valve body 2, and realize flexible installation in the direction between the actuator.

[0038] Reference Figure 2 and Figure 3 As shown, an annular protrusion 151 is provided on the outer periphery of the connection port 15 of the main valve body 1, and a tapered surface 152 is provided at the end of the annular protrusion 151 away from the annular protrusion 211; an annular protrusion 211 is provided on the outer periphery of the connection port 21, and a tapered surface 212 is provided at the end of the annular protrusion 211 away from the annular protrusion 151. The annular protrusion 151 and the annular protrusion 211 are sleeved together, wherein the end face 153 of the annular protrusion 151 and the end face 213 of the annular protrusion 211 abut and limit each other.

[0039] Reference Figure 3 and Figure 4As shown, to achieve a sealed connection between the main valve body 1 and the main regulating valve body 2, an annular boss 154 and an annular boss 255 are provided on the end face 153 of the annular protrusion 151, and an annular groove 214 and an annular groove 215 are provided on the end face 211 of the annular protrusion 211. When the connection port 15 of the main valve body 1 and the connection port 21 of the main regulating valve body 2 are axially aligned, the annular protrusion 151 and the annular protrusion 211 are interlocked, so that the annular boss 154 is embedded in the annular groove 214 and the annular boss 255 is embedded in the annular groove 215. The end face 153 of the annular boss 155 abuts against the end face 213 of the annular boss 155, and the end face 156 of the annular groove 215 abuts against the end face 216 of the annular groove 215, forming a limiting installation. An annular sealing ring 6 is fitted around the outer circumference of the annular boss 155. The sealing ring 6 is embedded in the annular groove 215 and abuts against the annular boss 154. Since there is a gap between the end face of the annular boss 154 and the annular groove 214, while maintaining the stability of the connection, the annular boss 154 and the annular groove 215 can compress the sealing ring 6, thereby improving the sealing effect of the sealing ring 6.

[0040] Reference Figure 3 and Figure 5 As shown, the clamp 4 is mainly a ring structure formed by two fasteners 41 with a semi-circular shape. A conical groove 411 is provided on the inner circumference of the fastener 41. The outer diameter of the conical groove 411 is larger than the axial distance between the ends of the annular protrusion 151 and the annular protrusion 211 after they are engaged with each other, so that the ends of the annular protrusion 151 and the annular protrusion 211 can be embedded in the conical groove 411. A conical surface 3 412 is formed on both sides of the conical groove 411. Two connecting parts 42 are integrally connected at both ends of the outer circumference of the fastener 41. The two connecting parts 42 are arranged in a symmetrical structure.

[0041] When two fasteners 41 are symmetrically fitted around the outer periphery of the first annular protrusion 151 and the second annular protrusion 211, the outer periphery of the first annular protrusion 151 and the second annular protrusion 211 are embedded in the conical grooves 411 on the fasteners 41. The conical surface 152 of the first annular protrusion 151 and the conical surface 212 of the second annular protrusion 211 respectively abut and limit the conical surface 512. Then, bolts 43 are used to fix the two connecting parts 42 installed on the two fasteners 41 to achieve a fixed connection between the main valve body 1 and the main regulating valve body 2. The connection structure is simple and has high connection strength. It is easy to disassemble and install. Users can install the main regulating valve body 2 and the main valve body 1 at any angle as needed to achieve convenient operation and maintenance. At the same time, it can also reduce the size of the entire pressure regulating box and reduce manufacturing costs.

[0042] Reference Figure 1As shown, a shut-off device is added to the gas pressure regulator with shut-off and built-in balance valve. A second connection port 16 is provided on the other end of the main valve body 1 opposite to the first connection port 15. The second connection port 16 is connected to the inlet chamber 11. The shut-off valve body 5 is fixedly connected to the second connection port 16 of the main valve body 1 through the connecting flange 52. The shut-off valve body 1 and the connecting flange 52 are nested and fixedly connected by fastening screws 525. The axial connection angle between the shut-off valve body 5 and the main valve body 1 can be adjusted and installed arbitrarily according to the environment and user needs, thereby realizing the convenience of operation and maintenance.

[0043] Reference Figure 6 and Figure 8 As shown, the connecting flange 52 is cylindrical and axially continuous. A connecting seat 521 is integrally connected to the connecting flange 52 in the direction of the connecting port 16 on the main valve body 1. An annular boss 523 is integrally connected to the connecting seat 521 in the direction of the connecting port 16. The outer circumference of the annular boss 523 is embedded in the inner circumference of the connecting port 16. One end of the connecting seat 521 facing the connecting port 16 abuts against and limits the connection. A connecting hole 526 is axially formed on the connecting seat 521. A connecting bolt 524 passes through the connecting hole 526 to fix the connecting flange 52 to the main valve body 1. An annular boss 522 is integrally connected to the other end of the connecting flange 52 relative to the connecting seat 521. The connecting flange 522 is axially connected to the connecting port 16 on the main valve body 1. A connection port 4 51 is provided in the direction of 6. A shut-off valve stem 53 is axially installed on the inner circumference of the connection port 4 51. A radially penetrating fixing hole 55 is provided on the outer circumference of the connection port 4 51. The inner circumference of the connection port 4 51 of the shut-off valve body 5 is fitted onto the outer circumference of the annular boss 3 522 on the connecting flange 52. The shut-off valve stem 53 installed on the shut-off valve body 5 passes through the inner circumference of the connecting flange 52 and extends into the inlet cavity 11 of the main valve body 1. The shut-off valve stem 53 and the connecting flange 52 are sealed together by embedding a sealing ring 6 inside the connecting flange 52. A shut-off valve gasket 54 is fixedly installed at the end of the shut-off valve stem 53 that extends into the inlet cavity 11. The shut-off valve gasket 54 can abut against the main valve port 13 to realize the shut-off function.

[0044] Reference Figure 7 As shown, an annular groove 527 is formed on the outer periphery of the annular boss 522. The fastening screw 525 is threaded into the fixing hole 55. By rotating and adjusting the fastening screw 525, the end of the fastening screw 525 abuts against the inside of the annular groove 527, forming a limiting installation, and fixing the shut-off valve body 5 to the connecting flange 52. Since the shut-off valve body 5 is sleeved on the annular boss 522 on the connecting flange 52 and fixedly connected by the fastening screw 525, the axial connection between the shut-off valve body 5 and the connecting flange 52 can be achieved at any angle by rotating and adjusting the fastening screw 525. It can be installed according to the specific environment and different user needs, making it more practical and applicable.

[0045] Reference Figure 6 and Figure 8 As shown, in order to enhance the sealing performance of the connection between the connecting flange 52 and the shut-off valve body 5 and the main valve body 1, sealing rings 6 are installed at the connection points between the connecting flange 52 and the shut-off valve body 5 and the main valve body 1 respectively. An annular groove 4 528 is formed on the outer periphery of the end of the annular boss 3 522 on the connecting flange 52 away from the connection port 4 51 on the main valve body 1, and an annular groove 529 is formed on the outer periphery of the annular boss 4 523. Sealing rings are embedded in both annular groove 4 528 and annular groove 529, respectively abutting against the inner periphery of the connection port 4 51 on the shut-off valve body 5 and the inner periphery of the connection port 2 16 on the main valve body 1, thereby improving the sealing performance between the connecting flange 52 and the shut-off valve body 5 and the main valve body 1.

[0046] In this embodiment, the sealing method between the components is to install sealing rings 6 at the sealing position. The specific size and shape of the sealing rings 6 are matched according to the specific situation of the sealing position.

[0047] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A gas pressure regulator with cut-off and built-in balance valve, characterized in that, It includes a main valve body (1), a main regulating valve body (2), a balance valve assembly (3) and a shut-off valve body (5), wherein the balance valve assembly (3) is installed on the main valve body (1), and the main regulating valve body (3) and the shut-off valve body (5) are fixedly connected to the main valve body (1); The main valve body (1) is divided into an inlet chamber (11) and an outlet chamber (12) by a partition (14), and the partition (14) between the inlet chamber (11) and the outlet chamber (12) is provided with a main valve port (13); The main valve body (1) has a connection port one (15) at one end facing the main control valve body (2) and the main valve port (13), and a connection port two (16) is opened at the other end of the main valve body (1) relative to the connection port one (15); The main control valve body (4) has a connection port three (21) facing the connection port one (15). The connection port three (21) is axially connected to the connection port one (16), and the outer periphery is fixedly connected by a clamp (4). The shut-off valve body (5) is connected to a shut-off valve stem (53). The shut-off valve body (5) is fixedly connected to the connection port (16) of the main valve body (1) through a connecting flange (52). The shut-off valve stem (53) passes through the connecting flange (52) and is fixedly connected to a shut-off valve pad (54) at its end. The shut-off valve pad (54) can abut against the main valve port (13). The balance valve assembly (2) is installed on the inner periphery of the connection port (15). The valve core (21) in the balance valve assembly (2) can abut against the main valve port (13). The valve core (21) is equipped with a valve stem (22). The valve stem (22) can extend into the inner cavity of the main regulating valve body (4) and be movably connected to the main regulating valve assembly (42).

2. The gas pressure regulator with cut-off and built-in balance valve according to claim 1, characterized in that, The outer periphery of the first connection port (15) is provided with an annular protrusion (151), and the outer periphery of the third connection port (21) is provided with an annular protrusion (211). The end face (153) of the annular protrusion (151) is integrally connected with an annular boss (154) and an annular boss (255). The end face (213) of the annular protrusion (211) is provided with an annular groove (214) and an annular groove (215). The annular boss (154) can be embedded in the annular groove (214), and the annular boss (255) can be embedded in the annular groove (215). The end face (153) abuts against the end face (213), and the end face (3) (156) of the annular boss (255) abuts against and limits the end face (4) (216) of the annular groove (215).

3. A gas pressure regulator with a shut-off valve and a built-in balance valve according to claim 2, characterized in that, The clamp (4) has a ring structure and includes two fasteners (41). The two fasteners (41) are sleeved on the outer periphery of the first ring protrusion (151) and the second ring protrusion (211) and are fastened by bolts (43).

4. A gas pressure regulator with a shut-off valve and a built-in balance valve according to claim 3, characterized in that, The outer periphery of the first annular protrusion (151) and the second annular protrusion (211) are respectively provided with a first conical surface (152) and a second conical surface (212); the fastener (41) is provided with a conical groove (411), and a third conical surface (412) is formed on both sides of the conical groove (411). The outer periphery of the first annular protrusion (151) and the second annular protrusion (211) are embedded in the conical groove (411), and the first conical surface (152) and the second conical surface (212) respectively abut against and limit the third conical surface (412).

5. The gas pressure regulator with cut-off and built-in counterbalance valve according to claim 4, characterized in that, The fastener (41) has two connecting parts (42) integrally connected at both ends of its outer periphery. The two fasteners (41) are arranged in a symmetrical structure, and the connecting parts (42) on the two fasteners (41) are fixedly connected by bolts (43).

6. The gas pressure regulator with cut-off and built-in counterbalance valve according to claim 2, characterized in that, A gap is reserved between the first annular boss (154) and the first annular groove (214). A sealing ring (6) is sleeved on the outer periphery of the second annular boss (155). The sealing ring (6) is embedded in the second annular groove (215) and abuts against and limits the position of the first annular boss (154).

7. The gas pressure regulator with a cut-off and built-in balance valve according to claim 1, characterized in that, The shut-off valve body (5) has a connection port four (51) facing the connection port two (16). The end of the connecting flange (52) facing the connection port two (16) is integrally connected to a connecting seat (521), and the other end of the connecting seat (521) is integrally connected to an annular boss three (522). The connecting seat (521) is partially embedded in the inner circumference of the connection port two (16) and fixedly connected by a connecting bolt (524). The annular boss three (522) is embedded in the inner circumference of the connection port four (51) of the shut-off valve body (5) and fixedly connected by a fastening screw (525).

8. A gas pressure regulator with a shut-off valve and a built-in balance valve according to claim 7, characterized in that, The connecting seat (521) has an axially formed connecting hole (526). The connecting seat (521) is integrally connected with an annular boss (523) facing the connecting port (16). The outer periphery of the annular boss (523) is embedded in the inner periphery of the connecting port (16). One end of the connecting seat (521) facing the connecting port (16) abuts against the connecting port (16) and is limited. A connecting bolt (524) is used to pass through the connecting hole (526) and is fixedly connected to the main valve body (1).

9. The gas pressure regulator with a cut-off and built-in balance valve according to claim 7, characterized in that, The outer periphery of the four connecting ports (51) on the shut-off valve body (5) is provided with a radially penetrating fixing hole (55), and the outer periphery of the three annular bosses (522) is provided with an annular groove (527). The fastening screw (525) is threaded to the fixing hole (55) and can abut against the inner limit of the annular groove (527).

10. The gas pressure regulator with a cut-off and built-in balance valve according to claim 8, characterized in that, The annular boss three (522) has an annular groove four (528) on its outer periphery away from the connection port four (51) on the main valve body (1), and the annular boss four (523) has an annular groove five (529) on its outer periphery. Both the annular groove four (528) and the annular groove five (529) are fitted with sealing rings (6).

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