A balancing valve for a gas pressure regulator

Abstract

This utility model discloses a balancing valve for a gas pressure regulator, comprising a bushing, an end cap, a valve core, a valve gasket, a valve stem, and a balancing diaphragm. One end of the bushing forms an opening, and the other end is fitted with the end cap. The valve core is installed on the inner circumference of the bushing, and the valve gasket is installed on the end of the valve core facing the opening. The balancing diaphragm is annular and installed between the bushing and the valve core. The inner circumference of the balancing diaphragm is sealed to the valve core, and the outer circumference of the balancing diaphragm is sealed to the bushing. The inner circumference of the bushing forms a balancing cavity between the balancing diaphragm and the end cap. The valve core has a through-hole at both ends. One end of the valve stem is installed in the through-hole, and the other end passes through the end cap. A first air hole is axially arranged on the center of the valve stem, with the first air hole extending through to the open end. A second air hole is provided on the valve stem at the position of the balancing cavity, and the first air hole and the second air hole are connected. The balancing valve of this utility model has high pressure regulation accuracy, simple structure, is easy to assemble and maintain, and has strong regulation stability and applicability.

Description

Technical Field

[0001] This utility model relates to the field of balancing valve technology, and in particular to a balancing valve for a gas pressure regulator. Background Technology

[0002] In gas transmission and distribution systems, gas pressure regulators, commonly known as pressure reducing valves, are key devices for controlling gas pressure. Their performance directly affects the safety and stability of gas supply. As the core component of the pressure regulator, the balancing valve is mainly used to balance the inlet and outlet pressures to ensure that the outlet pressure remains stable within the set range.

[0003] Traditional balancing valves operate under high pressure differential conditions, and the valve seat is easily affected by fluctuations in inlet pressure, leading to unstable outlet pressure and insufficient pressure balancing accuracy, which affects the normal operation of downstream gas equipment. Secondly, when the system flow changes abruptly, traditional balancing valves cannot quickly adjust the valve seat position, causing instantaneous pressure fluctuations and even surge phenomena, shortening the valve's service life. Furthermore, some existing balancing valves typically contain many assembly parts, making assembly difficult, maintenance costs high, and reliability and stability relatively low.

[0004] Therefore, this utility model provides a new technical solution to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a balancing valve for a gas pressure regulator. This balancing valve has high pressure regulation accuracy, simple structure, is easy to assemble and maintain, and has strong regulation stability and applicability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A balancing valve for a gas pressure regulator includes a bushing, an end cap, a valve core, a valve gasket, a valve stem, and a balancing diaphragm. One end of the bushing forms an opening, and the other end is fitted with an end cap.

[0008] A valve core is installed on the inner circumference of the bushing, and a valve gasket is installed on the end of the valve core facing the opening.

[0009] The balancing diaphragm is annular and installed between the bushing and the valve core. The inner circumference of the balancing diaphragm is sealed to the valve core, and the outer circumference of the balancing diaphragm is sealed to the bushing. The inner circumference of the bushing corresponds to the balancing cavity formed between the balancing diaphragm and the end cap.

[0010] The valve core has a through-hole at both ends, and one end of the valve stem is installed in the through-hole, while the other end passes through the end cap.

[0011] The valve stem has a central axial air hole 1, which is open at one end. The valve stem has a second air hole 2 located in the balance chamber, and the first air hole 1 and the second air hole 2 are connected.

[0012] The present invention is further configured such that a fixing screw is threadedly connected to one end of the connecting hole near the opening, and the fixing screw has an axially penetrating air hole three, which is connected to an air hole one at the center of the valve stem.

[0013] The present invention is further characterized in that: the valve core has an annular boss II at one end facing the opening, the annular boss II is integrally connected to the outer periphery of the connecting hole, the valve pad is annular and sleeved on the outer periphery of the annular boss II; the outer periphery of the fixing screw is integrally connected to a nut, the nut abutting against the end of the valve pad facing away from the valve core.

[0014] The present invention is further configured such that the valve core has an annular groove at one end facing the opening, the valve pad has an annular protrusion at one end facing the valve core, and the nut has a stepped portion at one end facing the valve pad. The annular protrusion is embedded in the annular groove, and the stepped portion presses against the valve pad for limiting.

[0015] The present invention is further configured to include a sealing seat, the sealing seat including a limiting plate, the end of the limiting plate facing the valve core having an annular boss three integrally connected thereto, the sealing seat being axially sleeved on the valve stem, the outer circumference of the annular boss three being threadedly connected to the valve core, the limiting plate pressing against the balance diaphragm for limiting, and the limiting plate and the balance diaphragm being sealed together.

[0016] The present invention is further configured such that a stepped portion one is provided on the inner circumference of one end of the bushing mounting end cap, an annular boss one is integrally connected to the end of the end cap facing the opening, a stepped portion two is provided at the end of the annular boss one, the outer circumference of the balancing diaphragm is embedded between the stepped portion one and the stepped portion two, and the balancing diaphragm is sealed to both the stepped portion one and the stepped portion two.

[0017] The present invention is further configured such that the valve core extends outward from the outer periphery of the end facing the opening to form a limiting part, and the inner periphery of the end of the bushing near the opening is provided with an annular protrusion, and the end of the limiting part facing away from the opening abuts against the annular protrusion for limiting.

[0018] The present invention is further configured such that the end cap and the valve stem are sealed together by a sealing ring.

[0019] The beneficial effects of this utility model are: the balance valve in this utility model is mainly assembled from bushing, end cover, valve core, valve gasket, valve stem and balance diaphragm, which has a simple structure and is easy to disassemble, assemble and maintain.

[0020] The valve gasket is fitted with an annular protrusion two integrally connected to the valve core. The annular protrusion two on the valve gasket is embedded into the annular groove on the valve core for limiting. Then, the fixing screws threaded to the valve core are used to press against the valve gasket to prevent the valve gasket from shifting, improve the connection strength, and ensure the pressure regulation accuracy and stability of the pressure regulator.

[0021] A balancing diaphragm is installed on the inner circumference of the bushing and embedded between the bushing and the valve core, so that the inner circumference of the bushing corresponds to the balancing diaphragm and the end cap to form a balancing cavity. The effective area of ​​the balancing diaphragm is approximately the same as the area of ​​the opening. The gas flow channel formed by the combination of the valve gasket, fixing screw and valve stem connects to the balancing cavity, so that the pressure on the valve gasket is balanced and offset by the pressure change of the inlet pressure. This ensures that the outlet pressure of the regulator is not affected by the change of the inlet pressure, stabilizes the output outlet pressure, and ensures the safe operation of downstream gas equipment. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the balance valve of a gas pressure regulator in this embodiment.

[0023] Figure 2 This is a partially exploded view of the cross-sectional view of the balance valve of a gas pressure regulator in this embodiment.

[0024] Figure 3 This is a cross-sectional view of the balancing valve adjustment process of a gas pressure regulator in this embodiment.

[0025] Reference numerals: Bushing 1; Opening 11; Stepped portion 12; Annular protrusion 13; End cap 2; Annular boss 1 21; Stepped portion 2 22; Valve core 3; Connecting hole 31; Annular boss 2 32; Annular groove 33; Limiting portion 34; Valve gasket 4; Annular protrusion 2 41; Valve stem 5; Air hole 1 51; Air hole 2 52; Balancing diaphragm 6; Fixing screw 7; Air hole 3 71; Nut 72; Stepped portion 3 73; Sealing seat 8; Limiting plate 81; Annular boss 3 82; Balancing chamber 9; Sealing ring 10. Detailed Implementation

[0026] 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.

[0027] This embodiment discloses a balancing valve for a gas pressure regulator, referring to... Figures 1-3As shown, it mainly includes a bushing 1, an end cap 2, a valve core 3, a valve pad 4, a valve stem 5, and a balancing diaphragm 6. The bushing 1 is cylindrical with an opening 11 at one end and an end cap installed at the other end. The valve core 3 is installed on the inner circumference of the bushing 1, and the valve pad 4 is installed on the end of the valve core 3 facing the opening 11. The balancing diaphragm 6 has an annular structure and is embedded between the bushing 1 and the valve core 3. The inner circumference of the balancing diaphragm 6 is sealed to the valve core 3, and the outer circumference of the balancing diaphragm 6 is sealed to the bushing 1.

[0028] Reference Figure 1 As shown, a stepped portion 12 is provided on the inner circumference of one end of the bushing 1 where the end cap 2 is installed. An annular boss 21 is integrally connected to the end of the end cap 2 facing the opening 11. A stepped portion 22 is provided at the end of the annular boss 21. The balancing diaphragm 6 has an annular structure. The outer circumference of the balancing diaphragm 6 is embedded in the inner circumference of the bushing 1 and can abut against the stepped portion 12. The end cap 2 is fastened to the bushing 1 and connected by a threaded connection. The outer circumference of the annular boss 21 fits against the inner circumference of the stepped portion 12, and the stepped portion 22 abuts against the end of the balancing diaphragm 6 facing away from the opening 11, thereby achieving the limiting installation of the balancing diaphragm 6. In addition, the outer circumference of the balancing diaphragm 6 is embedded between the stepped portion 12 and the stepped portion 22 to achieve a sealed connection.

[0029] Reference Figure 1 As shown, the embodiment of a gas pressure regulator balance valve also includes a sealing seat 8. The sealing seat 8 has a central opening that is axially through and sleeved on the valve stem 5, located between the balance diaphragm 6 and the end cap 2. The sealing seat 8 includes a limiting plate 81 and an annular boss 82 integrally connected to the limiting plate 81. The sealing seat 8 is threaded to the connecting hole 31 on the valve core facing away from the opening 11 through the outer circumference of the annular boss 82. The end of the annular boss 82 can abut against the valve stem 5, so that the limiting plate 81 on the sealing seat 8 can press against the balance diaphragm 6, and the limiting plate 81 and the balance diaphragm 6 are sealed together.

[0030] Reference Figure 1 As shown, after the balance diaphragm 6 is installed, it can divide the inner cavity of the bushing 1 into two chambers. A balance cavity 9 is formed on the inner circumference of the bushing 1 between the balance diaphragm 6 and the end cap 2. The pressure on the valve inlet side can be introduced to the other side of the balance diaphragm 6 through the balance cavity 9, so as to play a balancing role.

[0031] A connecting hole 31 with both ends is provided in the center of the valve core 3. One end of the valve stem 5 is installed in the connecting hole 51, and the other end passes through the end cover 2. A sealing ring is used to seal between the end cover 2 and the valve stem 5. An axially arranged air hole 51 is provided in the center of the valve stem 5. The end of the air hole 51 is open to the opening 11. An air hole 52 communicating with the air hole 51 is provided radially at the position of the valve stem 5 in the balance chamber 9.

[0032] Reference Figure 1 As shown, a fixing screw 7 is threadedly connected to the inner circumference of the connecting hole 31 at the end of the valve core 3 near the opening 11. A through vent 3 71 is axially arranged at the center of the fixing screw 7. The vent 3 71 is connected to the outside in the direction facing the opening 11. The end of the vent 3 71 facing away from the opening 11 is connected to the vent 1 51 arranged at the center of the valve stem 5. This allows the balance chamber 9 formed inside the balance valve to be connected to the outside through the vent 2 52, the vent 1 51 and the vent 3 71, so that it can balance and offset the pressure on the valve pad 4 caused by the change in inlet pressure. This ensures that the outlet pressure of the pressure regulator is not affected by the change in inlet pressure, stabilizes the output pressure, and ensures the safe operation of downstream gas equipment.

[0033] Reference Figure 1 and Figure 2 As shown, an annular boss 32 is provided at the end of the valve core 3 facing the opening 11. The annular boss 32 is integrally connected to the outer periphery of the connecting hole 31. The valve gasket 4 has an annular structure and can be fitted onto the outer periphery of the annular boss 32. A vertical stripe texture structure is provided on the outer periphery of the annular boss 32 to limit the axial rotation of the valve gasket 4. An annular groove 33 is provided at the end of the valve core 3 facing the opening 11, and an annular protrusion 41 is provided at the end of the valve gasket 4 facing the valve core 3. The annular protrusion 41 is embedded in the annular groove 33 to achieve radial limiting of the valve gasket 4. The outer periphery of the fixing screw 7 is integrally connected to the connecting hole 31. A nut 72 is attached, and a stepped portion 73 is provided at the end of the nut 72 facing the valve gasket 4. The stepped portion 73 presses against the end of the valve gasket 4 facing the opening 11. Since the position of the stepped portion 73 pressing against the valve gasket 4 is opposite to the position of the annular protrusion 41 on the valve gasket 4, when the nut 72 on the fixing screw 7 abuts against the fixing valve gasket 4, the position of the stepped portion 73 on the nut 72 will generate a relatively large force to press against the valve gasket 4, so that the annular protrusion 41 on the valve gasket 4 fits tightly in the annular groove 33, preventing displacement, improving the connection strength, and ensuring the pressure regulation accuracy and stability of the pressure regulator.

[0034] Reference Figure 1 and Figure 2 As shown, an annular boss 32 is provided at the end of the valve core 3 facing the opening 11. The annular boss 32 is integrally connected to the outer periphery of the connecting hole 31. The valve gasket 4 has an annular structure and can be fitted onto the outer periphery of the annular boss 32 to achieve radial limiting of the valve gasket 4. A nut 72 is integrally connected to the outer periphery of the fixing screw 7. The outline of the nut 72 is larger than the annular boss 32 and also larger than the inner periphery of the valve gasket 4. When the fixing screw 7 is installed, it extends into the inner periphery of the annular boss 32. The end face of the nut 72 can exert a pressing force on the valve gasket 4, which can restrict the valve gasket 4 between the nut 72, the annular boss 32, and the end face of the valve core 3, thus fixing the valve gasket 4.

[0035] An annular groove 33 is provided at the end of the valve core 3 facing the opening 11, and an annular protrusion 41 is provided at the end of the valve gasket 4 facing the valve core 3. The annular protrusion 41 is embedded in the annular groove 33 to achieve radial limiting of the valve gasket 4. A stepped portion 73 is provided at the end of the nut 72 facing the valve gasket 4. The stepped portion 73 abuts against the end of the valve gasket 4 facing the opening 11. Since the position of the stepped portion 73 abutting against the valve gasket 4 is opposite to the position of the annular protrusion 41 on the valve gasket 4, when the nut 72 on the fixing screw 7 abuts against the fixing valve gasket 4, the position of the stepped portion 73 on the nut 72 will generate a relatively large force to press against the valve gasket 4, so that the annular protrusion 41 on the valve gasket 4 fits tightly in the annular groove 33, preventing displacement, improving connection strength, and ensuring the pressure regulation accuracy and stability of the pressure regulator.

[0036] Furthermore, in order to limit the axial rotation of the valve pad 4, a vertical stripe texture structure can be provided on the outer periphery of the annular boss 32, and a matching recess can also be provided on the valve pad 4. The two fit together and can limit the axial rotation of the valve pad 4.

[0037] Reference Figure 1 and Figure 3 As shown, a limiting part 34 is formed by extending outward from the outer periphery of the valve core 3 facing the opening 11. An annular protrusion 13 is provided on the inner periphery of the bushing 1 near the opening 11. The end of the limiting part 34 facing away from the opening 11 can abut against the annular protrusion 13 to limit the axial movement of the valve core 3 in the bushing 1.

[0038] During the axial movement of the valve core 3 within the bushing 1, it has a retracted state (refer to...). Figure 1 (as shown) and extended state (refer to) Figure 3 (As shown). When the valve core 3 is in the retracted state, the limiting part 34 abuts against the annular protrusion 13, and the end of the valve pad 4 facing the opening 11 is flush with the end of the opening 11. The valve pad 4 can be completely retracted into the inner circumference of the bushing 1, and the pressure on the outer circumference of the valve pad 4 can be reduced to prevent radial compression of the valve pad 4, thus protecting the valve pad 4.

[0039] When the inlet pressure changes, the gas flow channel formed by the valve pad 4, the fixing screw 7 and the valve stem 5 connects to the balance chamber 9. Under pressure drive, the valve core 3 can slide and adjust between the annular protrusion 13 and the end of the opening 11 to balance and offset the pressure on the valve pad 4 caused by the change in inlet pressure. This ensures that the outlet pressure of the regulator is not affected by the change in inlet pressure, stabilizes the outlet pressure, and ensures the safe operation of downstream gas equipment.

[0040] 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 balance valve of a gas pressure regulator, characterized by, Includes bushing (1), end cap (2), valve core (3), valve pad (4), valve stem (5) and balance diaphragm (6), wherein one end of bushing (1) forms an opening (11) and the other end is fitted with end cap (2); A valve core (3) is installed on the inner circumference of the bushing (1), and a valve pad (4) is installed on the end of the valve core (3) facing the opening (11). The balancing diaphragm (6) is annular and is installed between the bushing (1) and the valve core (3). The inner circumference of the balancing diaphragm (6) is sealed to the valve core (3), and the outer circumference of the balancing diaphragm (6) is sealed to the bushing (1). The inner circumference of the bushing (1) corresponds to the balancing cavity (9) formed between the balancing diaphragm (6) and the end cap (2). The valve core (3) has a through-hole (31) at both ends. One end of the valve stem (5) is installed in the through-hole (31), and the other end passes through the end cap (2). The valve stem (5) has a central axial air hole (51) which is open to the end of the opening (11). The valve stem (5) has an air hole (52) at the position of the balance chamber (9). The air hole (51) and the air hole (52) are connected.

2. A gas pressure regulator balance valve according to claim 1, characterised in that The connecting hole (31) is threaded with a fixing screw (7) at one end near the opening (11). The fixing screw (7) has an axially penetrating air hole three (71), which is connected to the air hole one (51) at the center of the valve stem (5).

3. The balancing valve of a gas pressure regulator according to claim 2, characterized in that, The valve core (3) has an annular boss (32) at one end facing the opening (11). The annular boss (32) is integrally connected to the outer periphery of the connecting hole (31). The valve pad (4) is annular and is fitted around the outer periphery of the annular boss (32). The outer periphery of the fixing screw (7) is integrally connected to a nut (72). The nut (72) presses against the end of the valve pad (4) facing away from the valve core (3).

4. The balancing valve of a gas pressure regulator according to claim 3, characterized in that, The valve core (3) has an annular groove (33) at one end facing the opening (11), the valve pad (4) has an annular protrusion (41) at one end facing the valve core (3), and the nut (72) has a stepped portion (73) at one end facing the valve pad (4). The annular protrusion (41) is embedded in the annular groove (33), and the stepped portion (73) presses against the valve pad (4) for positioning.

5. The balancing valve of a gas pressure regulator according to claim 1, characterized in that, It also includes a sealing seat (8), which includes a limiting plate (81). The end of the limiting plate (81) facing the valve core (3) is integrally connected with an annular boss (82). The sealing seat (8) is axially sleeved on the valve stem (5). The outer circumference of the annular boss (82) is threaded to the valve core (3). The limiting plate (81) is pressed against the balance diaphragm (6) for limiting. The limiting plate (81) and the balance diaphragm (6) are sealed together.

6. The balancing valve of a gas pressure regulator according to claim 1, characterized in that, The bushing (1) has a stepped portion one (12) on the inner circumference of the end cap (2) of the bushing (1). The end cap (2) facing the opening (11) is integrally connected with an annular boss one (21). The end of the annular boss one (21) is provided with a stepped portion two (22). The outer circumference of the balancing diaphragm (6) is embedded between the stepped portion one (12) and the stepped portion two (22). The balancing diaphragm (6) is sealed to the stepped portion one (12) and the stepped portion two (22).

7. The balancing valve of a gas pressure regulator according to claim 1, characterized in that, The valve core (3) extends outward from the outer periphery of the end facing the opening (11) to form a limiting part (34). The bushing (1) has an annular protrusion (13) on the inner periphery of the end near the opening (11). The end of the limiting part (34) facing away from the opening (11) abuts against the annular protrusion (13) for limiting.

8. The balancing valve of a gas pressure regulator according to claim 1, characterized in that, The end cap (2) and the valve stem (5) are sealed together by a sealing ring (10).

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