High-pressure reducing valve

Abstract

The utility model relates to the technical field of pressure reducing valves, and discloses a high-pressure pressure reducing valve. The pressure reducing valve comprises an inlet valve body and an outlet valve body which are in threaded connection, a piston is movably arranged between the inlet valve body and the outlet valve body, the piston is sleeved with a spring used for resisting external pressure changes, an air inlet assembly and a supporting guide piece are sequentially installed in the inlet valve body in the medium circulation direction, and a seal is arranged between the air inlet assembly and the inlet valve body. Seals are arranged between the piston and the outlet valve body and between the piston and the supporting guide piece. According to the utility model, the supporting and guiding piece is additionally arranged and is used for supporting and limiting the movement of the piston, so that the stability of the piston during sealing movement is improved, the deviation loss of the sealing piece is relieved, the service life of the sealing piece is prolonged, and the operation stability of the valve is improved. In addition, due to the combined design and the installation and quick connection mode of the air inlet assembly, the installation and maintenance processes of the valve are simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure reducing valves, in particular to a high-pressure pressure reducing valve. Background Art

[0002] A high-pressure pressure reducing valve is a pressure reducing device specifically designed for use in high-pressure systems. Its primary function is to reduce the pressure of fluid passing through the valve from a higher inlet pressure to a set, lower outlet pressure, preventing excessive pressure from damaging downstream equipment or pipelines. This type of pressure reducing valve is commonly used in industrial processes requiring precise pressure control, such as petrochemicals, natural gas transmission systems, power plants, and various other applications requiring high-pressure pressure reduction.

[0003] In existing technology, when the downstream pressure of a pressure reducing valve deviates from the set value, the piston rod is acted upon by a spring to regulate the opening of the throttling zone. In terms of structural design, a longer piston rod can more evenly transmit the spring force, thereby improving valve operational stability. However, manufacturing and installation defects of the piston rod can cause it to err. When the piston rod errs, the long stroke of the piston rod can exacerbate erroneous pressure and wear on the seal, thus shortening the service life of the pressure reducing valve. Utility Model Content

[0004] The purpose of the utility model is to provide a high-pressure pressure reducing valve, which makes the piston rod run more smoothly and reduces the loss of the seal caused by the movement of the piston rod, that is, to provide a pressure reducing valve with stable sealing and long service life.

[0005] In order to solve the above technical problems, an embodiment of the present utility model provides a high-pressure pressure reducing valve, including an inlet valve body and an outlet valve body connected by threads, and a piston is movably provided between the inlet valve body and the outlet valve body, and is characterized in that an air intake assembly and a support guide are sequentially installed in the inlet valve body along the medium flow direction, a seal is provided between the air intake assembly and the inlet valve body, the end of the piston passes through the support guide and cooperates with the valve disc in the air intake assembly, seals are provided between the piston and the outlet valve body and the support guide, and a spring is provided between the support guide and the piston for regulating the opening at the interface between the piston end and the valve disc.

[0006] Furthermore, the inlet valve body is sequentially provided with a lower threaded cavity, a support cavity and an upper threaded cavity along the medium flow direction, the air inlet assembly is threadedly connected in the lower threaded cavity, the support guide is threadedly installed in the support cavity, the outlet valve body is threadedly connected in the upper threaded cavity, and an oblique flow channel that passes through the outside is provided in the threaded cavity.

[0007] Furthermore, a throttling chamber is provided between the lower threaded chamber and the supporting chamber of the inlet valve body, the end of the air inlet assembly extends into the throttling chamber, the end of the piston extends into the throttling chamber, and a throttling area is formed between the valve disc of the air inlet assembly and the piston.

[0008] Furthermore, a support seal is provided on the bottom surface of the support cavity for sealing between the inlet valve body and the support guide.

[0009] Furthermore, the piston includes an integrally manufactured plug head and plug rod, and a plug head seal is provided on the side wall of the plug head for sealing between the piston and the outlet valve body. The end of the plug rod passes through the support guide and cooperates with the air inlet assembly. The end of the plug rod is a conical structure, and a passage structure is provided on the conical structure.

[0010] Furthermore, a plug rod seal is provided on the inner wall of the support guide, and the plug rod seal is used for sealing between the support guide and the piston. A gasket groove is provided on the end face of the support guide, and the spring rests on the gasket groove.

[0011] Furthermore, a plurality of tooling holes are provided in the gasket groove.

[0012] Furthermore, the air inlet assembly includes a threaded sleeve, a valve flap and a top screw. The threaded sleeve is threadedly installed in the lower threaded cavity, the valve flap is installed inside the threaded sleeve by a boss limiter, and the top screw is threadedly connected to the inner wall of the threaded sleeve and rests on the valve flap.

[0013] Furthermore, a sleeve seal is provided on the outer wall of the threaded sleeve for sealing between the air inlet assembly and the inlet valve body, and a valve flap seal is provided at the contact position between the valve flap and the boss of the threaded sleeve.

[0014] Furthermore, a set screw is installed on the inlet valve body for fixing the connection between the inlet valve body and the outlet valve body (2).

[0015] Beneficial Effects: This new design incorporates a support guide that supports and limits the movement of the piston, improving the stability of the piston seal during movement, alleviating seal deflection wear, extending the seal's service life, and improving valve operational stability. Furthermore, the combined design of the air inlet assembly and its quick-connect installation method simplify valve installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0019] Figure 3 It is a cross-sectional view of the inlet valve body of the utility model;

[0020] Figure 4 It is a cross-sectional view of the air inlet assembly in the utility model;

[0021] Figure 5 It is a cross-sectional view of the support guide member in the utility model;

[0022] Figure 6 It is a cross-sectional view of the piston in the utility model.

[0023] Explanation of the accompanying drawings: 1. Inlet valve body; 12. Lower threaded chamber; 13. Throttle chamber; 14. Support chamber; 15. Upper threaded chamber; 16. Support seal; 17. Inclined flow channel; 2. Outlet valve body; 3. Air inlet assembly; 31. Threaded sleeve; 32. Sleeve seal; 33. Valve disc seal; 34. Valve disc; 35. Top screw; 36. Positioning bolt; 4. Support guide; 41. Gasket groove; 42. Tooling hole; 43. Plug rod seal; 5. Spring; 6. Piston; 61. Plug; 62. Plug rod; 63. Passage structure; 64. Plug seal; 7. Throttle area; 8. Set screw. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to facilitate a better understanding of the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the claims of this application can be achieved.

[0025] In order to solve the above technical problems, an embodiment of the present utility model provides a high-pressure pressure reducing valve.

[0026] like Figures 1-6 As shown, a high-pressure pressure reducing valve includes an inlet valve body 1 and an outlet valve body 2 that are threadedly connected, a piston 6 is movably provided between the inlet valve body 1 and the outlet valve body 2, and a spring 5 is mounted on the piston 6 to resist changes in external pressure. An air inlet assembly 3 and a support guide 4 are sequentially installed in the inlet valve body 1 along the direction of medium flow, a seal is provided between the air inlet assembly 3 and the inlet valve body 1, and a seal is provided between the piston 6 and the outlet valve body 2 and the support guide 4.

[0027] The inlet assembly 3 of this utility model ensures a good seal between the inlet assembly 3 and the inlet valve body 1 by providing an external seal (sleeve seal 32) and an internal seal (valve flap seal 33). Furthermore, the inlet assembly 3 is a removable assembly, allowing for easy maintenance and replacement, reducing downtime. The support guide 4 improves the operational stability of the piston 6, reduces the biasing pressure and wear of the piston rod 62 on the seal, and ensures that the sealing ability between the piston 6 and the support guide 4 is effectively maintained over time, which plays a significant role in extending the life of the pressure reducing valve.

[0028] In summary, the improvements of the present invention not only improve the operational stability of the high-pressure pressure reducing valve, but also extend the service life of the seal, thereby improving the overall performance and reliability of the valve.

[0029] like Figure 1-Figure 3 As shown, the inlet valve body 1 is provided with a lower threaded cavity 12, a support cavity 14 and an upper threaded cavity 15 in sequence along the medium flow direction, the air inlet assembly 3 is threadedly connected in the lower threaded cavity 12, the support guide 4 is threadedly installed in the support cavity 14, the outlet valve body 2 is threadedly connected in the upper threaded cavity 15, and an oblique flow channel 17 that passes through the outside is provided in the threaded cavity 15.

[0030] The lower threaded chamber 12, the support chamber 14 and the upper threaded chamber 15 are all internally threaded chambers. The inlet valve body 1 is connected to the air inlet assembly 3, the support guide 4 and the outlet valve body 2 respectively through the above threaded structure. The threaded connection method simplifies the installation and disassembly process of each functional component and facilitates on-site maintenance and replacement. It can be seen from the above description that the structural design of the inlet valve body 1 not only ensures a stable connection between the various parts of the valve, but also simplifies the installation and maintenance process of the valve through the threaded connection method. The inclined flow channel 17 is connected to the outside atmosphere. When the piston 6 moves between the inlet valve body 1 and the outlet valve body 2, the inclined flow channel 17 is used to avoid the generation of pressure difference in the threaded chamber 15.

[0031] like Figure 3 As shown, a support seal 16 is provided on the bottom surface of the support cavity 14, which is used to seal between the inlet valve body 1 and the support guide 4. The support seal 16 is deformed by the downward threading of the support guide 4, thereby achieving a seal between the support guide 4 and the inlet valve body 1. The shape of the support seal 16 does not change significantly during use of the pressure reducing valve, ensuring a stable sealing effect.

[0032] like Figure 2-Figure 3 As shown, a throttling chamber 13 is provided between the lower threaded chamber 12 and the support chamber 14 of the inlet valve body 1. The end of the air inlet assembly 3 extends into the throttling chamber 13, and the end of the piston 6 extends into the throttling chamber 13. A throttling area 7 is formed between the valve disc 34 of the air inlet assembly 3 and the piston 6. The throttling area 7 provides a movable space for the piston 6 to adjust the pressure when the upstream and downstream pressures of the pressure reducing valve exceed the original set value.

[0033] Specifically, such as Figure 2 and Figure 6 As shown, the piston 6 includes an integrally manufactured plug head 61 and a plug rod 62. The side wall of the plug head 61 is provided with a plug head seal 64 for sealing between the piston 6 and the outlet valve body 2. The end of the plug rod 62 passes through the support guide 4 and cooperates with the air inlet assembly 3. The end of the plug rod 62 is a conical structure, and a passage structure 63 is provided on the conical structure.

[0034] In the initial state, the piston 6 is subjected to a downward force, and a seal is formed between the conical surface of the piston 6 and the valve disc 34, achieving locking. When the outlet is opened and flow passes through, the force on the piston 6 will decrease, the piston 6 moves upward, and the throttling area 7 opens. When equilibrium is reached, the pressure is stable.

[0035] If the upstream pressure suddenly increases, exceeding the set point, the increased pressure acts on piston 6. Piston 6 moves downward, compressing spring 5 and reducing throttling area 7. As throttling area 7 decreases, the flow rate of the medium passing through it decreases, causing the downstream pressure to gradually decrease until a new equilibrium point is reached. When the downstream pressure approaches the set point again, piston 6 stops moving, and throttling area 7 remains at a new stable size, thereby maintaining a stable downstream pressure.

[0036] On the contrary, if the upstream pressure suddenly decreases, the piston 6 moves upward, the spring 5 stretches, and the throttling area 7 increases. The increase in the throttling area 7 allows more medium to pass through, and the downstream pressure increases accordingly. The piston 6 moves to a new position, and the downstream pressure stabilizes near the set value.

[0037] The design of the throttle chamber 13 and throttle area 7 provides space for piston 6 to move, enabling it to adjust pressure as upstream and downstream pressures fluctuate. The structure of piston 6 ensures a seal between piston 6 and outlet valve body 2. Furthermore, the tapered structure of plug rod 62 and the design of passageway structure 63 enable piston 6 to precisely adjust the size of throttle area 7 as pressure changes, thereby achieving a stable pressure reduction effect.

[0038] like Figure 2 and Figure 5 As shown, the inner wall of the support guide 4 is provided with a plug stem seal 43, which is used to seal between the support guide 4 and the piston 6. A gasket groove 41 is defined on the end face of the support guide 4, against which the spring 5 abuts. Because the support guide 4 is assembled deep within the inlet valve body 1 and is threaded, a special tool is required for assembly. During assembly of the support guide 4, the tool can be inserted into the gasket groove 41 through the tooling hole 42, thereby rotating the support guide 4 for threaded connection with the inlet valve body 1, ensuring proper installation of the support guide 4.

[0039] like Figure 2-Figure 4As shown, the air inlet assembly 3 includes a threaded sleeve 31, a valve disc 34 and a top screw 35. The threaded sleeve 31 is threadedly installed in the lower threaded cavity 12, and the valve disc 34 is installed inside the threaded sleeve 31 through a boss limiter. The top screw 35 is threadedly connected to the inner wall of the threaded sleeve 31 and rests on the valve disc 34.

[0040] The outer wall of the threaded sleeve 31 is provided with a sleeve seal 32, which seals between the air intake assembly 3 and the inlet valve body 1. A valve flap seal 33 is provided at the contact point between the valve flap 34 and the boss of the threaded sleeve 31. Because the top screw 35 squeezes and positions the valve flap 34, the valve flap seal 33 does not move relative to it. Its deformation during operation is minimal, resulting in minimal wear on the valve flap seal 33. The sleeve seal 32 operates in the same manner as the valve flap seal 33. These two components involved in sealing the air intake assembly 3 provide stable performance and high sealing performance. This improved sealing performance allows the pressure reducing valve to respond more quickly to pressure changes, thereby enhancing its response speed and control accuracy.

[0041] Specifically, according to different gas media, the valve flap 34 can be made of different materials, mainly plastic and metal.

[0042] like Figure 1 As shown, a set screw 8 is installed on the inlet valve body 1 to fix the connection between the inlet valve body 1 and the outlet valve body (2). A positioning bolt 36 is also installed on the inlet valve body 1, and the positioning bolt 36 passes through the inlet valve body 1 and acts on the threaded pipe sleeve 31.

[0043] The set screw 8 ensures a secure connection between the inlet valve body 1 and the outlet valve body 2, reducing loosening due to vibration or pressure fluctuations and improving the overall stability of the valve. The positioning bolt 36 secures the position of the threaded sleeve 31, ensuring the correct position of the valve disc 34 and preventing poor sealing due to positional fluctuations. Furthermore, the design of the positioning bolt 36 allows for fine-tuning of the position of the threaded sleeve 31 as needed, facilitating maintenance and adjustment.

[0044] In particular, the support seal 16, sleeve seal 32, valve disc seal 33, plug rod seal 43 and plug head seal 64 used in the present invention are all O-rings. The installation positions of these seals are divided into side wall installation and end face installation. Side wall installation requires an installation groove to be opened on the installation wall, and end face installation requires a corresponding installation boss.

[0045] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A high-pressure pressure reducing valve, comprising an inlet valve body (1) and an outlet valve body (2) connected by threads, wherein a piston (6) is movably provided between the inlet valve body (1) and the outlet valve body (2), characterized in that: An air inlet assembly (3) and a supporting guide (4) are sequentially installed in the inlet valve body (1) along the medium flow direction. A seal is provided between the air inlet assembly (3) and the inlet valve body (1). The end of the piston (6) passes through the supporting guide (4) and cooperates with the valve disc (34) in the air inlet assembly (3). Seals are provided between the piston (6), the outlet valve body (2) and the supporting guide (4). A spring (5) is provided between the supporting guide (4) and the piston (6) for regulating the opening at the interface between the end of the piston (6) and the valve disc (34).

2. A high pressure reducing valve according to claim 1, characterized in that: The inlet valve body (1) is provided with a lower threaded cavity (12), a support cavity (14) and an upper threaded cavity (15) in sequence along the medium flow direction; the air inlet assembly (3) is threadedly connected in the lower threaded cavity (12); the support guide (4) is threadedly installed in the support cavity (14); the outlet valve body (2) is threadedly connected in the upper threaded cavity (15); and an oblique flow channel (17) that penetrates the outside is provided in the threaded cavity (15).

3. A high pressure reducing valve according to claim 2, characterized in that: The air inlet assembly (3) comprises a threaded sleeve (31), a valve flap (34) and a top screw (35); the threaded sleeve (31) is threadedly mounted in the lower threaded cavity (12); the valve flap (34) is positioned inside the threaded sleeve (31) by a boss; and the top screw (35) is threadedly connected to the inner wall of the threaded sleeve (31) and rests against the valve flap (34).

4. A high pressure reducing valve according to claim 3, characterized in that: The outer wall of the threaded sleeve (31) is provided with a sleeve seal (32) for sealing between the air inlet assembly (3) and the inlet valve body (1); the contact position of the valve flap (34) with the boss of the threaded sleeve (31) is provided with a valve flap seal (33).

5. A high pressure reducing valve according to claim 2, characterized in that: A throttling chamber (13) is provided between the lower threaded chamber (12) and the supporting chamber (14) of the inlet valve body (1); the end of the air inlet assembly (3) extends into the throttling chamber (13); the end of the piston (6) extends into the throttling chamber (13); and a throttling area (7) is formed between the valve disc (34) of the air inlet assembly (3) and the piston (6).

6. A high pressure reducing valve according to claim 2, characterized in that: The bottom surface of the support cavity (14) is provided with a support seal (16) for sealing between the inlet valve body (1) and the support guide (4).

7. The high-pressure pressure reducing valve according to claim 1, characterized in that: The piston (6) comprises an integrally manufactured plug head (61) and a plug rod (62). A plug head seal (64) is provided on the side wall of the plug head (61) for sealing between the piston (6) and the outlet valve body (2). The end of the plug rod (62) passes through the support guide (4) and cooperates with the air inlet assembly (3). The end of the plug rod (62) is a conical structure, and a passage structure (63) is provided on the conical structure.

8. A high pressure reducing valve according to claim 7, characterized in that: The inner wall of the support guide (4) is provided with a plug rod seal (43), and the plug rod seal (43) is used for sealing between the support guide (4) and the piston (6). The end surface of the support guide (4) is provided with a gasket groove (41), and the spring (5) abuts against the gasket groove (41).

9. A high pressure reducing valve according to claim 8, characterized in that: A plurality of tooling holes (42) are provided in the pad groove (41).

10. The high-pressure pressure reducing valve according to claim 1, characterized in that: A set screw (8) is installed on the inlet valve body (1) for fixing the connection between the inlet valve body (1) and the outlet valve body (2).

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