Adjustable pressure reducing valve sealing structure

Abstract

The utility model relates to the technical field of pressure reducing valves, and discloses an adjustable pressure reducing valve sealing structure. The adjustable pressure reducing valve sealing structure comprises a lower valve body and a piston, the end of the piston extends into the lower valve body, a spring is arranged between the valve body and the piston, an adjustable valve seat assembly used for inputting a pressure medium is installed in the lower valve body in a threaded mode, and a medium circulation opening is formed between the end of the piston and the adjustable valve seat assembly. The adjustable valve seat assembly and the valve body are fixed through a screw. The pressure reducing valve has the advantages of flexibility, application range expansion, cost effectiveness and the like due to the adjustable outlet pressure design. The design is particularly suitable for occasions where customized adjustment needs to be carried out according to specific application conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure reducing valves, in particular to an adjustable pressure reducing valve sealing structure. Background Art

[0002] The fixed-value pressure reducing valve changes the outlet pressure by adjusting the position of the valve seat, thereby controlling pressure loss and ultimately maintaining the outlet pressure at a stable level. By adjusting the spring preload, different outlet pressure values ​​can be set to meet the needs of different applications.

[0003] The outlet pressure of a fluid is a critical parameter of a pressure reducing valve, directly affecting the velocity and pressure loss of the fluid passing through the valve. Outlet pressure is determined by several factors, but the distance between the piston and the valve seat, all other conditions being equal, determines the outlet pressure.

[0004] Currently, the fixed installation method of the valve seat results in a fixed outlet pressure of a single pressure reducing valve, which has a limited practical range. Different models of pressure reducing valves need to be designed for different application scenarios, which leads to high production costs. Utility Model Content

[0005] In order to solve the above technical problems, an embodiment of the present utility model provides an adjustable pressure reducing valve sealing structure, including a lower valve body and a piston whose end extends into the interior of the lower valve body, a spring is provided between the lower valve body and the piston, an adjustable valve seat assembly for inputting pressure medium is threadedly installed in the lower valve body, a medium flow opening is formed between the end of the piston and the adjustable valve seat assembly, and the adjustable valve seat assembly is fixed to the lower valve body by screws.

[0006] Furthermore, the adjustable valve seat assembly includes a valve seat, a seal and a sealing press. The valve seat is threadedly installed in the lower valve body. The seal is fixed to the valve seat through the sealing press, and the seal cooperates with the piston.

[0007] Furthermore, a plurality of circumferentially distributed through holes are provided on the valve seat, half of the through holes are input holes for inputting pressure medium, and the other half of the through holes are adjustment holes for installing screws.

[0008] Furthermore, an assembly groove is provided on the valve seat, and the sealing member is arranged in the assembly groove. The sealing member is an O-ring, a gasket or a sealing material.

[0009] Furthermore, the assembly groove is a sealing sink groove or a sealing fitting groove.

[0010] Furthermore, the sealing pressure piece is a pin, and the pin is connected to the valve seat.

[0011] Furthermore, the sealing pressure piece is a locking piece composed of a bolt and a nut, the bolt passes through the valve seat and is connected to the nut, and a bolt sealing ring is provided between the nut and the valve seat.

[0012] Furthermore, the piston sleeve is arranged in the upper valve body, and a piston seal 1 is provided between the piston and the upper valve body. The piston seal 1 is embedded in the side wall of the piston or the side wall of the upper valve body.

[0013] Furthermore, a second piston seal is provided between the piston and the lower valve body, and the second piston seal is embedded in the side wall of the piston or the side wall of the lower valve body.

[0014] Beneficial effects achieved by this utility model:

[0015] The valve seat of the utility model is threadedly mounted on the lower valve body, and the maximum distance between the valve seat and the piston can be adjusted as needed, thereby achieving adjustable outlet pressure. This adjustable design enables the pressure reducing valve to adapt to different fluid types, flow requirements, and pressure conditions. Users can easily adjust the gap between the valve seat and the piston according to fluids of different viscosities or densities without having to replace the valve or perform complex settings, thereby expanding the range of use of the valve. A pressure reducing valve with adjustable outlet pressure can cover a variety of application requirements, reduce the number of spare parts required, and reduce production costs. In addition, the adjustable design of the valve seat can compensate for seal loss and extend the service life of the valve.

[0016] In summary, the adjustable outlet pressure design offers multiple advantages for pressure reducing valves, including flexibility, expanded applicability, and cost-effectiveness. This design is particularly suitable for applications that require customized adjustments based on specific application conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a structural diagram of the utility model in embodiment 1;

[0019] Figure 2 This is a schematic structural diagram of the second embodiment of the present invention;

[0020] Figure 3 This is a schematic structural diagram of the utility model in the third embodiment;

[0021] Figure 4 This is a schematic structural diagram of the fourth embodiment of the present invention;

[0022] Figure 5 This is a schematic structural diagram of the utility model in the fifth embodiment;

[0023] Figure 6 It is a structural diagram of the utility model in embodiment 6.

[0024] Explanation of the accompanying reference numerals: 1. Lower valve body; 2. Valve seat; 21. Adjustment hole; 22. Input hole; 23. Sealing groove; 24. Sealing fitting groove; 3. Pin; 31. Bolt; 32. Nut; 33. Bolt sealing ring; 4. O-ring; 41. Washer; 42. Sealing material; 5. Screw; 6. Piston; 7. Spring; 8. Upper valve body; 91. Piston seal 1; 92. Piston seal 2. DETAILED DESCRIPTION

[0025] 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.

[0026] In order to solve the above technical problems, an embodiment of the present utility model provides an adjustable pressure reducing valve sealing structure.

[0027] Embodiment 1: This embodiment provides an adjustable pressure reducing valve sealing structure.

[0028] like Figure 1 As shown, an adjustable pressure reducing valve sealing structure includes a lower valve body 1 and a piston 6 whose end extends into the interior of the lower valve body 1, a spring 7 is provided between the lower valve body 1 and the piston 6, an adjustable valve seat assembly for inputting pressure medium is installed on the internal thread of the lower valve body 1, a medium flow opening is formed between the end of the piston 6 and the adjustable valve seat assembly, and the adjustable valve seat assembly is fixed to the lower valve body 1 by screws 5.

[0029] The adjustable valve seat assembly includes a valve seat 2, a seal and a sealing press. The valve seat 2 is threadedly installed in the lower valve body 1. The seal is fixed to the valve seat 2 through the sealing press. The seal cooperates with the piston 6.

[0030] The valve seat 2 of the utility model is threadedly mounted on the lower valve body 1, and the maximum distance between the valve seat 2 and the piston 6 can be adjusted as needed, thereby achieving adjustable outlet pressure. This adjustable design enables the pressure reducing valve to adapt to different fluid types, flow requirements, and pressure conditions. Users can easily adjust the distance between the valve seat and the piston according to fluids of different viscosities or densities without having to replace the valve or perform complex settings, thereby expanding the range of use of the valve. A pressure reducing valve with adjustable outlet pressure can cover a variety of application requirements, reduce the number of spare parts required, and reduce production costs. In addition, the adjustable design of the valve seat can compensate for seal loss and extend the service life of the valve.

[0031] The valve seat 2 is provided with a plurality of circumferentially distributed through holes, half of which are input holes 22 for inputting pressure medium, and the other half of which are adjustment holes 21 for mounting screws 5. Specifically, there are six through holes, of which the adjustment holes 21 and the input holes 22 are staggered.

[0032] When the inlet pressure and flow rate remain unchanged, the pressure medium enters the chamber formed between the valve seat 2 and the lower valve body 1 from the input hole 22. After passing through the medium flow opening, the flow area of ​​the medium is reduced, which will cause pressure loss, making the outlet pressure lower than the inlet pressure, thereby achieving a pressure reduction effect.

[0033] When the pressure at the medium outlet is equal to the sum of the force of the spring 7 and the pressure at the medium inlet, the system in the structure reaches stability, thereby achieving the goal of keeping the outlet pressure stable within a certain range.

[0034] When the inlet pressure increases, the force on the spring 7 will increase, and the spring 7 compresses the piston 6 downward. The opening at the interface between the end of the piston 6 and the O-ring 4 decreases, the pressure loss increases, and the outlet pressure decreases. When dynamic equilibrium is reached in the system, the outlet pressure remains stable within a certain range.

[0035] In particular, because the valve seat 2 is threadedly connected to the lower valve body 1 , it is necessary to introduce a screw 5 to lock the installation position of the valve seat 2 to improve the installation stability of the adjustable valve seat assembly.

[0036] The valve seat 2 has a sealing groove 23, an O-ring 4 as the sealing element, and a pin 3 as the sealing pressure element, which is connected to the valve seat 2. The O-ring 4 is set in the sealing groove 23 and is pressed by the pin 3. The O-ring 4 cooperates with the end of the piston 6, forming an opening for medium flow between the two.

[0037] The piston 6 is sleeved in the upper valve body 8. A piston seal 91 is provided between the piston 6 and the upper valve body 8. The piston seal 91 is embedded in the side wall of the piston 6 or the side wall of the upper valve body 8.

[0038] A second piston seal 92 is provided between the piston 6 and the lower valve body 1 , and the second piston seal 92 is embedded in the side wall of the lower valve body 1 .

[0039] Example 2: The sealing structure provided in this embodiment is based on most of the structural features of Example 1, such as Figure 1 and Figure 2 As shown, the difference is that the piston seal 2 92 is embedded in the outer wall of the piston 6.

[0040] The piston seal 2 92 is installed in the outer side wall of the piston 6 for ease of production and maintenance. Directly installing the seal on the piston can simplify the assembly process and reduce the possibility of installation errors.

[0041] Example 3: This embodiment provides a sealing structure based on the different adjustable valve seat assembly structures in Example 1 or Example 2, such as Figure 1 、 Figure 2 and Figure 3 As shown, the valve seat 2 of the adjustable valve seat assembly is provided with a sealing recess 23, a sealing member is a gasket 41, and a sealing pressing member is a pin 3. The gasket 41 is disposed within the sealing recess 23, and the pin 3 is connected to the valve seat 2 and presses the gasket 41, forming an opening for medium flow between the gasket 41 and the piston 6.

[0042] Compared to the O-ring 4 in Example 1, the gasket 41 in this embodiment affects sealing performance and applicable operating conditions. Specifically, the gasket 41 is more stable in high-temperature or corrosive environments. It also has lower economic costs and better sealing performance that can adapt to irregular surfaces.

[0043] Example 4: This embodiment provides a sealing structure based on the different adjustable valve seat assembly structures in Example 1 or Example 2, such as Figure 1 、 Figure 2 and Figure 4 As shown, the valve seat 2 of the adjustable valve seat assembly is provided with a sealing recess 23. The sealing member is a sealant 42, and the sealing pressure member is a pin 3. The sealant 42 is disposed within the sealing recess 23. The pin 3 is connected to the valve seat 2 and presses against the gasket 41, forming an opening for medium flow between the sealant 42 and the piston 6. The material of the sealant 42 depends on the operating conditions.

[0044] The sealant 42 fits the sealing groove 23 more easily because its shape can be adapted to the contour of the sealing groove, providing better sealing performance. The material of the sealant 42 can be selected according to specific working conditions, and can better cope with high temperature, high pressure or corrosive environment, thereby improving the sealing effect.

[0045] Example 5: The sealing structure provided in this embodiment is based on the embodiment of the different adjustable valve seat assembly structures in Example 1 or Example 2, such as Figure 1 、 Figure 2 and Figure 5 As shown, a sealing groove 23 is provided on the valve seat 2 of the adjustable valve seat assembly, the sealing member is an O-ring 4, and the sealing pressure member is a locking member composed of a bolt 31 and a nut 32. The O-ring 4 is arranged in the sealing groove 23, the bolt 31 passes through the valve seat 2 and is connected to the nut 32. The bolt 31 presses the O-ring 4, and a bolt sealing ring 33 is provided between the nut 32 and the valve seat 2.

[0046] The use of bolts 31 and nuts 32 makes it easier to adjust the tightness of the O-ring 4, thereby better controlling the sealing performance. This allows users to fine-tune the seal according to actual needs to achieve the optimal sealing effect. In addition, the connection between bolts 31 and nuts 32 makes it easier to replace the seal ring. Compared with the first embodiment, there is no need to remove the pin 3; only the nut 32 needs to be loosened to complete the replacement. However, the disadvantage is that the connection between bolts 31 and nuts 32 increases the leakage point. In particular, if the bolt seal 33 between the nut 32 and the valve seat 2 is improperly installed, there is a higher risk of leakage.

[0047] Example 6: This embodiment provides a sealing structure based on the embodiment of the different adjustable valve seat assembly structures in Example 1 or Example 2, such as Figure 1 、 Figure 2 and Figure 6 As shown, the valve seat 2 of the adjustable valve seat assembly is provided with a sealing groove 24. The sealing element is an O-ring 4, and the sealing pressure element is a pin 3. The pin 3 has a pressure edge on the top to enhance the pressure of the pin 3 on the O-ring 4. The sidewalls of the sealing groove 24 are arc-shaped, which ensures a high degree of fit between the O-ring 4 and the sealing groove 24. The arc-shaped design of the sealing groove 24 helps to improve the fit between the O-ring 4 and the groove wall, thereby providing a better sealing effect.

[0048] In summary, when using Examples 1 to 6, the required pressure value is first obtained according to the working conditions, and then the relative position of the valve seat 2 and the lower valve body 1 is adjusted by threading. After the adjustment is completed, the screw 5 is installed in the adjustment hole 21 and abutted against the lower valve body 1 to ensure the stable installation of the valve seat 2.

[0049] 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. An adjustable pressure reducing valve sealing structure, comprising a lower valve body (1) and a piston (6) whose end extends into the interior of the lower valve body (1), a spring (7) being provided between the lower valve body (1) and the piston (6), characterized in that: The lower valve body (1) is internally threaded with an adjustable valve seat assembly for inputting a pressure medium, a medium flow opening is formed between the end of the piston (6) and the adjustable valve seat assembly, and the adjustable valve seat assembly is fixed to the lower valve body (1) by screws (5); The adjustable valve seat assembly comprises a valve seat (2), a sealing member and a sealing pressing member, wherein the valve seat (2) is threadedly mounted in the lower valve body (1), the sealing member is fixed to the valve seat (2) via the sealing pressing member, and the sealing member cooperates with the piston (6).

2. The adjustable pressure reducing valve sealing structure according to claim 1, characterized in that: The valve seat (2) is provided with a plurality of circumferentially distributed through holes, half of which are input holes (22) for inputting pressure medium, and the other half of which are adjustment holes (21) for mounting screws (5).

3. The adjustable pressure reducing valve sealing structure according to claim 1, characterized in that: An assembly groove is provided on the valve seat (2), and the sealing member is arranged in the assembly groove. The sealing member is an O-type sealing ring (4) or a gasket (41) or a sealing material (42).

4. The adjustable pressure reducing valve sealing structure according to claim 3, characterized in that: The assembly groove is a sealing sink groove (23) or a sealing fitting groove (24).

5. The adjustable pressure reducing valve sealing structure according to claim 1, characterized in that: The sealing pressing piece is a pin (3), and the pin (3) is connected to the valve seat (2).

6. The adjustable pressure reducing valve sealing structure according to claim 1, characterized in that: The sealing pressing piece is a locking piece composed of a bolt (31) and a nut (32). The bolt (31) passes through the valve seat (2) and is connected to the nut (32). A bolt sealing ring (33) is provided between the nut (32) and the valve seat (2).

7. The adjustable pressure reducing valve sealing structure according to claim 1, characterized in that: The piston (6) is sleeved in the upper valve body (8), and a piston seal (91) is provided between the piston (6) and the upper valve body (8). The piston seal (91) is embedded in the side wall of the piston (6) or the side wall of the upper valve body (8).

8. The adjustable pressure reducing valve sealing structure according to claim 1, characterized in that: A second piston seal (92) is provided between the piston (6) and the lower valve body (1), and the second piston seal (92) is embedded in the side wall of the piston (6) or the side wall of the lower valve body (1).

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