Pressure limiting valve
By designing the combination of the pressure limiting valve moving mechanism and O-ring and flat gasket, the problem of fixed pressure threshold of the pressure limiting valve is solved, and the pressure threshold is adjustable, which improves the applicability and system safety of the pressure limiting valve.
Patent Information
- Application Number
- CN202422647155.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The existing pressure limiting valve pressure threshold is fixed, making it difficult to adjust according to the use scenario.
A pressure limiting valve is designed, including a housing, a screw plug and a moving mechanism. The moving mechanism is composed of a bushing, a return spring, a piston assembly and a valve. Through the sliding connection between the piston assembly and the screw plug and the action of the return spring, dynamic pressure adjustment is achieved. Combined with the design of the O-ring and a flat washer, the friction force is reduced and the movement direction of the piston assembly is limited.
The pressure threshold value of the pressure limiting valve is adjusted, which improves the applicability and safety of the pressure limiting valve and ensures the stable operation of the system in different scenarios.
Smart Images
Figure CN223191081U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pressure limiting valves, and particularly relates to a pressure limiting valve. Background Art
[0002] A limiting valve is a device used to limit the internal pressure of a pipeline or a container. It reduces the internal pressure by exhausting air through an exhaust hole, thereby preventing the pressure from continuing to rise and ensuring the safe operation of the system. There are various types of pressure limiting valves, including those in the fuel system, lubrication system, pressure limiting valves on the water tank cover and fuel tank cover, and pressure limiting valves in the hydraulic lifting system. The basic structures and working principles of these pressure limiting valves are similar, except for the installation positions and working media.
[0003] However, for the existing limiting valves, the pressure threshold is fixed and it is difficult to adjust according to the usage scenarios. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a pressure limiting valve, which solves the problem that for the existing limiting valves, the pressure threshold is fixed and it is difficult to adjust according to the usage scenarios.
[0005] To achieve the above purpose, the utility model provides a pressure limiting valve, which includes a housing, a plug, and a moving mechanism. The plug is threadedly connected to the housing and is located on one side of the housing. The moving mechanism includes a bushing, a return spring, a piston assembly, and a valve. The bushing is slidably connected to the housing and is located inside the housing. One end of the return spring contacts the bushing, and the other end of the return spring is fixedly connected to the piston assembly. One end of the piston assembly is disposed inside the housing, and the other end of the piston assembly is slidably connected to the plug. The valve is fixedly connected to the plug and is located on one side of the piston assembly.
[0006] Wherein, the pressure limiting valve further includes an O-ring. A groove is provided on the surface of the piston assembly, and the O-ring is disposed inside the groove.
[0007] Wherein, the pressure limiting valve further includes a rear leather cup and a flat washer. The flat washer is wrapped around the surface of the piston assembly and is located on one side of the plug. The rear leather cup is wrapped around the surface of the piston assembly and is located on one side of the flat washer.
[0008] Wherein, a piston inlet is provided at one end of the piston assembly, and an outlet is provided at one end of the plug.
[0009] A pressure limiting valve of the present utility model, wherein the bushing is slidably connected to the housing and is located inside the housing. One end of the return spring contacts the bushing, and the other end of the return spring is fixedly connected to the piston assembly. One end of the piston assembly is arranged inside the housing, and the other end of the piston assembly is slidably connected to the plug. The valve is fixedly connected to the plug and is located on one side of the piston assembly. In the static state, the piston assembly abuts against the valve under the elastic force of the return spring. The piston assembly is similar to a check valve. During braking, the brake fluid flows into the piston assembly under the action of pressure, pushing the brake fluid to move to the right and flowing in the direction of the plug. Since the gap between the piston assembly and the plug is small, a flow difference will be formed during pressure transmission, and an expansion force will be generated inside. When the expansion force inside the piston assembly is greater than the elastic force of the return spring, the piston assembly will be pushed to the left under the action of the expansion pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0011] Figure 1 It is a cross-sectional view of the pressure limiting valve of the present utility model.
[0012] 1 - housing, 2 - plug, 3 - bushing, 4 - return spring, 5 - outlet, 6 - valve, 7 - piston assembly, 8 - O-ring, 9 - groove, 10 - rear leather cup, 11 - flat washer, 12 - piston inlet. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] The following will describe the embodiments of the present utility model in detail. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation of the present utility model.
[0014] Please refer to Figure 1, the present utility model provides a pressure limiting valve, which includes a housing 1, a plug 2 and a moving mechanism. The plug 2 is threadedly connected to the housing 1 and is located on one side of the housing 1. The moving mechanism includes a bushing 3, a return spring 4, a piston assembly 7 and a valve 6. The bushing 3 is slidably connected to the housing 1 and is located inside the housing 1. One end of the return spring 4 contacts the bushing 3, and the other end of the return spring 4 is fixedly connected to the piston assembly 7. One end of the piston assembly 7 is arranged inside the housing 1, and the other end of the piston assembly 7 is slidably connected to the plug 2. The valve 6 is fixedly connected to the plug 2 and is located on one side of the piston assembly 7.
[0015] In this embodiment, in the static state, the piston assembly 7 abuts against the valve 6 under the elastic force of the return spring 4. The piston assembly 7 is similar to a check valve. During braking, the brake fluid flows into the piston assembly 7 from the piston assembly 7 under the action of pressure, pushing the brake fluid to move to the right and flowing in the direction of the plug 2. Since the gap between the piston assembly 7 and the plug 2 is small, a flow difference will be formed during pressure transmission, and an expansion force will be generated inside. When the expansion force inside the piston assembly 7 is greater than the elastic force of the return spring 4, the piston assembly 7 will be pushed to the left under the action of the expansion pressure.
[0016] Furthermore, the pressure limiting valve further includes an O-ring 8. A groove 9 is provided on the surface of the piston assembly 7, and the O-ring 8 is arranged inside the groove 9.
[0017] In this embodiment, when the piston assembly 7 moves, the O-ring 8 is extruded from the plug 2, reducing the friction between the piston assembly 7 and the plug 2, and at the same time restricting the moving direction of the piston assembly 7.
[0018] Furthermore, the pressure limiting valve further includes a rear leather cup 10 and a flat washer 11. The flat washer 11 is wrapped around the surface of the piston assembly 7 and is located on one side of the plug 2. The rear leather cup 10 is wrapped around the surface of the piston assembly 7 and is located on one side of the flat washer 11.
[0019] In this embodiment, the rear leather cup 10 and the flat washer 11 limit the piston assembly 7. When the piston assembly 7 moves, it prevents the piston assembly 7 and the piston assembly 7 from exerting too much pressure on the valve 6.
[0020] Furthermore, a piston inlet 12 is provided at one end of the piston assembly 7, and an outlet 5 is provided at one end of the plug 2.
[0021] In this embodiment, the brake fluid moves to the right through the piston inlet 12 and flows in the direction of the outlet 5.
[0022] The above-disclosed is only a preferred embodiment of the present utility model. Of course, it cannot be used to limit the scope of rights of the present utility model. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present utility model still fall within the scope covered by the utility model.
Claims
1. A pressure limiting valve, comprising a housing and a screw plug, wherein the screw plug is threadedly connected to the housing and is located on one side of the housing, characterized in that: It also includes a moving mechanism, which includes a bushing, a return spring, a piston assembly and a valve. The bushing is slidably connected to the housing and is located inside the housing. One end of the return spring contacts the bushing, and the other end of the return spring is fixedly connected to the piston assembly. One end of the piston assembly is arranged inside the housing, and the other end of the piston assembly is slidably connected to the screw plug. The valve is fixedly connected to the screw plug and is located on one side of the piston assembly.
2. The pressure limiting valve according to claim 1, characterized in that The pressure limiting valve further includes an O-ring. A groove is provided on the surface of the piston assembly, and the O-ring is arranged inside the groove.
3. The pressure limiting valve according to claim 2, characterized in that The pressure limiting valve further includes a rear leather cup and a flat washer. The flat washer is coated on the surface of the piston assembly and is located on one side of the screw plug. The rear leather cup is coated on the surface of the piston assembly and is located on one side of the flat washer.
4. The pressure limiting valve according to claim 3, characterized in that One end of the piston assembly is provided with a piston inlet, and one end of the screw plug is provided with an outlet.