Adjustable unloading valve

Abstract

The utility model discloses an adjustable unloading valve which comprises a three-way main body, a connecting joint, a valve rod and a pressure spring cover, the front-section connector and the rear-section connector are connected with connectors on the two sides of the three-way body respectively, the valve rod is located in the three-way body, the pressure spring cover is located at the outer side end of the rear-section connector, a pressure spring is arranged in the outer side of the rear-section connector, and the end, extending into the rear-section connector, of the valve rod is connected with the cushion block. A guide valve seat and a sealing valve seat are arranged on a rod body, located in the three-way body, of the valve rod, the guide valve seat is located in the three-way body on the side close to the front-section connector, the sealing valve seat is located in the three-way body on the side close to the rear-section connector, and the coaxiality of the valve rod in the three-way body is increased through the guide valve seat. Further, the valve rod axially moves in the three-way main body; according to the utility model, the manufacturing cost and the installation difficulty are reduced; meanwhile, the fluid drift diameter design is more reasonable; and the valve rod is more stable in action and longer in service life in the using process.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid equipment technical field, concretely is a kind of adjustable unloading valve, especially to the improvement design of RV series adjustable unloading valve. BACKGROUND

[0002] In the laboratory, RV series adjustable unloading valve is often used to simulate the outlet back pressure loading condition of fluid equipment in running process, and the market price of this RV series adjustable unloading valve is about 300~350RMB, when facing the fluid equipment of multiple pump cores, sometimes 30 such specifications of unloading valve are required at one time, and the laboratory application is often in the back pressure loading condition of pulse type, the service life of unloading valve is at least 1,000,000 times, the back pressure range is 0~6000psi, after long-time use, unloading valve often cannot load back pressure, and the scrap rate is high. Since the valve rod design of RV series adjustable unloading valve has defects in coaxiality in structure, the valve rod and valve seat are easy to deflect, sealing failure after long-time friction, and due to the limitation of structure, the fluid passage is extremely narrow, and in the case of low fluid purity, it is easy to block. SUMMARY

[0003] The utility model provides a kind of adjustable unloading valve, solve the valve rod design of existing RV series adjustable unloading valve in coaxiality in structure Defects cause valve rod and valve seat are easy to deflect, sealing failure after long-time friction, and due to the limitation of structure, the fluid passage is extremely narrow, and in the case of low fluid purity, it is easy to block the problem.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of adjustable unloading valve, including three-way main body, connecting joint, valve rod and compression spring cover;

[0005] The connecting joint includes front section connecting head and rear section connecting head, the front section connecting head and rear section connecting head are connected with the interfaces on both sides of the three-way main body respectively, the valve rod is located inside the three-way main body, the compression spring cover is located at the outside end of the rear section connecting head, and the compression spring cover and the rear section connecting head are mutually sleeved, the outside inside of the rear section connecting head is provided with a placing cavity, a compression spring is arranged in the placing cavity, one end of the compression spring is connected with the pad provided at the tail end of the valve rod, and the other end is connected with the bottom surface in the compression spring cover, the end of the valve rod inserted into the inside of the rear section connecting head is connected with the pad, and the valve rod is provided with two groups of valve seats on the rod body inside the three-way main body;

[0006] The valve seat comprises a guide valve seat and a sealing valve seat, the guide valve seat is located inside the three-way body near the front section connector, the sealing valve seat is located inside the three-way body near the rear section connector, the coaxiality of the valve rod in the three-way body is increased through the guide valve seat, and then the valve rod moves axially in the three-way body.

[0007] Preferably, a guide sealing ring is arranged around the surface of the guide valve seat, and the guide valve seat and the inner wall of the three-way body are matched through the guide sealing ring.

[0008] Preferably, a rear section sealing ring is arranged around the surface of the sealing valve seat, and the sealing of the fluid in the three-way body is ensured through the rear section sealing ring.

[0009] Preferably, the cushion block moves smoothly in the placing cavity.

[0010] Preferably, the front section connector and the rear section connector are connected to the interfaces on the two sides of the three-way body through the threaded structure.

[0011] Preferably, the compression spring cover and the rear section connector are connected through the threaded structure.

[0012] Compared with the prior art, the utility model has the beneficial effects that: in the utility model, two groups of valve seats are arranged on the valve rod respectively and are respectively assembled with sealing rings to increase the coaxiality, so that the perpendicularity of the valve rod and the valve seat is ensured, that is, the original two-section separately designed body type connection structure is changed into a structure that a conventional three-way is taken as a body and two separately designed connectors are added, in addition, the original radial sealing structure of the valve rod is changed into a radial sealing structure of the valve body and a guide structure is added, so that the manufacturing cost and the installation difficulty are reduced, the fluid passage design is more reasonable, the valve rod is more stable during use and has a longer service life. BRIEF DESCRIPTION OF DRAWINGS

[0013] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation on the utility model.

[0014] In the drawings:

[0015] Figure 1 is the adjustable unloading valve structure of the utility model;

[0016] Figure 2 is the front section connector structure of the utility model;

[0017] Figure 3 is the rear section connector structure of the utility model;

[0018] Figure 4 This is a structural diagram of the compression spring cover of the utility model;

[0019] Figure 5 This is a structural diagram of the valve stem of the utility model;

[0020] Numbers in the figure: 1, front connector; 2, tee connector; 3, rear connector; 4, compression spring cover; 5, guide sealing ring; 6, valve stem; 7, rear sealing ring; 8, gasket; 9, compression spring. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0022] Example: Figures 1-5 As shown, an adjustable unloading valve includes a three-way body, a connecting joint, a valve stem 6 and a compression spring cover 4; the three-way body in this embodiment is a conventional three-way joint 2 with an NPT1 / 4 connecting thread, and the connecting joint is a two-joint structure with an NPT1 / 4 connecting thread, which can be easily disassembled; at the same time, the existing valve stem 6 radial nitrile sealing ring φ2.65x5 is modified to adopt a valve body radial seal and a valve stem 6 guide fluororubber φ1.778x7.65.

[0023] The connecting joint includes a front-section connecting head 1 and a rear-section connecting head 3, and the front-section connecting head 1 and the rear-section connecting head 3 are respectively spirally connected to the interfaces on both sides of the three-way body through a provided threaded structure; the valve stem 6 is located inside the three-way body, the compression spring cover 4 is located at the outer end of the rear-section connecting head 3, and the compression spring cover 4 and the rear-section connecting head 3 are sleeved on each other and spirally connected through a provided threaded structure; a placement cavity is provided inside the outer side of the rear-section connecting head 3, and a compression spring 9 is provided inside the placement cavity, one end of the compression spring 9 is connected to the pad 8 provided at the tail end of the valve stem 6, and the other end is connected to the bottom surface of the compression spring cover 4, the end of the valve stem 6 extending into the interior of the rear-section connecting head 3 is connected to the pad 8, and the pad 8 moves smoothly inside the placement cavity; the valve stem 6 is located inside the three-way body and the rod body is respectively provided with two sets of valve seats;

[0024] The valve seat comprises a guide valve seat and a sealing valve seat, the guide valve seat is located inside the tee body near the front connector 1, a guide sealing ring 5 is arranged around the surface of the guide valve seat, and the guide valve seat and the inner wall of the tee body are matched with each other through the guide sealing ring 5; the sealing valve seat is located inside the tee body near the rear connector 3, a rear sealing ring 7 is arranged around the surface of the sealing valve seat, and the sealing of the fluid inside the tee body is ensured through the rear sealing ring 7; the coaxiality of the valve rod 6 inside the tee body is increased through the guide valve seat, and then the valve rod 6 moves axially inside the tee body.

[0025] Working principle:

[0026] Firstly, the front connector 1 is connected to the tee body, the guide sealing ring 5 and the rear sealing ring 7 are respectively installed on the valve seat of the valve rod 6, the valve rod 6 is integrally installed into the tee body, the rear connector 3 is connected to the other end of the tee body, the gasket 8 and the compression spring 9 are sequentially installed, and finally the compression spring cover 4 is screwed to the outside end of the rear connector 3, so that the assembly of the unloading valve is completed. In normal working condition, the fluid (such as hydraulic oil) in the system enters the valve body from the front connector 1 of the unloading valve. At this time, the compression spring 9 at the rear connector 3 exerts a pre-tightening force on the valve core, so that the valve rod 6 remains in the closed position and blocks the channel of the oil outlet of the tee body to the unloading circuit. The fluid can only flow through the normal working circuit. With the operation of the device system, when the pressure in the device system rises to a certain degree, the unloading valve is triggered to enter the unloading state, the force of the fluid on the valve rod 6 overcomes the pre-tightening force of the compression spring 9, and the valve rod 6 starts to move. In the present application, the coaxiality is increased through the cooperation of the two groups of valve seats, sealing rings and valve rod 6, so as to ensure the perpendicularity of the valve rod 6 and the valve seat, and then the long-term sealing life is ensured. When the valve rod 6 starts to move, the channel of the oil outlet to the unloading circuit is opened. At this time, most of the fluid entering the oil inlet flows back to the oil tank through the unloading circuit, instead of flowing to the actuator, so that the unloading of the system is realized.

[0027] Finally, it should be pointed out that the above description is only a preferred example of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements for some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An adjustable unloader valve characterized by: The utility model relates to a three-way valve, which comprises a three-way body, a connecting joint, a valve rod and a compression spring cover. The connecting joint comprises a front connecting joint and a rear connecting joint, which are connected to the interfaces on the two sides of the three-way body respectively; the valve rod is located inside the three-way body; the compression spring cover is located at the outer side end of the rear connecting joint and is sleeved with the rear connecting joint; an accommodation cavity is arranged inside the outer side of the rear connecting joint; a compression spring is arranged inside the accommodation cavity; one end of the compression spring is connected to a pad arranged at the tail end of the valve rod, and the other end is connected to the bottom surface in the compression spring cover; one end of the valve rod extending into the rear connecting joint is connected to the pad; two groups of valve seats are arranged on the rod body of the valve rod located inside the three-way body. The valve seat comprises a guide valve seat and a sealing valve seat; the guide valve seat is located inside the three-way body near the front connecting joint; the sealing valve seat is located inside the three-way body near the rear connecting joint; the guide valve seat increases the coaxiality of the valve rod inside the three-way body, so that the valve rod moves axially inside the three-way body.

2. An adjustable unloader valve according to claim 1, characterized in that: A guide sealing ring is arranged around the surface of the guide valve seat; the guide sealing ring makes the guide valve seat and the inner wall of the three-way body adhere to each other.

3. An adjustable unloader valve according to claim 1, wherein: A rear sealing ring is arranged around the surface of the sealing valve seat; the rear sealing ring ensures the sealing of the fluid inside the three-way body.

4. An adjustable unloader valve according to claim 1, wherein: The pad moves smoothly inside the accommodation cavity.

5. An adjustable unloader valve according to claim 1 wherein: The front connecting joint and the rear connecting joint are connected to the interfaces on the two sides of the three-way body through the threaded structure.

6. An adjustable unloader valve according to claim 1 wherein: The compression spring cover and the rear connecting joint are connected through the threaded structure.

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