Direct-acting overflow valve for multi-way valve
By using high-hardness gaskets and tapered sealing pairs in the direct-acting relief valve, combined with the pressure adjustment mechanism, the problems of pressure regulating deviation and complex structure of the traditional relief valve are solved, and better sealing and service life are achieved.
Patent Information
- Application Number
- CN202421517908.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-30
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-06-30
AI Technical Summary
The traditional direct-acting relief valve has a large pressure regulation deviation, which leads to leakage of hydraulic oil, and is complex in structure, making it difficult to ensure sealing and service life.
A high-hardness gasket is used in front of the spring seat, combined with a tapered sealing pair, to provide support and enhance sealing, while controlling the opening pressure of the overflow valve through a pressure adjustment mechanism.
It effectively reduces the pressure regulation deviation, enhances the sealing effect, extends the service life, avoids stagnation and oil leakage faults, and ensures the stability and reliability of the overflow valve.
Smart Images
Figure CN222848431U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a direct-acting overflow valve used on a multi-way valve. Background Art
[0002] The direct-acting relief valve is mainly composed of a valve body, a valve core, a pressure regulating spring and a pressure regulating screw (or handle). Under normal conditions, the valve core is tightly attached to the valve seat under the action of the pressure regulating spring, and the oil inlet P and the oil outlet T are blocked (that is, the relief valve is a normally closed type).
[0003] Traditional direct-acting relief valves usually have a large pressure regulation deviation. This is because the valve core in the valve body is conical. The sealing pair formed by this conical valve core and the inner wall of the valve body is usually a linear seal. When the pressure of the hydraulic oil reaches the threshold value of pushing the valve core, the valve core moves, causing a gap in the sealing pair and causing hydraulic oil leakage. Some valve cores are cylindrical. Although the sealing pair formed between it and the inner wall of the valve body is a sealing surface, it can effectively reduce the pressure regulation deviation. However, since there is no support under the cylindrical valve core, a support mechanism needs to be added under the cylinder, which will make the entire structure more complicated. Therefore, a mechanism is needed to reduce the pressure regulation deviation while ensuring the simplicity of the structure. Utility Model Content
[0004] The purpose of the utility model is to solve the above deficiencies in the prior art and to provide a direct-acting overflow valve for a multi-way valve.
[0005] A direct-acting relief valve for a multi-way valve comprises a valve body and a valve core. A chamber is arranged in the valve body, the chamber is connected to an oil outlet and an oil inlet on the valve body, the valve core is used to separate the oil inlet and the oil outlet, the valve core is movably arranged in the chamber, the valve core is located between the oil inlet and the oil outlet, a conical chamfered structure is arranged on the edge of the bottom surface on one side of the valve core, the valve core forms a seal with a conical surface of an inner wall of the chamber through the conical chamfered structure, the bottom surface on the other side of the valve core is connected to one end of a compression spring, the other end of the compression spring is connected to a pressure regulating mechanism, and the pressure regulating mechanism is installed in the chamber.
[0006] Preferably, the pressure regulating mechanism includes a valve sleeve, a spring seat, an adjusting bolt, and a locking nut. A threaded hole penetrating the valve body is provided at one end of the chamber, a threaded structure is provided at the front section of the outer wall of the valve sleeve, the front section of the valve sleeve is threadedly connected to the threaded hole of the valve body, a groove is provided on the bottom surface of one side of the valve sleeve, a threaded hole is provided on the bottom surface of the groove, the adjusting bolt is threadedly connected to the threaded hole on the bottom surface of the groove, the spring seat is a cylinder, the bottom surface of one side of the spring seat is connected to the spring, the other end of the spring seat is connected to the bottom surface of the groove, and the locking nut is threadedly connected to the outside of the adjusting bolt.
[0007] Preferably, a connecting column is provided at the center of the spring seat surface, and the connecting column is sleeved with the spring.
[0008] Preferably, an outer side wall of the valve sleeve is provided with a shaft shoulder, the shaft shoulder is connected to the outer surface of the valve body, and the shaft shoulder is used to limit the valve sleeve.
[0009] Preferably, a gasket is provided between the compression spring and the spring seat, and the gasket is sleeved on the connecting column.
[0010] Preferably, a sealing ring is provided between the outer side wall of the spring seat and the inner side wall of the valve sleeve groove.
[0011] Preferably, a sealing ring is provided between the valve sleeve and the inner wall of the chamber.
[0012] Beneficial effect: Compared with the prior art, the utility model adopts a high-hardness gasket in front of the spring seat to prevent the spring seat from being deformed due to the huge pre-tightening force of the adjustment spring, which leads to a weakening of the sealing effect. The high-hardness gasket is used to increase the service life, and it is more stable and reliable during operation, and is not prone to jamming, oil leakage and other faults.
[0013] This structure adopts a sealing pair with a conical surface. While forming a surface seal, the conical surface can also provide support for the valve core to prevent the valve core from shifting. In the utility model, the supporting force applied by the conical sealing surface to the valve core and the pressure applied by the compression spring to the valve core are opposite, so that the conical chamfered structure of the valve core is in close contact with the conical surface of the valve body to ensure the sealing. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the internal structure of a direct-acting relief valve used on a multi-way valve;
[0015] In the figure, 1, valve body, 2, oil inlet, 3, oil outlet, 4, chamber, 5, valve core, 6, compression spring, 7, spring seat, 8, valve sleeve, 9, adjusting bolt, 10, locking nut. DETAILED DESCRIPTION
[0016] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.
[0017] like Figure 1 As shown, valve body 1, oil inlet 2, oil outlet 3, chamber 4, valve core 5, compression spring 6, spring seat 7, valve sleeve 8, adjusting bolt 9, locking nut 10;
[0018] A direct-acting relief valve for a multi-way valve comprises a valve body 1 and a valve core 5. A chamber 4 is provided in the valve body 1. The chamber 4 is connected to an oil outlet 3 and an oil inlet 2 on the valve body 1. The valve core 5 is used to separate the oil inlet 2 and the oil outlet 3. The valve core 5 is movably arranged in the chamber 4. The valve core 5 is located between the oil inlet 2 and the oil outlet 3. A conical chamfered structure is provided on the edge of the bottom surface on one side of the valve core 5. The valve core 5 forms a seal with a conical surface of an inner wall of the chamber 4 through the conical chamfered structure. The bottom surface on the other side of the valve core 5 is connected to one end of a compression spring 6. The other end of the compression spring 6 is connected to a pressure regulating mechanism. The pressure regulating mechanism is installed in the chamber 4.
[0019] The pressure regulating mechanism includes a valve sleeve 8, a spring seat 7, an adjusting bolt 9, and a locking nut 10. A threaded hole penetrating the valve body 1 is provided at one end of the chamber 4. A threaded structure is provided at the front section of the outer wall of the valve sleeve 8. The front section of the valve sleeve 8 is threadedly connected in the threaded hole of the valve body 1. A groove is provided on the bottom surface of one side of the valve sleeve 8. A threaded hole is provided on the bottom surface of the groove. The adjusting bolt 9 is threadedly connected in the threaded hole on the bottom surface of the groove. A shaft shoulder is provided on the outer wall of the valve sleeve 8. The shaft shoulder is connected to the outer surface of the valve body 1. The shaft shoulder is used to limit the valve sleeve 8.
[0020] The spring seat 7 is a column, and a connecting column is provided at the center of the surface of the spring seat 7. The connecting column is sleeved with the spring. The bottom surface of one side of the spring seat 7 is connected to the spring, and the other end of the spring seat 7 is connected to the bottom surface of the groove. A gasket is provided between the compression spring 6 and the spring seat 7, and the gasket is sleeved on the connecting column. The locking nut 10 is threadedly connected to the outside of the adjusting bolt 9.
[0021] Instructions for use: The valve core 5 cooperates with the valve body 1 to form a seal at its conical surface; the adjusting spring is installed between the valve core 5, the spring seat 7 and the gasket to maintain a certain spring preload; an adjusting mechanism is provided above the valve sleeve 8, which is composed of an adjusting screw, a locking nut 10 and a spring seat 7. When adjusting the opening and closing pressure, the space of the adjusting spring is compressed through this adjusting mechanism, and the preload force of the adjusting spring is increased to control the opening pressure of the relief valve. The locking nut 10 locks the adjusting screw to achieve the relief pressure required during operation.
[0022] During operation, hydraulic oil enters from the oil inlet 2. When the pressure is greater than the preset spring preload, the valve core 5 moves until the oil circuit is opened, so that the oil outlet 3 is connected to the oil inlet 2, thereby achieving a pressure reduction effect.
[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A direct-acting relief valve for a multi-way valve, characterized in that: It includes a valve body and a valve core. The valve body is provided with a chamber, the chamber is connected to the oil outlet and the oil inlet on the valve body, the valve core is used to separate the oil inlet and the oil outlet, the valve core is movably arranged in the chamber, the valve core is located between the oil inlet and the oil outlet, a conical chamfered structure is provided on the edge of the bottom surface of one side of the valve core, the valve core forms a seal with the conical surface of the inner wall of the chamber through the conical chamfered structure, the bottom surface of the other side of the valve core is connected to one end of a compression spring, the other end of the compression spring is connected to a pressure regulating mechanism, and the pressure regulating mechanism is installed in the chamber.
2. A direct-acting relief valve for a multi-way valve according to claim 1, characterized in that: The pressure regulating mechanism includes a valve sleeve, a spring seat, an adjusting bolt and a locking nut. A threaded hole penetrating the valve body is provided at one end of the chamber, a threaded structure is provided at the front section of the outer wall of the valve sleeve, the front section of the valve sleeve is threadedly connected to the threaded hole of the valve body, a groove is provided on the bottom surface of one side of the valve sleeve, a threaded hole is provided on the bottom surface of the groove, the adjusting bolt is threadedly connected to the threaded hole on the bottom surface of the groove, the spring seat is a column, the bottom surface of one side of the spring seat is connected to the spring, the other end of the spring seat is connected to the bottom surface of the groove, and the locking nut is threadedly connected to the outside of the adjusting bolt.
3. A direct-acting relief valve for a multi-way valve according to claim 2, characterized in that: A connecting column is arranged at the center of the surface of the spring seat, and the connecting column is sleeved with the spring.
4. A direct-acting relief valve for a multi-way valve according to claim 2, characterized in that: An axial shoulder is arranged on the outer side wall of the valve sleeve, the axial shoulder is connected to the outer surface of the valve body, and the axial shoulder is used for limiting the position of the valve sleeve.
5. A direct-acting relief valve for a multi-way valve according to claim 2, characterized in that: A gasket is arranged between the compression spring and the spring seat, and the gasket is sleeved on the connecting column.
6. A direct-acting relief valve for a multi-way valve according to claim 2, characterized in that: A sealing ring is arranged between the outer side wall of the spring seat and the inner side wall of the valve sleeve groove.
7. A direct-acting relief valve for a multi-way valve according to claim 1, characterized in that: A sealing ring is arranged between the valve sleeve and the inner wall of the chamber.