An adjustable low-pressure relief valve

Abstract

The utility model discloses an adjustable low-pressure relief valve, comprising a valve seat, a valve sleeve, a valve core and a pressure regulating mechanism, wherein the valve sleeve is movably inserted into the valve seat, a mounting hole is provided on the lower end surface of the valve sleeve, an oil hole as a P port is provided on the side wall of the valve sleeve, the orifice of the mounting hole is a T port, the oil hole is communicated with the mounting hole, the valve core is movably inserted into the mounting hole, the width of the middle section of the valve core is narrower than the width of the upper section and the lower section thereof, the regulating mechanism comprises a spring seat and a compression spring, the spring seat is located at the orifice of the mounting hole, one side of the spring seat is connected to the head of the valve core, and the other side of the spring seat is connected to the spring.

Description

Technical Field

[0001] The utility model relates to an adjustable low-pressure overflow valve. Background Art

[0002] An overflow valve is generally installed in the pilot circuit of a hydraulic pump. This is to enable the circuit to control high-power output through a small flow rate to provide a constant pressure. The overflow valve ensures the key safety application of pressure pipes and pressure vessels. In order to ensure the normal operation of the safety valve and extend the service life of the safety valve, the safety valve in operation should be checked regularly for leakage, jamming, spring rust and other abnormal phenomena during use. Pay attention to whether the locking nuts of the adjusting screw sleeve and the adjusting ring set screw are loose. If any problems are found, take appropriate maintenance measures in time.

[0003] At present, most of the overflow valves are sealed with anti-leakage nuts, but the sealing performance is not stable enough, oil leakage often occurs, and the anti-leakage nuts are complex in structure and expensive. Utility Model Content

[0004] The purpose of the utility model is to solve the above deficiencies in the prior art and to provide an adjustable low-pressure relief valve.

[0005] An adjustable low-pressure relief valve comprises a valve seat, a valve sleeve, a valve core and a pressure regulating mechanism. The valve sleeve is movably arranged in the valve seat. A mounting hole is arranged on the lower end surface of the valve sleeve. An oil hole serving as a P port is arranged on the side wall of the valve sleeve. The orifice of the mounting hole is a T port. The oil hole is communicated with the mounting hole. The valve core is movably arranged in the mounting hole. The width of the middle section of the valve core is narrower than that of the upper section and the lower section thereof. The regulating mechanism comprises a spring seat and a compression spring. The spring seat is located at the orifice of the mounting hole, and one side of the spring seat is connected to the head of the valve core, and the other side of the spring seat is connected to the spring.

[0006] Preferably, a sealing ring is provided between the outer wall of the valve sleeve and the inner wall of the valve seat, the inner wall of the valve seat is provided with an annular groove, the sealing ring is clamped in the groove, and the sealing ring is an elastic O-ring.

[0007] Preferably, the head of the valve core is a spherical structure.

[0008] Preferably, a groove is provided on the upper end surface of the spring seat, a blind hole is provided in the bottom surface of the groove, an inverted cone-shaped chamfered structure is provided at the opening of the blind hole, the head of the valve core is connected to the chamfered structure at the opening of the blind hole, and a connecting column is provided at the center of the lower end surface of the spring seat, and the connecting column is used for the compression spring sleeve.

[0009] Beneficial effects: Compared with the prior art, the utility model forms a pressure regulating mechanism through a spring seat and a spring, and adjusts the deformation degree of the compression spring by adjusting the position of the valve sleeve, thereby adjusting the movement threshold of the valve core, thereby realizing the adjustment of the predetermined threshold of the relief valve. The structure uses an O-ring seal instead of the anti-leakage nut, so that the anti-leakage nut can be replaced by a lower-priced locking nut, which can not only improve the sealing performance, but also effectively reduce the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a diagram of the internal structure of an adjustable low-pressure relief valve;

[0011] In the figure, 1, valve seat, 2, valve sleeve, 3, valve core, 4, spring seat, 5, compression spring, 6, locking nut, 7, sealing ring, 8, oil hole. DETAILED DESCRIPTION

[0012] 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.

[0013] like Figure 1 As shown, valve seat 1, valve sleeve 2, valve core 3, spring seat 4, compression spring 5, locking nut 6, sealing ring 7, oil hole 8;

[0014] An adjustable low-pressure relief valve comprises a valve seat 1, a valve sleeve 2, a valve core 3, and a pressure regulating mechanism. The valve sleeve 2 is movably inserted into the valve seat 1 and fixed by a locking nut 6. A mounting hole is provided on the lower end surface of the valve sleeve 2. An oil hole 8 serving as a P port is provided on the side wall of the valve sleeve 2. The orifice of the mounting hole is a T port. The oil hole 8 communicates with the mounting hole. The valve core 3 is movably inserted into the mounting hole. The width of the middle section of the valve core 3 is narrower than that of the upper section and the lower section thereof. The regulating mechanism comprises a spring seat 4 and a compression spring 5. The spring seat 4 is located at the orifice of the mounting hole, and one side of the spring seat 4 is connected to the head of the valve core 3, and the other side of the spring seat 4 is connected to the spring.

[0015] In this embodiment, a sealing ring 7 is provided between the outer wall of the valve sleeve 2 and the inner wall of the valve seat 1. The inner wall of the valve seat 1 is provided with an annular groove, and the sealing ring 7 is clamped in the groove. The sealing ring 7 is an elastic O-ring.

[0016] In this embodiment, the head of the valve core 3 is a spherical structure.

[0017] In this embodiment, a groove is provided on the upper end surface of the spring seat 4, a blind hole is provided in the bottom surface of the groove, an inverted cone-shaped chamfered structure is provided at the opening of the blind hole, the head of the valve core 3 is connected to the chamfered structure at the opening of the blind hole, and a connecting column is provided at the center of the lower end surface of the spring seat 4, and the connecting column is used for sleeve connection of the compression spring 5.

[0018] Instructions for use: The hydraulic oil flows from port P to port T. When the hydraulic oil flows through port T and reaches the head of valve core 3, the oil pressure will push valve core 3 downward, and the hydraulic oil will flow back to the oil tank from port T, thereby discharging part of the flow of the pilot circuit. By adjusting the position of valve sleeve 2 to change the preload force of the spring, the pressure of the pilot circuit can be set to the value required for the actual working condition, realizing the adjustability of the overflow pressure.

[0019] 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. An adjustable low-pressure relief valve, characterized in that: It includes a valve seat, a valve sleeve, a valve core, and a pressure regulating mechanism. The valve sleeve is movably inserted into the valve seat. The lower end surface of the valve sleeve is provided with a mounting hole. The side wall of the valve sleeve is provided with an oil hole as a P port. The orifice of the mounting hole is a T port. The oil hole is communicated with the mounting hole. The valve core is movably inserted into the mounting hole. The width of the middle section of the valve core is narrower than that of the upper section and the lower section. The regulating mechanism includes a spring seat and a compression spring. The spring seat is located at the orifice of the mounting hole, and one side of the spring seat is connected to the head of the valve core, and the other side of the spring seat is connected to the spring.

2. The adjustable low-pressure relief valve according to claim 1, characterized in that: At least one sealing ring is arranged between the outer wall of the valve sleeve and the inner wall of the valve seat. The inner wall of the valve seat is provided with an annular groove. A sealing ring is clamped in the groove. The sealing ring is an elastic O-ring.

3. The adjustable low-pressure relief valve according to claim 1, characterized in that: The head of the valve core is a spherical structure.

4. The adjustable low-pressure relief valve according to claim 3, characterized in that: The upper end surface of the spring seat is provided with a groove, the bottom surface of the groove is provided with a blind hole, the opening of the blind hole is provided with an inverted cone chamfered structure, the head of the valve core is connected to the chamfered structure at the opening of the blind hole, and a connecting column is provided at the center of the lower end surface of the spring seat, and the connecting column is used for the compression spring sleeve.

Images