CN219510209U - Relief pressure valve with overflow function - Google Patents

Abstract

The utility model discloses a pressure reducing valve with an overflow function, which comprises a valve body, wherein a valve core is arranged in the valve body, a spring seat is arranged at the rear end of the valve core, a spring is arranged on the spring seat, a valve seat is arranged at the rear end of the valve body, a pressure regulating gasket is arranged on the valve seat, a first check ring and a second check ring are arranged on the valve body, an oil outlet A, an oil inlet P and an oil return port T are arranged on the valve body, and a sealing belt L2 is arranged between the oil outlet A and the oil return port T. The utility model has simple structure, the front end of the valve core is limited by the valve body, the rear end is limited by the valve seat, and a proper sealing belt L2 is designed between the port A and the port T, so that when the port A generates instant high pressure, the high pressure can be ensured to be quickly discharged, and the pilot valve or the motor can be protected.

Description

Relief pressure valve with overflow function

Technical Field

The utility model relates to the technical field of pressure reducing valves, in particular to a pressure reducing valve with an overflow function.

Background

The pressure reducing valve is widely applied to hydraulic systems of engineering machinery such as an excavator, a crane, a loader and the like, and is used for reducing pressure of high-pressure oil to a proper pressure to supply a pilot valve or a motor. The common pressure reducing valve in China mainly comprises a valve body 1, a valve core 2, a spring 3, a valve seat 4, a pressure regulating gasket 5, an O-shaped sealing ring and the like, wherein the working principle of the common pressure reducing valve is as shown in fig. 4, a port P is communicated with a port A, the port P is connected with high-pressure oil of a system, the port A is connected with an oil inlet of a pilot valve or a motor and is communicated with a port T through a slender damping hole with the diameter d, the valve core 2 moves rightwards against the spring force along with the rising of the pressure of the port A, the opening L3 of the valve core 2 and the valve body 1 is gradually reduced until the opening L3 approaches to 0, the high-pressure oil leaks to the port T in a small amount through the damping hole, and the pressure is the pressure reducing pressure when the pressure reaches an equilibrium point. In actual operation, the pressure required by the pilot valve or the motor is continuously changed, the pilot valve or the motor can sometimes generate instant high pressure under the influence of external factors, the valve core of the structure of fig. 2 can not realize overflow nor limit, and the severe impact caused by the great frequent reciprocating motion of the valve core 2 in the valve body 1 can lead the spring to generate permanent deformation or even fracture, and simultaneously has great influence on the service life of the pilot valve or the motor.

Disclosure of Invention

The utility model aims to solve the technical problems and provides a pressure reducing valve with an overflow function.

In order to achieve the technical purpose and meet the technical requirements, the utility model adopts the technical scheme that: the utility model provides a relief pressure valve with overflow function, includes valve body, its characterized in that: the valve is characterized in that a valve core is arranged in the valve body, a spring seat is arranged at the rear end of the valve core, a spring is arranged on the spring seat, a valve seat is arranged at the rear end of the valve body, a pressure regulating gasket is arranged on the valve seat, a first check ring and a second check ring are arranged on the valve body, an A oil outlet, a P oil inlet and a T oil return opening are arranged on the valve body, and a sealing belt L2 is arranged between the A oil outlet and the T oil return opening.

Preferably: the length of the sealing belt L2 is larger than the maximum opening L1.5-2 mm between the P oil inlet and the A oil outlet, and the length of the sealing belt L2 is smaller than the authority displacement S1.5-1 mm of the valve core 2.

Preferably: the length of the sealing strip L2 is not less than 1.5mm.

Compared with the traditional structure, the utility model has the beneficial effects that: the valve core is characterized in that the valve core is simple in structure, the front end of the valve core is limited by the valve body, the rear end of the valve core is limited by the valve seat, and a proper sealing band L2 is designed between the port A and the port T, so that when the port A generates instant high pressure, the high pressure of the valve core can be ensured to be quickly discharged, the valve core plays a role in protecting a pilot valve or a motor, and the service life of the pilot valve or the motor is prolonged. Meanwhile, due to the limiting effect of the valve seat, the spring can be prevented from being compressed more, and the spring is prevented from being deformed permanently or even broken.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of a domestic common pressure reducing valve;

FIG. 3 is a schematic diagram of the present utility model for pressure relief;

FIG. 4 is a hydraulic schematic diagram of a domestic common pressure reducing valve;

in the figure: 1. the valve comprises a retainer ring, a valve core, a retainer ring, a spring seat, a spring, a valve body, a valve seat, a pressure regulating gasket, an O-shaped ring A, an O-shaped ring B, an O-shaped ring C and an O-shaped ring D.

Detailed Description

The present utility model will be further described below.

Referring to the drawings, a relief valve with overflow function, comprising a valve body 6, characterized in that: the valve is characterized in that a valve core 2 is arranged in the valve body, a spring seat 4 is arranged at the rear end of the valve core 2, a spring 5 is arranged on the spring seat 4, a valve seat 7 is arranged at the rear end of the valve body 6, a pressure regulating gasket 8 is arranged on the valve seat 7, a first retainer ring 1 and a second retainer ring 3 are arranged on the valve body 6, an oil outlet A, an oil inlet P and an oil return port T are arranged on the valve body 6, and a sealing belt L2 is arranged between the oil outlet A and the oil return port T.

In the preferred embodiment, the length of the sealing belt L2 is larger than the maximum opening L1.5-2 mm between the P oil inlet and the A oil outlet, and the length of the sealing belt L2 is smaller than the authority displacement S1.5-1 mm of the valve core 2.

In the preferred embodiment, the length of the sealing strip L2 is not less than 1.5mm.

In specific implementation, the front end of the valve core 2 is limited by the valve body 6, the rear end is limited by the valve seat 7, and in a natural state, the maximum opening degree L1 of the P port and the A port, the maximum sealing length L2 of the A port and the T port and the maximum displacement length S1 of the valve core 2 are in a relation that S1 is more than L2 and more than L1 by 1.5-2mm, and S1 is more than L2 by 0.5-1mm. When the pressure reducing valve works normally, the P port is used for feeding oil, the A port is connected with an executing element such as a pilot valve or a motor, the valve core 2 moves rightwards against the spring force along with the rising of the pressure of the A port, the L1 is reduced until the pressure is close to 0, the sealing belt L2 always keeps not less than 1.5mm, a small amount of hydraulic oil leaks to the T port through a gap of the sealing belt L2, when the pressure of the A port reaches an equilibrium state, stable pressure reducing pressure is formed, and the pressure reducing pressure can be realized by increasing and decreasing the pressure regulating gasket 8. In actual operation, the actuating element such as the pilot valve or the motor is possibly influenced by external environmental factors to enable the port A to generate instant high pressure, when the port A generates instant high pressure, the valve core 2 moves rightwards to the limit position, because S1 is larger than L2, the port A is communicated with the port T and is cut off from the port P, high pressure oil can overflow and the port A can be rapidly discharged, according to the relation, the opening amounts of the port A and the port T are not smaller than 0.5 millimeter, the rapid discharge of the high pressure can be ensured, the pilot valve or the motor is protected, and meanwhile, the whole hydraulic system cannot be influenced. Meanwhile, due to the limiting effect of the valve seat 7, the spring can be prevented from being compressed more, and permanent deformation and even fracture of the spring can be prevented. The valve is used in hydraulic systems of engineering machinery such as excavators, cranes and loaders, high-pressure oil in the system is depressurized and then is used by a pilot valve or a motor, and a pilot pump special for supplying oil to the pilot valve or the motor can be omitted.

The foregoing embodiments of the present utility model are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model, and all equivalent technical solutions are also included in the scope of the present utility model, which is defined by the claims.

Claims (3)

1. Pressure reducing valve with overflow function, including valve body (6), its characterized in that: be provided with case (2) in the valve body, case (2) rear end is provided with spring holder (4), be provided with spring (5) on spring holder (4), valve body (6) rear end is provided with disk seat (7), be provided with pressure regulating gasket (8) on disk seat (7), be provided with first retaining ring (1), second retaining ring (3) on valve body (6), be provided with A oil-out, P oil inlet, T oil return opening on valve body (6), be provided with sealing band L2 between A oil-out and the T oil return opening.

2. The relief valve with overflow function of claim 1, wherein: the length of the sealing belt L2 is larger than the maximum opening L1.5-2 mm between the P oil inlet and the A oil outlet, and the length of the sealing belt L2 is smaller than the authority displacement S1.5-1 mm of the valve core (2).

3. A relief valve with overflow function according to claim 1 or 2, characterized in that: the length of the sealing strip L2 is not less than 1.5mm.