Valve device

Abstract

The invention discloses a valve device. The ball valve comprises a valve body, a ball and a first spring. A valve cavity is formed in the valve body. Two ends of the valve cavity respectively penetrate to two ends of the valve body to form a liquid inlet and a liquid outlet; a liquid inlet port is formed at the joint of the liquid inlet and the valve cavity; a liquid outlet port is formed at the joint of the liquid outlet and the valve cavity; the ball body and the first spring are arranged in the valve cavity; the first spring is used for pushing against the ball body to plug the liquid inletport, the valve cavity is located on one side of the liquid inlet port to form a conical guide contraction cavity, which is used for limiting radial movement of the ball body sliding into the guide contraction cavity.

Description

technical field [0001] The present invention relates to a valve device for limiting fluid backflow. Background technique [0002] A valve used to limit (or prevent) fluid reverse flow is usually called a one-way valve or a check valve, and the valve is widely used in fluid control systems. For example, the valve is involved in the control of replenishing fluid to an accumulator for accumulating fluid such as hydraulic oil. The specific method is: the fluid power source (such as a hydraulic pump) provides pressure fluid to the accumulator through the liquid supply pipeline, and the above-mentioned valve is arranged on the liquid supply pipeline, so that when the fluid power source delivers a certain pressure fluid to the accumulator, The valve opens to allow pressurized fluid to pass through the valve into the accumulator, and closes to prevent fluid in the accumulator from flowing back through the valve when the fluid power source ceases to provide pressurized fluid. [00...

AI Technical Summary

Problems solved by technology

[0005] 1. The radial size of the valve cavity is set relatively large relative to the diameter of the sphere, so that after the sphere is away from the liquid inlet, the pressure fluid can pass through the gap defined between the sphere and the wall of the valve cavity, so as to pass through the valve device , however, setting the radial size of the valve cavity relatively large relative to the diameter of the ball will cause such a problem: when the fluid power source stops supplying pressurized fluid to the accumulator, the fluid in the accumulator and the spring will move towards the liquid inlet The port direction of the port pushes against the sphere so that the sphere finally blocks the liquid inlet. However, in the process of pushing against the sphere, because the size of the valve cavity is larger than the sphere, the sphere does not necessarily move strictly in the axial direction during this movement process. In fact, the sphere has radial movement separation at all times. This movement of the sphere causes: on the one hand, the closer the sphere is to the port of the oil inlet, the greater its movement speed. In this movement stage, the distance between the sphere and the valve cavity The wall of the cavity will generate a collision with a large momentum; on the other hand, because the direction of motion of the ball may not be aligned with the port of the liquid inlet, the ball will not immediately contact the entire area of ​​the port, but will first contact the peripheral part of the end area contact, and then progressively contact the full area of ​​the port

Therefore, the above-mentioned valve device causes the accumulator pressure release process to be more complicated

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