A hydraulically controlled one-way valve

Abstract

Disclosed is a hydraulic control one-way valve. The valve body is provided with a main spool on one side of a main fluid channel, and a spring is arranged in the opening of the main spool base, and the end of the spring protruding from the main spool is in contact with an end cover II and a control piston is provided on the other side of the main fluid channel. The control piston is provided with a piston rod which is integrally connected there with, the piston rod penetrates through a center through hole of an annular baffle, and the end can be in contact with the main spool, and the other end of the main fluid channel is provided with an end cover I. An inlet port A, an outlet port B, a control port X and a drain port Y are provided on one surface of the valve body, and the inlet port A and a valve chamber of the main fluid channel on one side of the truncated cone of the main spool are communicated. The control port X is communicated with a backpressure chamber of the control piston through an internal passage, and the drain port Y is connected with the ring chamber of the main spool and the drainage chamber of the control piston respectively. The control power can be saved, the impact vibration can be reduced effectively and the service life can be prolonged.

Description

technical field [0001] The invention relates to a hydraulic component, in particular to a hydraulic control check valve. Background technique [0002] Compared with ordinary check valves, there are control oil circuits and control oil ports in the hydraulic control check valves, which can realize the function of oil reverse flow through adjusting the pressure of the control oil circuits. When the control oil circuit of the hydraulic control check valve is not connected to high-pressure oil, the working state of the hydraulic control check valve is the same as that of the ordinary check valve, and the pressure oil can only flow from the oil inlet to the oil outlet, and cannot flow in the opposite direction. ; When the control oil circuit of the hydraulic control check valve is connected to high-pressure oil, the control piston pushes the main valve core to move under the action of high-pressure oil, so that the oil inlet and outlet are connected. [0003] According to differ...

AI Technical Summary

Problems solved by technology

For the internal leakage type hydraulic control check valve, when the pressure of the reverse oil outlet is greater than the pressure of the control port, the hydraulic control check valve cannot realize reverse opening. Therefore, the internal leakage type hydraulic control check valve is generally only suitable for the reverse direction. There is no back pressure at the oil outlet or the back pressure is small; for the external leakage hydraulic control check valve, although the control piston does not need to overcome the pressure of the reverse oil outlet when the oil flows in the reverse direction, the reverse oil inlet and The spring chamber between the valve body and the main spool is connected, so it still needs to overcome the pressure of the reverse oil inlet, and under the push of the control piston, the main spool of the hydraulic control check valve is opened, closed and under the conditions of sudden pressure changes. The hydraulic power of the hydraulic control check valve is relatively large, which will produce strong shock and vibration, which will easily cause damage to the internal parts of the hydraulic control check valve; for the pressure relief hydraulic control check valve, although the unloading spool avoids the opening, closing and The shock and vibration problems caused by the large hydraulic force under the sudden pressure change condition make the structure of the hydraulic control check valve more complicated, and it is still necessary to overcome the pressure of the reverse oil inlet, and the pressure relief hydraulic control check valve It is only applicable when the reverse oil inlet is connected to a closed cavity, and when the reverse oil inlet is connected to a continuous oil supply source, the control pressure must be greatly increased and the main spool must be opened to a certain opening Only then can the oil reverse through the hydraulic control check valve

Images