Pilot operated check valve with big pilot ratio

Abstract

The invention discloses a pilot operated check valve with a big pilot ratio, and relates to the field of hydraulic parts. The pilot operated check valve with the big pilot ratio comprises a valve body; a runner is arranged in the valve body; an oil inlet and an oil outlet are separately formed in positions, at the two ends of the runner, in the valve body; a valve rod used for controlling the runner to be conducted in one way is arranged in the valve body elastically in a sliding manner; a pressure relief way is formed in the valve rod; the two ends of the pressure relief way communicate withthe oil inlet and the oil outlet; a valve core used for controlling the open-close of the pressure relief way is arranged in the pressure relief way elastically; an ejector rod used for ejecting the valve core is connected into the valve rod in a sliding manner; a valve plug connected with the ejector rod is arranged in the valve rod in the length direction of the ejector rod in a sliding manner;the cross section of the valve plug is larger than that of the ejector rod; and a control oil path used for hydraulically controlling the valve plug to slide is arranged in the valve body. The invention solves the problems of high energy consumption of the high-pressure control oil path and high hydraulic impact when the check valve is conducted reversely in the prior art, and by reducing the pressure required by the control oil path, the energy consumption required by the control oil path is reduced, and the hydraulic impact generated when the check valve is conducted is reduced.

Description

technical field [0001] The invention relates to the field of hydraulic parts, more specifically, it relates to a large pilot ratio hydraulic control check valve. Background technique [0002] The hydraulic control check valve is a hydraulic component used to restrict the one-way flow of fluid in the oil circuit. Check valves, also known as check valves or check valves, are used in hydraulic systems to prevent reverse flow of oil flow. [0003] The existing hydraulic control check valve structure includes a valve body, which is provided with an oil outlet and an oil inlet, and a spool elastically arranged in the valve body to control the unidirectional flow of liquid from the oil inlet to the oil outlet. In actual use, a control oil circuit is also designed in the check valve to drive the movement of the valve core, control the opening of the check valve, and realize the reverse flow of fluid. [0004] When the prior art is used, if the reverse flow of the oil circuit at th...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high energy consumption and high impact force caused by high pressure control oil circuit in the prior art, the purpose of the present invention is to provide a large pilot ratio hydraulic control check valve, which can effectively reduce the pressure in the control oil circuit, thereby reducing Energy consumption required for oil circuit control; through two pressure reliefs, the pressure at the outlet can drop slowly, reducing hydraulic shock

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