Bi-directional flow-limiting valve

Abstract

The invention provides a bi-directional flow-limiting valve. The bi-directional flow-limiting valve comprises a valve body and a valve core. A body cavity of the valve body is arranged to be two fluid cavities communicated with each other. An inner end opening of one of fluid cavities is plugged by one end of the valve core. First springs are connected between the other end of the valve core and the inner wall of the valve body and used for providing the valve core with force for plugging the fluid cavities. A through hole is formed in the valve core along a radial direction of the valve core. A drain plug is plugged in a hole opening of the through hole, which is plugged by the valve core, of the end wall of one fluid cavity. A second spring is connected between the drain plug and the valve core and used for providing the drain plug with force for plugging the hole opening of the through hole. By cooperation between the valve body and the valve core and cooperation between the through hole and the drain plug, unidirectional circulation of fluids is achieved without backflow. Due to the fact that the cavity diameter of each fluid cavity is larger than hole diameter of the through hole, different fluid cavities are selected as fluid inlets such that different flow rate and flow quantity of fluids can be realized. Sealing rings help to ensure sealing performance of the bi-directional flow-limiting valve such that the back flow-resistant effect is better achieved.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a flow limiting valve. Background technique [0002] Most of the restrictor valves are one-way restrictor valves, which only allow fluid to pass in one direction, and play the role of one-way conduction and reverse flow resistance, but in some fields, after using one-way restrictor valves to restrict flow , requires the fluid to return slowly. For example, in the field of hydraulic machinery, one-way flow limiting valves are often used to realize the one-way passage of hydraulic oil and reverse flow resistance, while the return flow of hydraulic oil needs to be additionally controlled through other oil passages to achieve hydraulic pressure. Reciprocating motion in the form of mechanical rapid ejection and gentle retraction, but this will inevitably increase the control cost, and the pipeline laying is complicated and has great limitations. Contents of the invention [0003] The problem ...

AI Technical Summary

Problems solved by technology

[0002] Most of the restrictor valves are one-way restrictor valves, which only allow fluid to pass in one direction, and play the role of one-way conduction and reverse flow resistance, but in some fields, after using one-way restrictor valves to restrict flow , requires the fluid to return slowly. For example, in the field of hydraulic machinery, one-way flow limiting valves are commonly used to realize the one-way passage of hydraulic oil and reverse flow resistance, while the return flow of hydraulic oil needs to be controlled separately through other oil passages, so as to realize hydraulic pressure. Reciprocating motion in the form of mechanical rapid ejection and gentle retraction, but this will inevitably increase the control cost, and the pipeline laying is complicated and has great limitations

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