Liquid return circuit breaker valve

Abstract

The invention relates to a liquid return circuit breaker valve which comprises a shell, a valve core, a joint, a bias device, a fixed plate, a waterproof bag and a ventilation device, wherein the fixed plate is fixedly arranged in a through cavity at the tail part of the valve core, and a liquid through hole is molded along the circumferential direction of the fixed plate; the bias device is arranged in the sealed waterproof bag, one end of the bias device leans against the tail part of the valve core, and the other end of the bias device is fixedly arranged on the fixed plate; one end of theventilation device is inserted into the waterproof bag by the fixed plate, and the other end of the ventilation device extends outside the shell and communicated with the atmosphere; the ventilation device is also provided with a branch channel communicated with the tail end of the through cavity; the branch channel is internally provided with a first one-way valve which only allows the atmosphere to flow from the waterproof bag towards the tail end of the through cavity; and a main branch channel of the ventilation device communicated with the atmosphere is internally provided with a second one-way valve which only allows the atmosphere to flow towards the interior of the ventilation device. The liquid return circuit breaker valve is simple in structure, high in flow rate and long in service life.

Description

technical field [0001] The invention relates to a liquid return cut-off valve, in particular to a liquid return cut-off valve used for a hydraulic support in the coal mining industry. Background technique [0002] The return liquid breaker valve is widely used in the liquid return pipeline of the coal mine hydraulic support, which can make the return liquid line have a certain back pressure, thereby enhancing the operation stability of the whole system, and can prevent other intact supports from being damaged when repairing the support. Liquid back causes malfunction of the maintenance bracket. A liquid return cut-off valve that the applicant has applied for includes a housing, a valve core set in the housing, and a joint, which is set at the tail of the valve core. The spring of the through hole; the fixed plate is fixed in the through cavity at the tail of the valve core, and the fixed plate is formed with a liquid hole in the circumferential direction; the biasing device...

AI Technical Summary

Problems solved by technology

[0003] For this reason, the technical problem to be solved by the present invention is that after the waterproof bag of the liquid return cut-off valve in the prior art is damaged, the medium in the valve will overflow the valve through the ventilation device, causing leakage. After that, there will be no leakage, and the liquid return shut-off valve can still work normally

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