Safety valve liquid return system and integrated safety valve liquid return valve block

Abstract

The invention discloses an integrated safety valve liquid return valve block which comprises a valve body, two paths of hydraulic control two-way lock valve elements and two cartridge safety valves, wherein liquid inlets P of the two cartridge safety valves are communicated with a liquid outlet A of the path A and a liquid outlet B of the path B through a passage formed in the valve body respectively, and liquid outlets T of the two cartridge safety valves are in fluid communication with a liquid passing cavity Q of a cartridge alternate valve through the passage formed in the valve body; the cartridge alternate valve is matched with the valve body to form cavities A and B; a liquid return opening A is formed in a valve wall between the cavity A and the liquid passing cavity Q, and a liquid return opening B is formed in the valve wall between the cavity B and the liquid passing cavity Q; the cavity A is in fluid communication with the liquid inlet A of the path A, and the cavity B is in fluid communication with the liquid inlet B of the path B. According to the integrated safety valve liquid return valve block, the cartridge safety valve and the cartridge alternate valve are integrated on the basis of the conventional double-hydraulic control or single-hydraulic control two-way lock, the system structure is basically designed and laid out on the premise of recovering return liquid of the safety valves, the arrangement of a pipeline is avoided, system return liquid is recycled, and the integrated safety valve liquid return valve block is easy to mount, high in design integration degree, convenient to troubleshoot and overhaul and reasonable in layout.

Description

technical field [0001] The invention relates to a liquid return system for a safety valve, in particular to a liquid return system for a safety valve used in fully mechanized mining face equipment such as a support jack, and an integral liquid return valve block for the safety valve formed by an integrated design. Background technique [0002] The safety valve is an automatic pressure relief device driven by medium pressure. As a protective component of the hydraulic support, it has the characteristics of high safety margin, fast response, reliable sealing form, and strong anti-pollution ability. It is mostly used in the lower cavity of the column, balance The upper and lower chambers of the jack, the piston chamber or piston rod chamber of the push jack, etc. The performance of the safety valve directly affects the normal operation of the hydraulic support and the safety of personnel. With the application of the large mining height and caving support, the working resistance...

AI Technical Summary

Problems solved by technology

In this way, during the opening process of the safety valve, the discharged liquid will not only affect the sealing and normal operation of electrical products, but also cause pollution to the surface water environment; at the same time, the traditional safety valve liquid return system mainly uses pipelines to connect the main valve liquid return port Connected to the tail end of the safety valve, not only the pipeline layout is complicated, but also the structure is unstable, maintenance is inconvenient, the flow resistance is too large, and the cost is high

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