Large-flow liquid inlet and return device

The utility model belongs to the technical field of hydraulic control devices, and particularly discloses a large-flow liquid inlet and return device which comprises a valve seat and a valve body assembly installed in the valve seat, a liquid inlet, a liquid return opening, a liquid outlet and a valve body assembly installation hole are formed in the valve seat, and the valve body assembly comprises a reducer union, a plug, a valve sleeve, a piston and a valve element assembly. The structures of the piston and the valve core are improved, the structures of the piston and the valve core are simple, easy to process and not easy to damage, in addition, the action of the piston and the valve core can be hydraulically controlled, and safe underground operation can be realized. 本实用新型属于液压控制装置技术领域，具体公开一种大流量进回液装置，包括阀座和安装于所述阀座内的阀体组件，所述阀座上开始有进液口、回液口、出液口和阀体组件安装孔，所述阀体组件包括变径接头、螺堵、阀套、活塞、阀芯组件。本实用新型对活塞和阀芯的结构进行改进，活塞和阀芯的结构简单，很容易加工，而且不易损坏，另外，可以采用液压控制活塞和阀芯的动作，可以安全的在井下作业。