CONTROL VALVING MEMBER Russian patent published in 2007 - IPC F16K3/02 

FIELD: valving systems.

SUBSTANCE: control valving member comprises housing provided with the space, inlet and outlet passages, movable rod connected with the actuator, control flat gate valve provided with the opening and cooperating with the seat mounted inside the housing from the side of the outlet passage. The device is additionally provided with the seat made of the axially movable step bushing having the sealing surface and mounted in the inlet passage. The rod is step-like, and the two-way valving distributor is made of the step bushing that embraces the rod. The step bushing has different effective areas of the cross-section at the faces and sealing surfaces. The sealing surfaces are arranged on the faces of the steps of larger and smaller diameters. The steps cooperate with the appropriate seats. The passage that connects the valving distributor with the housing space receives the check valve.

EFFECT: enhanced reliability, improved maintainability, and prolonged service life.

1 dwg