CONTROL DEVICE Russian patent published in 2007 - IPC F16K3/02 

FIELD: gas producing industry; pipeline valves and fittings.

SUBSTANCE: invention relates to shutoff devices with shutoff member and it is designed for mounting in gas wells of gas fields to control flow of transported medium. Housing of proposed control device has inlet and outlet channels and trough hole in seat. It has flat gate with hole installed in housing and connected with rod of drive, insert and stepped bushing arranged coaxially to through hole after seat. Said stepped bushing is installed fro axial displacement and locking in extreme positions. Holes in housing are mated with surfaces of stepped bushing, thus forming a space. Said space communicates with atmosphere. Stepped bushing in one of extreme positions is pressed to housing by spring. Additional protective bushing is arranged coaxially relative to stepped bushing for rotary displacement in stepped bushing under action of transported medium flow.

EFFECT: increased reliability and service life of control device.

1 dwg