STOP CONTROL VALVE Russian patent published in 2006 - IPC F16K3/24 F16K47/04 

FIELD: valving.

SUBSTANCE: stop control valve has housing provided with inlet and outlet passages and two gate valves connected with the rod actuated by means of a drive. The first valve gate is a stop valve and is made of rod with the step piston provided with openings and sealing surface. The second gate valve is a stop control one and is made of step bushing-plunger that is provided with the sealing surface and females the piston. The bushing plunger is mounted for permitting axial movement and locking it at the end positions. The stop-control gate valve is axially aligned in the seat provided with the sealing surface and sealing member. The seat is piping and provided with openings that are arranged downstream of the sealing member and sealing surface. The inner diameter of the piping part of the seat downstream of the sealing surface is mating with the diameter of the stop-control gate valve which is mounted for permitting axial movement by means of the step piston along the piping section of the seat from the sealing surface. At the end position the sealing surface of the step piston of the rod cooperates with the sealing member. The sealing surface of the step bushing-plunger cooperates with the sealing surface of the seat.

EFFECT: enhanced reliability.

1 dwg