STOP CONTROL VALVE Russian patent published in 2005 - IPC

FIELD: valving.

SUBSTANCE: stop control valve comprises housing with inlet and outlet passages. The housing receives two valve gates which are connected with the rod. The rod is set in motion by a drive. The first valve gate is a relief one and is made of a step rode with the rest and sealing surface at its end. The step rod is set in the through step opening provided in the housing and defines a hydraulic space with the housing. The inlet passage receives the end of the rod provided with the step of greater diameter. The step rod is mounted for permitting axial movement and its locking at the end positions. The end of the step rod with the rest and sealing surface is mounted coaxially inside the second control valve. At one end position, the end of the rod cooperates with the sealing member of the control valve and overlaps its relief port. The control valve is provided with the sealing surface and mounted in the seat with the sealing member. The seat is piping and is provided with openings arranged upstream of the sealing member. The inner diameter of the piping section of the seat upstream of the sealing member is mating with the outer diameter of the control valve. The valve is mounted for permitting axial movement by the rest of the step rod along the piping section of the seat of the sealing member. The central section of the housing is provided with radial opening which receives the piston with the rod. The under-piston space of the radial opening is filled with a fluid (oil) and is connected with the hydraulic space through the passage. The rod is mounted for permitting the co-operation with the piston rod. The housing is provided with openings. The passage is connected with the outlet passage through the openings when the control valve is open.

EFFECT: simplified structure and enhanced reliability.

2 dwg