SHUT OFF VALVE Russian patent published in 1996 - IPC

FIELD: valving. SUBSTANCE: valve has housing with the inlet passageway coupled with the inlet space and outlet passageway coupled with the outlet space, seat, and normally open valve mounted inside the inlet space, drive for moving the valve having a piston with a double-sided rod that are mounted in a bore made in the housing behind the seat to define a space between the seat and piston, and control space between the piston and baffle that separates the control space from the outlet space. One end of the rod passes through the opening made in the seat and rigidly connected with the valve. The second end of the rod passes through the baffle and enters the outlet space. The rod is provided with the axial and radial passageways that connect the space between the seat and piston with the outlet space. The control space is in communication with the control space connected with a control system that is coupled with the power passageway. The baffle that separates the control space from the outlet space is made up as a floating ring valve the outer diameter of which is greater than the diameter of the piston. The valve is provided with a stop from the side of the control space. The stop is mounted to permit interaction with the piston of the valve drive. EFFECT: enhanced reliability. 2 cl, 1 dwg