CONTROL VALVE Russian patent published in 2006 - IPC F16K3/22 F16K47/04 

FIELD: valving.

SUBSTANCE: control valve comprises housing that is provided with inlet and outlet passages and receives two gates interconnected by means of a rod that is set in motion by means of the drive. The first gate is made of the step rod with piston provided with openings and sealing surface. The pin is secured to the step of greater diameter downstream of the piston. The ends of the pin project out of the grater diameter of the rod. The step of lesser diameter is provided with the additional piston. The under-piston space of this piston is in communication with the atmosphere. The above-piston space of the piston is connected with the inlet passage through the opening. The second gate is made of bushing-plunger that embraces the piston and is provided with the radial openings and radial grooves. The radial openings are arranged symmetrically above the sealing surface. The radial grooves are made in the bottom face from the side of the top face to the radial openings. The bushing plunger and unmovable seat are axially aligned. The seat is provided with the sealing surface and sealing member. The sealing member is made of a tube provided with radial ports. The ports and the openings in the bushing-plunger are axially aligned. The sealing surface of the bushing-plunger cooperates with the sealing surface of the seat.

EFFECT: enhanced reliability and simplified structure.

3 dwg