GATE Russian patent published in 2003 - IPC

FIELD: manufacture of valves; designed for shutoff of pipeline flow section with help of manual or hydropneumatic drive. SUBSTANCE: gate has body, cover, drive, slide valve, rod with sealing unit and additional sealing. Gate is installed in body with seats. Sealing unit is installed between rod and cover. Additional sealing is located in front of sealing unit with formation of annular space between them. Cover has normally open and normally closed valves. Outlet of normally open valve and inlet of normally closed valve are connected with annular space. Inlet of normally open valve is connected with gate cavity. Outlet of normally closed valve is connected with atmosphere. Normally open valve has self-acting shutoff member with seat and adjusting screw. Shutoff member is installed on side of annular space and is spring-loaded relative to cover. Adjusting screw is coaxial to shutoff member. Stroke of adjusting screw is larger than that of shutoff member. EFFECT: extended functional potentialities of gate, increased its performance and reliability. 2 dwg