CUT-OFF VALVE Russian patent published in 2001 - IPC

FIELD: plumbing fixtures of oil and gas industry. SUBSTANCE: valve contains housing with space of gasket, outlet and inlet openings, rod with cut-off valve and relief valve, and seat of cut-off valve. The relief valve is provided with bottom opening for connection with the inlet opening of the housing. The relief valve is provided with one side opening which is brought into coincidence with outlet opening of the housing when lifting the rod to prevent direct pressure of fluid or gas. EFFECT: enhanced reliability and longevity of the valve, simplified structure. 1 dwg