COMBINATION VALVE Russian patent published in 1994 - IPC

FIELD: manufacture of fittings. SUBSTANCE: drain hole of housing is closed by shut-off member engageable with spring-loaded piston through rod. Piston is mounted in cylinder provided with cover. Drain branch pipes are secured on outer surface of housing over circumference. Swivel plug provided with drive is mounted in housing coaxially to shut-off member; plug embraces rod; it is made in form of sleeve having through- way hole in its wall and bottom inclined towards drain branch pipe connected with through-way hole. Plug is loaded with spring at its end. Secured on cover is plate with holes connected with pressure sensors whose number is equal to number of drain branch pipes. Drive of plug is arranged in cover of cylinder secured on drain branch pipes and is made in form of gear and two racks which are thrown into engagement. One rack is provided with movable pneumatic nozzle at its end which is brought in communication with holes in plate. EFFECT: enhanced reliability. 4 cl, 3 dwg