FIELD: mechanical engineering; pipes and fittings; instrumentation; household appliances. SUBSTANCE: in addition to two shutoff members device has shutoff member in form of spring-loaded piston connected with drive through rod. Housing of device has one additional through and one additional outlet holes and bore arranged coaxially relative to inlet hole. Piston is placed in bore for overlapping inlet and through holes. EFFECT: enlarged operating capabilities. 2 dwg
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