FIELD: instrumentation. SUBSTANCE: device measuring pressure differential includes instrument pressure converter, and valve unit incorporating flat cylindrical case which has inlet - plus and minus holes connected to feeding ducts, equalization duct and two outlets. Two shut-off valves shutting feeding ducts are built into case. Salient feature of invention lies in manufacture of inlet plus and minus holes in valve unit, in cylindrical surface of its case and of outlet holes in opposite end face surfaces to which two membrane dividers are attached. Dividers have outlets connected to pressure converter. There are dividing membranes which form two chambers formed by end face surfaces of case which communicate with outlets and equalization duct closed by equalization valve built into case of valve unit. EFFECT: improved operational reliability. 7 dwg
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