FIELD: manufacture of fittings; hydraulic systems fed by variable-capacity pumps. SUBSTANCE: shut-off member is made in form of bush whose end section has two bevels on side of seat which form acute between them in base. Outer bevel definite preset area for taking up pressure exerted on shut-off member. Shut-off member and seat are made from wear- resistant material to exclude their breakage at contact. EFFECT: enhanced stabilization of pressure in system; increased service life of valve without replacement of wear parts. 2 cl, 1 dwg
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