FIELD: double-acting pneumatic and hydraulic systems. SUBSTANCE: bypass valve unit is provided with rod fitted inside sealing partition. Rod is provided with first and second passages inside it; ends passages are located on opposite sides from sealing partition. Sealing partition, first flexible shut-off member and second flexible shut-off member are combined in single shut-off member from flexible material. Second passage is made in form of groove on lateral outer surface of rod. Single shut-off member overlaps groove coming to outer lateral surface on one side from sealing partition and on opposite side from sealing partition single shut-off member is mounted in such way that groove extends beyond end of single shut-off member. According to second version, part of rod is taper in form and single shut-off member has hole communicated with groove. According to third version, groove comes to end surface of rod. EFFECT: enhanced reliability. 13 cl, 8 dwg
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