FIELD: valving. SUBSTANCE: lesser steps of seat and bushing have the same lengths. A plate is provided with a bore having a ring groove on cylindric surface from the side of the seat and a sealing ring is received in the groove. A through hole is provided in the bottom of the plate. The plate is provided with washer which is in contact with walls of the bore, has diameter equal to outer diameter of lesser step of the bushing, and thickness equal to depth of the bore. The washer is mounted for axial reciprocation. The through side hole of the seat is plugged tightly. An arrester is made of a washer rigidly secured within the case. EFFECT: enhanced reliability. 1 dwg
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