FIELD: valving. SUBSTANCE: guide member of the safety valve is made up as a sleeve. The sleeve is mounted inside the housing with the use of a threaded joint. Inside the sleeve are locking member, supporting plate, and spring interposed between them. The ring stop surface is defined by a bore made in the sleeve. The cylindrical surface of the periphery circular expansion of the locking member is in a contact with the surface of the bore which is a guide for it. The bottom of the sleeve is provided with a threaded opening. A screw member passes through the threaded opening. The screw member interacts with the supporting plate. EFFECT: enhanced reliability. 2 dwg
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