Self acting valve that prevents in reverse flow of operating me- dium designed for water, water steam, gases and other operat- ing media used in power engineering and chemical industry in dependence upon body material selection, for normal, tropi- cal, explosive and seismic environments.
The body is formed by a die forging that is closed with a screwed cover. The seat in the body and the plug sealing surface are made of a hard surfacing alloy. The cover is sealed with a graphite seal- ing ring. Operating is automatic. The valves can be fitted with a spring – in such a case, they can be installed in any position
The piston check valves are tested with water (upon client re- quest even by steam) for strength, impermeability, operation ability and tightness according to operating parameters and body material. Minimum strength testing pressure is 1,5 fold of PN.
The valves are installed in horizontal piping with the screw joint facing upwards, with the direction of flow aimed under the plug.
Flanged and butt-welded as per CSN, DIN, ANSI, GOST standards.