FIELD: reinforcement bars production.
SUBSTANCE: invention relates to pipeline valves for large diameter pipes, can be used in oil, gas and chemical industry for transportation of gas, oil and other liquids. Pipe shutter comprising inlet and outlet holes of cylindrical valve body which are connected to inlet and outlet pipelines wherein coaxially to housing by means of partition wall with holes there is a blind cylinder with piston of larger diameter connected through rod with piston of smaller diameter located in cylinder, in volume of which there are holes, wherein the cylinders are aligned relative to the outlet of the pipeline, wherein the piston of large diameter on the side of the rod is spring-loaded, and on the other side between the blind wall of the cylinder there is a cavity which is connected to the inputs of the two valves by means of pipelines, wherein first valve output is connected with breechblock body volume while that of second valve with smaller-diameter cylinder chamber. Bellow bellows connecting piston of smaller diameter with baffle can be installed instead of spring.
EFFECT: reduced cost of the device and longer service life.
1 cl, 2 dwg
