| 摘要 |
FIELD: machine building. ^ SUBSTANCE: invention refers to pipeline accessories. The valve consists of a case with inlet and outlet channels. A multi-purpose gate assembled on a rod transferred with a drive is installed in the case. The multi-purpose gate is made four-stage and is equipped with an additional piston identical to the piston; the additional piston is assembled on the rod under the piston. The additional piston is located in a fixed tubular conjugated with the piston additional saddle with radial openings overlapped with an upper and lower stages in a closed position of the valve. A partition is installed between the saddle and the additional saddle. The latter separates the lower stage of the piston from the upper stage of the additional piston. Radial openings overlapped with the lower stage of the piston communicate with radial openings overlapped with the upper stage of the additional piston via a cavity created in the case. Radial openings overlapped with the lower stage of the additional piston communicate with the inlet channel. ^ EFFECT: increased reliability and operation life of valve. ^ 1 dwg |
