FIELD: machine engineering.
SUBSTANCE: valve device comprises an actuator for moving the valve stem comprising a body having an opening and a plunger located in the opening. A piston movably connected to the body for entering the opening. A lock is designed to hold the piston in a first position on the body. In this case, the plunger is movable by means of a liquid entering the opening through the piston. The piston is configured to move in the first position to stop liquid supply into the opening. The piston is configured to move in a second position to provide liquid supply into the opening. The piston is configured to move in a third position to functionally connect the piston to the plunger for providing manual activation and control of the stem movement.
EFFECT: increased reliability and efficiency of the valve device operation.
16 cl, 4 dwg
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