VALVE WITH DUPLICATING DRIVE Russian patent published in 2011 - IPC F16K31/143 

FIELD: construction.

SUBSTANCE: valve with duplicating drive comprises a gate with a spindle, the main pneumatic or hydraulic drive and a duplicating manual drive with a flywheel. At the upper end of the spindle there is a thread, which interacts with a sliding nut thread. The sliding nut is pulled through a sealant in the main drive cover, is installed in a rotary bush with a bottom and is coupled with it by the surface of its external faces or a key joint. The specified bush is connected to the manual drive flywheel and is installed in bearings on the main drive cover. The main drive piston is installed on the spindle with the possibility of the independent axial displacement of the latter to close the gate under action of the mechanical drive. A ledge is provided on the spindle, to which the piston is pressed with the sliding nut to provide for axial displacement of the spindle under action of the main drive. In open position of the gate, the sliding nut interacts with its ends with the piston and the bottom of the bush.

EFFECT: invention makes it possible to increase reliability and to reduce force required to close the gate valve with the help of the manual drive.

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