BACK VALVE FOR FLOW OF HIGH TEMPERATURE GAS Russian patent published in 2011 - IPC F16K15/02 

FIELD: machine building.

SUBSTANCE: invention is designed for implementation in pyrotechnics for propagation of flame force from pyro-igniter to charge at its initiation and for avoiding flow of high temperature high pressure gas in reverse direction. The back valve for flow of high temperature gas consists of a case with inlet and outlet channels and of a bush and shutoff element arranged in the valve. The bush has side orifices for flow of high temperature gas and the shutoff element axially travelling inside the bush. The bush is stationary set in the case. Side orifices in the bush are radial. On a side of the end facing the outlet channel internal side surface of the bush has a circular groove. Slots connecting the groove with the side orifices are made on external side surface of the bush. External diametre of the shutoff element is equal to internal diametre of the bush. An axial blind orifice is made in the shut-off element on the side of the outlet channel; this orifice is connected with the circular groove by means of radial orifices.

EFFECT: raised reliability of disconnection of inlet and outlet channels due to elimination of erosion effect of high temperature gas to sealing surface of shutoff element of valve.

2 cl, 4 dwg