DRAIN VALVE (DESIGN VERSIONS) Russian patent published in 1998 - IPC

FIELD: mechanical engineering; gas-turbine engines. SUBSTANCE: valve designed for bypassing air has piston one end of which is located inside box arranged on one side of path of liquid flow through bypass. Other end of piston is located in hole between liquid primary flow path and liquid flow path through bypass so that valve open and closes in response to pressure drop between two points on liquid primary flow path. EFFECT: possibility of disconnecting and servicing valve without disassembling engine, guaranteed minimum resistance to flow through bypass. 10 cl, 6 dwg