DOUBLE-ACTING VALVE Russian patent published in 2009 - IPC B64D37/00 F02M59/46 

FIELD: aircraft engineering.

SUBSTANCE: invention relates to fuel feed devices, namely to devices feeding fuel into fuel tanks. Proposed valve consists of the body, its top housing a drain valve and its bottom accommodating fuel overflow valve driven from the said drain valve. Aforesaid drain valve comprises a cylindrical chamber that houses an axial needle, its top being furnished with flat-to-flat seat and its bottom accommodating a shut-off element. Aforesaid body comprises needle shut-off element seat and inlet drain orifice that communicates with the drain valve chamber arranged under the seat, and outlet drain orifice communicating with the drain valve chamber arranged above the said needle seat. The said body comprises also fuel overflow needle shut-off element seat and fuel overflow line inlet and outlet orifices communicating with overflow valve chambers arranged above and below the needle seat. Axial orifice is arranged between the drain and overflow valves to accommodate stem. Note here that seal ring is fitted between the said stem and aforesaid orifice communicating aforesaid chambers. Note also that the valve needle features a spring to displace the needle shut-off element from the seat.

EFFECT: reduced fuel flow rate in engine start.

3 cl, 1 dwg