Engine protection valve

Details Engine protection valve Engine protection valve

1993-12-17

1995-03-28

Kamen, Noah P.

Internal-combustion engines

Starting device

For airplane

123 4115, F02B 7700

Patent

active

054007526

ABSTRACT:
An engine protection valve to cut off flow of fuel to the engine when oil pressure drops below a predetermined level, comprising a piston 5 slidable in a bore 4 of a housing 2, the piston having a series of seals thereon which divide the bore into three chambers 20, 22, and 24. The chamber 20 has a fuel inlet 6 and a fuel outlet 7, and a valve seat 8 located between the fuel inlet and outlet. A restricted orifice 36 allows a restricted amount of fuel to pass from the chamber 20 to the chamber 22 thereby lubricating the bore 9 of chamber 22 and allowing the seal 16 to slide smoothly on the bore 9. The chamber 22 is kept at atmospheric pressure to enable the valve to operate and fuel to drain from the chamber 22 to the fuel tank through the conduit 40. An alternative arrangement is to lubricate the chamber 9 and seal 16 with engine oil from the chamber 24. The engine oil may be conveyed to the chamber 22 through a passage extending down the stem of the piston where after the oil drains from chamber 22 to a sump.

REFERENCES:
patent: 3590798 (1971-02-01), Goodwin
patent: 4067348 (1978-01-01), Davis
patent: 4476825 (1984-10-01), Mills
patent: 4616806 (1986-10-01), Davis

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