Pressure control valve for a fuel system

Details Pressure control valve for a fuel system Pressure control valve for a fuel system

1995-05-09

1998-03-17

Miller, Carl S.

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

123497, 137116, F02M 3704

Patent

active

057275297

ABSTRACT:
A bypass pressure control unit for use in bypass relation to a fuel delivery line of a pump operated fuel delivery system for an internal combustion engine. The unit includes a housing that encloses a flexible diaphragm valve for defining with the housing a first bypass outlet chamber and a second fuel inlet chamber. The housing has a fuel inlet for communicating the second chamber with the fuel delivery line. The regulating valve is a flexible diaphragm membrane biased by a spring into direct engagement with a relatively large diameter valve seat formed in the housing so that the diaphragm itself acts as a valve member. The diaphragm is movable against spring force by a given pressure of fuel in the second chamber to disengage the diaphragm from the valve seat to thereby communicate the second chamber with the bypass fuel outlet. In one embodiment, the fuel outlet is formed in the housing and has a restricted orifice downstream of the valve seat. In a second embodiment, the fuel outlet is formed in the diaphragm itself so that bypass fuel is communicated to the first chamber from the second chamber through the diaphragm orifice and through an opening in the spring chamber of the housing back to the fuel canister. The unit is operable in an engine fuel system as a bypass maximum pressure relief control, a pulse dampener, fuel accumulator, closed system fuel pressurizer and/or system continuous bypass pressure regulator.

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