Fuel system having dual fuel pressure regulator

摘要

A pressure regulator is disclosed having a body, a valve seat dividing a cavity of the body into first and second portions, and an end stop movable against a bias to selectively engage the valve seat and isolate the first and second portions. The pressure regulator may also have a first inlet port in the first portion, a first outlet port in the second portion and in fluid communication with the first portion via the valve seat, and a second inlet port in the second portion. The fuel system may also have a valve element in the second portion and movable against a spring bias based on a pressure difference between an open position and a restricted position against the end stop. The fuel system may additionally have an actuator biased to urge the valve element toward the second position and selectively actuated to move away from the valve element.

主权项

1. A pressure regulator, comprising:
a body; a cavity formed in the body; a valve seat dividing the cavity into a first cavity portion and a second cavity portion; an end stop disposed within the first cavity portion and movable to selectively engage the valve seat and substantially isolate the first cavity portion from the second cavity portion, the end stop being biased against the valve seat; a liquid fuel inlet port disposed in the first cavity portion; a first outlet port disposed in the second cavity portion and in selective fluid communication with the first cavity portion via the valve seat; a gaseous fuel inlet port disposed in the second cavity portion; a valve element disposed in the second cavity portion and movable based on a pressure difference between the liquid and gaseous fuel inlet ports to any position between a first fully open position at which fluid is allowed to flow from the liquid fuel inlet port through the first outlet port substantially unrestricted by the valve element, to a second fully restricted position against the end stop at which fluid flow from the liquid fuel inlet port through the first outlet port is blocked by the end stop, wherein the valve element is biased toward the second position; and an actuator biased to urge the valve element toward the second position and selectively actuated to move away from the valve element.