Positive stop diaphragm assembly for fuel pressure regulator

摘要

A fuel pressure regulator (10) for use with an internal combustion engine includes a housing (12) a valve assembly in the housing, an elastic diaphragm (34) connecting the valve assembly to the housing, a stop (58) on one of the housing (12) or the valve assembly and a spring (22) between the housing (12) and the valve assembly. The housing includes an inlet (14), an outlet (16) and a longitudinal axis. The valve assembly is displaceable along the longitudinal axis by an opening distance when a fuel pressure at least equal an overpressure amount acts on the diaphragm so that the diaphragm does not exceed its yield strength. The diaphragm (34) is in fluid communication with the inlet (14) and elastically displaceable along the longitudinal axis up to a maximum distance. The stop (58) is spaced from the other of the housing (12) or the valve assembly along the longitudinal axis by a travelling distance (Dt) when the valve assembly closes the fluid communication between the inlet and the outlet. The travelling distance is at most equal to the maximum distance and substantially greater than the opening distance.