Vent-relief valve for a wet motor gerotor fuel pump

Details Vent-relief valve for a wet motor gerotor fuel pump Vent-relief valve for a wet motor gerotor fuel pump

F - Mech Eng,Light,Heat,Weapons

04

C

103/150, 137/7

F04C 15/00 (2006.01) F02M 37/20 (2006.01) F04B 53/06 (2006.01) F04C 2/10 (2006.01) F16K 17/00 (2006.01) F16K 17/04 (2006.01)

Patent

CA 1247935

ABSTRACT OF THE DISCLOSURE A fuel pump vent-relief valve for venting a vapor pressure less than a fluid pressure and relieving the fluid pressure when in excess of a predetermined relief pressure includes a valve body having an inlet passage, an outlet passage, and a valve bore containing a ball valve and a tubular valve, the tubular valve and the valve body cooperating to define d relief passage between the inlet passage and the outlet passage. The pump includes a first spring located between the ball valve and the tubular valve acting to bias the ball valve towards the inlet passage and the tubular valve towards the outlet passage, the hall valve adapted to cooperate with the inlet passage to establish a vapor bypass passage therebetween when the ball valve contacts the inlet passage, and the tubular valve having a vent passage therethrough adapted to be closed by the ball valve; and a second spring located between the tubular valve and the outlet passage for biasing the tubular valve towards the inlet passage, to normally close the relief passage; such that the vapor pressure is vented through the bypass passage and the vent passage until the fluid pressure overcomes the first spring to cause the ball valve to close the vent passage and such that fluid pressure is relieved when the relief passage is opened when the fluid pressure exceeds a predetermined relief pressure to urge the tubular valve towards the outlet passage to open the relief valve.

469431

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