Filter head with integral priming pump and valved bypass passage

Details Filter head with integral priming pump and valved bypass passage Filter head with integral priming pump and valved bypass passage

1992-03-11

1993-05-04

Drodge, Joseph W.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Check valve

1231799, 123196A, 123198C, 137527, 184 624, 184 628, 2104164, 210DIG17, 417310, B01D 35147, B01D 35153

Patent

active

052078981

ABSTRACT:
A head (10) for mounting a replaceable spin-on fuel filter element (12) for use in a vehicle fuel system, includes an inlet (18) and outlet (76). The inlet is connected in the head to a second chamber (24) through a first check valve (26). The first check valve enables flow only from the first chamber to the second chamber. The second chamber includes a manually actuated pump (28). The second chamber is connected to a fluid in-flow area (64) of the element through a second check valve (62). The second check valve enables flow only from the second chamber to the in-flow area. The first chamber is also connected to the in-flow area of the element through a third check valve (84). The third check valve enables flow only from the first chamber to the in-flow area of the element. To remove air from a newly installed element and to prime the fuel system of the vehicle, the manual pump is cycled. The pump moves fuel from the inlet of the head through the first check valve, second chamber and second check valve, pushing fuel and air through the element to the outlet. When the manual pump is used, the third check valve remains closed. When the engine of the vehicle is started, vacuum is drawn on the outlet of the head. Fuel then flows directly to the in-flow area of the element from the first chamber in the head through the third check valve, bypassing the pumping means.

REFERENCES:
patent: 3575296 (1971-04-01), Peterson
patent: 4437986 (1984-03-01), Hutchins et al.
patent: 4500425 (1985-02-01), Thornton et al.
patent: 4860713 (1989-08-01), Hodgkins
patent: 4935127 (1990-06-01), Lowsky et al.
patent: 4956081 (1990-09-01), Hodgkins et al.
patent: 4971528 (1990-11-01), Hodgkins et al.

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