Method and apparatus to test for valve leakage in a pump assembl

Details Method and apparatus to test for valve leakage in a pump assembl Method and apparatus to test for valve leakage in a pump assembl

1993-11-03

1995-08-08

Berisch, Richard A.

Pumps

With signal, indicator, or inspection means

73 40, F04B 2102

Patent

active

054393558

ABSTRACT:
A method and apparatus for determining leakage, particularly of valves, in a pump assembly. A pump assembly (20) includes a primary valve (34) and a secondary valve (36), which may be selectively activated to control the source of fluid input to the pump assembly. The pump assembly also includes an inlet valve (42) and an outlet valve (50) disposed on each side of the pumping chamber (46). Downstream of the outlet valve is disposed a pressure sensor (54), which produces a signal indicative of the pressure of fluid within the pump assembly at that point. Leakage in the inlet or outlet valves is detected in the inlet or outlet valves by filling the pumping chamber with fluid, closing the inlet and outlet valves, and equalizing the pressure in the pump assembly distal to the inlet valve. After the pressure has been equalized, the outlet valve is opened and a reference pulse is determined as a function of the signal produced by the pressure sensor. The outlet valve is then closed and at least a partial pumping cycle is effected to pressurize fluid in the pumping chamber. The outlet valve is opened and a pressure pulse should propagate down the delivery passage from the pumping chamber. If the difference between the magnitude of the pressure pulse and that of the reference pulse is less than a predetermined value, either the inlet or outlet valve has leaked. The primary and secondary valves are checked for leakage in much the same manner.

REFERENCES:
patent: 4811252 (1989-03-01), Furuse
patent: 4818186 (1989-04-01), Pastrone et al.
patent: 4850807 (1989-07-01), Frantz
patent: 5000664 (1991-03-01), Lawless et al.
patent: 5336053 (1994-08-01), Wynkoop

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