Pressure relief valve for positive pressure pumps

Details Pressure relief valve for positive pressure pumps Pressure relief valve for positive pressure pumps

1990-04-11

1991-10-01

Casaregola, Louis J.

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

417440, 417477, 251 6, F04B 4312, F04B 4908

Patent

active

050529005

ABSTRACT:
A pressure relief valve for positive pressure pump systems in which fluid is displaced from the inlet to the outlet of the pump. The pressure relief valve includes a bypass tubing member interconnecting the outlet and a lower pressure area such as the inlet. Pressure limiting means normally occlude the bypass tubing to restrict flow when the outlet pressure of the pump is below a predetermined level and responds to pressure above a predetermined level to shunt fluid from the outlet to the inlet. In the preferred embodiment, the pressure limiting means consists of bar-like members which engage the exterior of the tubing and are biased to compress the bypass tubing to a flow restricting position by elastic bands extending around the bar-like members.

REFERENCES:
patent: 2245030 (1941-06-01), Gottesfield et al.
patent: 2819864 (1958-01-01), Marks
patent: 4470767 (1984-09-01), Frings et al.
patent: 4828462 (1989-05-01), McBurnett

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