Self-purging probe for low pressure leak detection

Details Self-purging probe for low pressure leak detection Self-purging probe for low pressure leak detection

1980-05-19

1981-10-13

Petrakes, John

Measuring and testing

With fluid pressure

Leakage

73 498, G01M 332

Patent

active

042941075

ABSTRACT:
A self-purging fluid pressure adapter is disclosed which is connected between a fluid test pressure source, a fluid pressure gauge, and a fluid container undergoing a pressure test. The adapter rapidly purges fluid pressure from the pressure gauge when the container is disconnected from the adapter so as to quickly prepare the gauge for testing a next container on a conveyor belt. Two embodiments of the adapter are disclosed, the first operating on the jet pump principle and the second operating on the Venturi tube principle. In both embodiments the adapter includes a fluid pressure inlet chamber connected to the fluid test pressure source and a fluid pressure outlet chamber which is selectively connected to either the container under test or to an ambient fluid pressure. A high velocity fluid chamber is connected between the fluid pressure inlet chamber and the fluid pressure outlet chamber, for conducting the testing fluid from the inlet chamber to the outlet chamber at a minimum velocity when the container is connected to the outlet chamber while being tested. The high velocity fluid chamber conducts the testing fluid from the inlet chamber to the outlet chamber at a maximum velocity when the container is disconnected from the outlet chamber. A pressure gauge channel is connected to the fluid pressure gauge and has an orifice opening into the high velocity fluid chamber. The high velocity fluid chamber will have a fluid pressure which is substantially equal to the fluid pressure in the pressure gauge channel when the testing fluid therein has the minimum velocity, during the period when the container is being tested. The high velocity fluid chamber will have a fluid pressure substantially lower than the fluid pressure in the gauge channel when the testing fluid therein has the maximum velocity at the time when the container is disconnected after the test. In this manner, fluid pressure is rapidly purged from the pressure gauge when the container is disconnected, in preparation for the pressure testing of a next container on an assembly line.

REFERENCES:
patent: 3390569 (1968-07-01), McMeekin
patent: 3495441 (1970-02-01), Laub
patent: 3805594 (1974-04-01), Hayashi
patent: 3987664 (1976-10-01), Hass et al.
patent: 4019370 (1977-04-01), Allocco, Jr.
patent: 4157656 (1979-06-01), Walle
patent: 4172477 (1979-10-01), Reich

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