Pressure responsive safety interlock

Details Pressure responsive safety interlock Pressure responsive safety interlock

1985-04-08

1986-05-20

Hall, George T.

Receptacles

Closures

Having means for securing or retaining closure in its closed...

B65D 4500

Patent

active

045895660

ABSTRACT:
A safety interlock device is provided for preventing the opening of a vessel containing a pressurized fluid. In a typical application, the interlock device may be used in industrial applications to prevent the inadvertent unscrewing of a cap from the end of a large pressure vessel containing a hazardous gas. A pressure port end of the interlock body is adapted for threaded engagement with the vessel and is open to vessel pressure. A pressure-responsive locking piston movable within the body prohibits removal of a stem when vessel pressure exceeds a selected minimum pressure. A chain may be secured at each end to the stem and vessel cap, so that the cap cannot be unscrewed to open the container unless the stem is first removed. In one embodiment, the locking piston is prevented from manual override by the position of a second piston and a plurality of ball members locked in a groove.

REFERENCES:
patent: 4139118 (1979-02-01), Parker
patent: 4367823 (1983-01-01), Raver
patent: 4452372 (1984-06-01), Rolins

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