Closing spring assembly for slam-shut valves

Details Closing spring assembly for slam-shut valves Closing spring assembly for slam-shut valves

1977-10-06

1979-01-16

Weakley, Harold W.

Fluid handling

With repair, tapping, assembly, or disassembly means

With holding means functioning only during transportation...

137461, 251 73, 251303, 267167, F16K 2300

Patent

active

041344219

ABSTRACT:
A slam-shut valve provides overpressure protection in a pipeline in the event of regulator failure. The slam-shut valve is normally held latched in the open position. Overpressure or failure of the regulator will automatically trigger operation of the slam-shut valve to close the same and prevent further passage of the gas through the pipeline. The slam-shut valve is manually reset to the open position once it has been triggered closed.
The invention includes mounting the closing spring upon the lever in loaded position. The latch lever forms a subassembly, which in turn, is installed in the housing of the slam-shut valve to operatively interconnect the latch and release mechanisms and the reset mechanism. Subsequent to installing the lever, on end of the loaded closing spring is released from the lever to snap into position against the adjacent housing wall to bias the lever to the closed position. However, closing is normally prevented by the latch which releasably holds the lever in the open position.
The slam-shut valve has a valve housing to which is assembled a diaphragm housing. The lever will be installed with the diaphragm housing removed.

REFERENCES:
patent: 2673707 (1954-03-01), McRae
patent: 3268202 (1966-08-01), Murray
patent: 3422841 (1969-01-01), Farrer

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