F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/35
F16K 31/52 (2006.01) F16K 1/20 (2006.01) F16K 17/00 (2006.01) F16K 39/02 (2006.01)
Patent
CA 1061678
Reset Assembly For Slam-Shut Valves Abstract of the Disclosure. A slam-shut valve or overpressure shutoff device used in series with, and upstream of, a pressure regulator to provide overpressure protection for apparatus downstream of the pressure regulator in the event of regulator failure. Over- pressure or failure of the regulator automatically triggers 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 normally in the open position, and the invention provides for manually re- setting the slam-shut valve to reset it in the open position once it has been triggered closed. The valve element is carried on a lever which is pivotally mounted on a reset shaft and spring-biased to close, but prevented from closing by the latch which releasably holds the lever in the open position. The reset shaft is turnable from an external fitting, but will not function until the shaft has been depressed to lock a bolt head in the correspondingly shaped socket of the lever, whereby on rotation of the shaft, the lever will be raised to re-engage the latch and once again hold the slam-shut valve in the open position. The reset assembly is used subsequent to the overpressure condition being corrected. A further safeguard is embodied in the reset assembly by use of an equalizing valve interconnecting the lever and valve-element, and being automatically operated to equalize the pressure upon the initial movement of the reset shaft during the resetting operation.
274689
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