Patent ID: 9182052
Filing Date: 2015-11-10
Classification: F16K,Y10T

Abstract:
1. A gas shut-off valve assembly comprising: a valve movable between an open position that permits gas flow through the gas shut-off valve assembly and a closed position that prevents gas flow through the gas shut-off valve assembly; a motorized drive configured to move the valve between the open and closed positions; and a control circuit that includes or is associated with a pressure detection circuit and a valve position detection circuit; wherein said control circuit is configured to close the valve via the motorized drive in response to detecting a closure condition, and is further configured to initially verify valve closure based on directly or indirectly detecting movement of the valve into the closed position, and to subsequently verify valve closure based on monitoring gas pressure on a downstream side of the valve, after said initially verifying valve closure; wherein said control circuit is configured to monitor the gas pressure based on measuring gas pressure at different times and evaluating the measured gas pressure over time, to determine a valve closure status as closed or not closed; and wherein the control circuit is configured to retry valve closure one or more times, responsive to determining the valve closure status as not closed.