Sep 14, 2021 - 12:04 PM
The only 1"-20 fittings with check valves are the ones with male 1"-20 threads, such as ME417 or ME491 . They are designed to perform the same function as the check valve in a 1-lb disposable bottle. However, some male 1"-20 adapters do not have the check valve, such as ME492. It is not possible to put a check valve in a female 1"-20 fitting. A female fitting like ME488 would be on the appliance (lantern) side of the connection, where there would be very little gas escaping when it is disconnected. The male fitting would be on the pressure source side of the connection, where the gas would need to be shut off when it is disconnected. In that case, the check valve is directional. When disconnected, It will contain gas under pressure from a tank. If a high enough differential pressure is applied from the opposite direction, it will open the check valve as soon as the pressure gets high enough to overcome the spring that holds it closed.
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