rhagfo wrote:
Chris Bryant wrote:
The solenoid valves are not perfect. Also, LP is extremely temperature sensitive, so after the pressure reaches equilibrium, negative pressure will be created when the temp drops, drawing air back in to the system.
Air should not be drawn into the system through a closed valve. Propane is capable of blowing out a match, and not ignite.
Personally I keep the system pressurized all the time. I believe far better for the valves, I have had several homes with gas never shout off the gas there either.
You should take one of those valves apart. You could then see how they are made to seal in one direction; that direction isn't perfect either.
If you built a valve that drew an amp or so, you could make it better at sealing.