Texas Propane’s Propane Vapor Return Valves

Also known as the vapor equalizing connection or vapor equalization valve, the vapor return valve is required on all ASME propane tanks. Texas Propan typically uses this valve during hot summer months in Texas. In the event that liquid must be evacuated from the container, the vapor return valve will be used.

You go to a gas station in the morning and fill your car with gas, place the gas cap back on the tank opening and drive to work. If you were to go out to your car at lunch and open the gas cap, you would hear a hissing sound as you turned the cap. This hissing sound would be gasoline vapors escaping from your gas tank and you did not lose any gas. This is the same principle with regard to but propane but because propane is such a high pressure gas that will vaporize in the atmosphere, the excess pressure is removed during the filling process.

The vapor removed from the tank through the vapor return valve is much less than if it is removed through the safety relief valve.

These are just the basics of propane vapor return valves from Texas Propane. Don’t hesitate to contact us here at Texas Propane with the link below for more information!