Detecting and automatically responding to airborne hydrocarbon gas

1. A method of controllably delivering hydrocarbon gas, comprising:

selectively opening and closing a valve to control the flow of hydrocarbon gas from a pressure vessel to a supply line for a hydrocarbon gas-fueled device;

detecting any airborne hydrocarbon gas;

attempting to move the valve from an open state to a closed state in response to detecting airborne hydrocarbon gas while the valve is in the open state; and

releasing a liquid sealant to the supply line, including automatically puncturing a pressurized sealant container containing the liquid sealant and guiding the released sealant into the supply line, in response to detecting escaped gas after at least attempting to move the valve to the closed state.

2. The method of claim 1 , further comprising:

selectively closing the valve according to an electronically-stored schedule.

3. The method of claim 2 , further comprising:

receiving user input including one or more scheduling parameters; and

configuring the electronically-stored schedule according to the user input.

4. The method of claim 1 , wherein the step of attempting to move the valve from an open state to a closed state comprises operating a prime mover to automatically urge a mechanical valve actuator.

5. The method of claim 4 , wherein operating the prime mover to automatically urge the mechanical valve actuator comprises rotating a valve knob using an electric motor.

6. The method of claim 1 , further comprising:

automatically attempting to move the valve to the closed state in response to detecting the escaped gas at a predetermined threshold value.

7. The method of claim 1 , wherein the step of detecting any airborne hydrocarbon gas includes use of a hydrocarbon gas sensor.

8. The method of claim 1 , wherein the liquid sealant is delivered into the supply line upstream of the valve.