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I don't know how remote your sensor is relative to the valve. Don't know what temperature range or pressure range you're working with. Don't know if you'll need electrical or gas (pneumatic) actuation of the valve, or if you want a spring to close valve with a remote controller to hold it open. Don't know what safety features you need....
But you'll likely have to piece this together without spending a lot of money.
You can probably get a temperature switch, a relay and a solenoid valve cheaply. Then wire it all together. A normally closed solenoid valve, energized to keep open via the relay and a normally closed switch would work. If you ever lose power to the solenoid, it would close the valve. If your circuit is compromised (short or failed temperature switch), it would close.
Be sure the pressure rating on the valve meets your conditions. If you need manual reset, get a locking relay.
Lots of possible solutions.
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