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150psi 500fahr valve, help!

I'm looking for a relatively easy to make or off-the-shelf valve that will be used to quickly release the steam from a 1.5 liter steel bottle with about a 2 inch to 3 inch mouth.

Some background - the steel bottle has rice or other grains inserted, closed shut with some valve or shutting device like a pressure cooker, and then heated to 150psi (I know, heat isn't in PSI but bear with me on this one). When the bottle reaches 150psi, the bottle is popped open quickly, thus exploding the grain kernels which release steam and become puffed. My guess is about 400 fahrenheit... your thermodynamics equations may tell me a better estimate but it's really moot since I'm after PSI - not heat.

I'm looking for a suitable design or off the shelf valve that will allow me to pop open the mouth, almost like popping the top off of a pressure cooker, but doing so safely - AND ECONOMICALLY (i.e. not thousands of $$) ~$100 would be nice. But remember the bottle shape - like a plastic Pepsi liter bottle but made of steel with 2 to 3 inch mouth.

Any ideas?

-Tracy.

Reply to
ricecube
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Actually, you need both a pressure and a temperature rating and there are standards for this, just as ther is for the pressure relief valve on you hot water heater.

There is a minimum temp for saturated steam of 385F at 150 psia,

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there is no practical upper limit, as the steam can be superheated and be at a the pressure. Your process will determine this.

---------- Ed Ruf Lifetime AMA# 344007 ( snipped-for-privacy@EdwardG.Ruf.com)

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Reply to
Ed Ruf

This design requirement has risen before: quick release fluid valve

-economic.

The application was the water-melon cannon which is rather impressive and is motivated by releasing 100 psi or so from an air reservoir pipe into the barrel. The usual choice of valve is the plastic ball valve, with a lever arrangement to open it quickly. The whole ensemble is usually codged up from PVC or ABS pipe by the way

Brian Whatcott Altus OK

Reply to
Brian Whatcott

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