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ZackFlag for Australia

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Pressure Relief Valve for Water

Heyas,

I am thinking of putting together a science project of sorts and I am wondering if this type of pressure valve exists.  I would like a pressure valve that releases water above it once the water pressure has reached a certain limit and automatically and reset without any need for any electrical components.  A very basic construction of what I mean ascii style.

|--------------------|
|Tank of Water |
|--------------------|
       |
       |
Pressure Valve
       |
       |
|--------------------|
|Water Catcher |
|--------------------|
       
Any assistance is welcome, I realise this is rather vague.

Thank you.
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d-glitch
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Water level and water pressure are directly related.  
If you are willing to work with level, a float valve (like the one in a toilet) can probably be made to work.

Which tank (pressure or level) are you trying to regulate?  The top or the bottom?

It it's the top tank, a float connected to a rubber flapper over the drain would probably work just fine.
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d-glitch
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Ditto MASQ.
These are  (were?) usually found on water heaters, if you want to see if you can scrounge one off something.
Sometimes called PopOff Valves.
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ASKER

Thank you for the info.