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Question:

What air pressure valve do I use for vacuum chamber?

I am making a vacuum chamber and need to suck the air out by a tube. What valve do I use? Pin valve, ball, or ? What are they typically called? Compression valves? What if they are designed for water?

Answer:

Any valve rated WOG (water, oil, gas) is OK for vacuum. Maximum vacuum pressure differential is atmospheric pressure (14.7psi, 101.3kPa, 1 bar). For convenience, you might use a barbed valve which is sized for tubing (See Yahoo! Images: barbed conical gas valve). Any plumbing and heating supply, or commercial cooking equipment supply will have a variety of miniature bronze gas valves to choose from.

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