Utilitech Expansion Tank?

It works just like a tire. If you push on the valve stem and no air comes out, then it's empty. Pump some air into it and see if you can register any pressure afterwards. Sometimes they ship them empty so you always have to check.

As long as you don't blow it up to anything ridiculous like 100 psi the diaphragm should be fine.

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Utilitech Expansion Tank?

I have a 5 gallon hot water expansion tank from Utilitech and I was wondering if there is any way you can remove all of the air pressure from it without hurting the rubber diaphragm that's built into the tank. it has a Schrader valve on it but when i push on it it doesn't release any air so...

But why would you? All you can do is make more room inside the tank for more water, increasing its weight. I doubt if your plumbing system is big enough to warrant a tank that big; none of my buildings has a tank that big and my largest individual hot water system covers about 45,000 square feet, serving 38 showers and about that many sinks over three floors. Three-gallon tank.

It's possible the tank's pressure has already leaked down. Have you checked the pressure? Have you tried ADDING any?

NOTE: to do that, you're going to need to turn off your water supply, and open a hot water tap somewhere. If the pressure in the tank has leaked down, you cannot compress water to make room inside the tank, if the tank has filled up. Opening a hot water faucet will allow the tank's expanding bladder to displace water out the tap as it fills.

Good luck with it.

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Well, there might be something funky about that valve - when you push the pin in the middle, it should let air out. If that doesn't give the result you're looking for, then find a valve core tool (bicycle shop will have them, or try the bicycle section at Wal-Mart, but don't hold your breath) and simply remove the entire valve core. If there's any pressure in there, that WILL let it out. And if no pressure comes out, it was already bottomed out.

If a car has both a cap on the radiator and the overflow/expansion tank, the cap on the radiator is a pressure releasing one which is set usually to 15psi. If there is only a cap on the overflow/expansion tank, that one is a pressure cap. On cars with a radiator cap, the overflow/expansion tank doesn't need to be pressurized. It is vented to atmosphere.

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Yes the only difference is the manufacturer, the will both accomplish the same thing, and are capable of running the same pressures

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