Fifteen bucks. Some scam. Replace it. More from ehow.com. This is filled with errors.

When water is used, the pump runs and after it stops, water comes out of the safety valve (about half a cup).

Heres your tank, (see image) and heres the factory explaintions.

Union Models: Include an SS union connection for installer convenience.

Heavy Duty Diaphragm: maintains air charge and is made of finest quality butyl rubber.

Separates air and water Interior Tank Lining: Standard models feature durable virgin polypropylene liner.

Maximum Working Pressure: 125 psi (except mounted pump models, 100 psi).

Stainless Steel System Connection: On all Stand, In-Line, Buried and Horizontal models.

Appliance Appearance Exterior Finish: Two coat high performance protection system.

Would you care to explain why they are there Back to you, Tom.

Looks something like this Water Tank Pressure Relief Valve - how to find, buy, install safety valves on water tanks and on well water systems Simply replace it.

Either your is opening too soon, or your valve is reading low.

Heres one: 34 x 12 Brass Pressure Relief Valve for Water Well Pressure Tank eBay.

HORSE HOCKEY Whens the last time you ever heard of that happening Thats what control boxes do.

In over 50 years out in the field Ive never run into this sort of thing happening, But Ill search the net to see if it ever happened and get back to you.

Bottom line here.

If safety valves were a necessary part of a bladder or pressure tank manufactures would, include them with the tank.

Regards Tom Heres what the manufactures say about exploding bladder tanks.

This is an alternative to tanks exploding which can be dangerous Read more: Signs of Well Water Tank Failure eHow.com.

Like I said, Its a scam to frighten you to purchase a safety valve you dont need.

The site I linked above isnt trying to get people to purchase anything.

There is a documented case of a plumber being killed by a tank that blew mentioned in that article.

Right Your quote is not from a manufacturer, its from the ehow.com site, which is simply a help site not unlike this one.

A hot water heater is a pressurized vessel, so are we to believe they dont need a TPR BTW, if anyone thinks ehow is a great site, read this laughable article on supposedly adjusting a water well pressure relief valve, when what they are actually doing is describing how to adjust the pressure switch.

How to Set the Pressure Relief Valve on a Well Pump eHow.com.

Fifteen bucks. Some scam.

Replace it. More from ehow.com.

This is filled with errors.

Aqua Air V60 Pressure Tank