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Old 04-21-2011, 08:27 AM   #1
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Water Main Mystery Device


Hey, guys.

The water pressure in my townhouse has always been pretty weak. My neighbors do not have the same issue. Recently, I've been suspecting this...umm...thing. Where the water enters my house, this device sits between two gate valves. What is it? Do I need it? If it does have something to do w/ my low water pressure, is it adjustable/replaceable/removable?

That 'range' entry on the tag makes me think it's a pressure control device of some sort, but I am definitely well below 25.

Thanks!




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Last edited by ink; 04-21-2011 at 08:30 AM.
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Old 04-21-2011, 08:32 AM   #2
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Water Main Mystery Device


I'm not a pro plumber, but you're exactly right...that is a pressure control valve, normally installed to reduce public water pressure that is too high. It is adjustable. Loosen the nut on the right and turn the threaded rod up or down to increase or decrease the pressure to suit.
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Old 04-21-2011, 09:10 AM   #3
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Water Main Mystery Device


It's called a pressure reducing valve (a.k.a. - PRV.)
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Old 04-21-2011, 09:39 AM   #4
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Water Main Mystery Device


It works backwards of how you might think...once you loosen the nut to make adjustment possible, tighten that rod to increase pressure, loosen the rod to decrease.

I'd get a pressure gauge, hook it to the outside hose spigot closest to the main, and slowly increase your pressure until you are at a more comfortable level, but definitely do not go over 70-80ish. 65 would probably be good.

Pressure gauges look like this:
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Old 04-21-2011, 09:48 AM   #5
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Water Main Mystery Device


Thanks everyone.

Quote:
Originally Posted by secutanudu View Post
It works backwards of how you might think...once you loosen the nut to make adjustment possible, tighten that rod to increase pressure, loosen the rod to decrease.

That probably saved me a lot of frustration later. Awesome.

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