Leak Near Home's Water Shut Off Valve

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jdao3

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Hi Everyone. Looking for some advice as to how I would repair this. There's a slow drip leak coming from near our home's water shut off valve. At the end of the cone shaped cap that located above the shut off valve, the leak is coming from where the nut/screw pieces are. I've tried tightening the nut and screw, but it didn't help. I've attached pictures. Thanks in advance!
 

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Reach4

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That is a pressure reducing valve (PRV). There may be a rebuild kit, but that might need replacing. Can you read a model number from that tag? If you get that valve replaced, you might want to consider having the shut off valve replaced with a quarter turn ball valve while you are at it. They are more reliable. That would require the water to be turned off at the street temporarily.

The screw is a pressure adjustment.

Usually when you have a PRV, you also need a thermal expansion tank.

I suggest you get a water pressure gauge to see what your water pressure is. If you get one with a garden hose thread, you could connect to a hose spigot, laundry tap, or the drain on the WH.
 

jdao3

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Thanks for the quick reply! The tag was a bit worn and this is all the info I could source from it. Does anyone know what the replacement part would correct replace it (and possibly a link to a part from lowes or home depot)?
 

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Gary Swart

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You need to be aware of a couple of things regarding a PRV. First, a PRV regulates your pressure. Well duh you say, but how is this done? You must have a pressure gauge, you can't just guess. Max pressure on the water supply is 80 psi, 50 to 60 is really better. Next is a thermal expansion tank. This tank is installed after the PRV and its pressure is set to match the PRV setting. This requires a bit of care since it is easy to pump in too much air and rupture the bladder in the tank. The thermal expansion tank installing instruction recommends a bicycle pump. An ordinary tire pressure gauge is best to test the pressure.
 
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