Sizing a Pressure Reducing Valve

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Old 06-17-08, 06:19 PM
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Sizing a Pressure Reducing Valve

I need to install a pressure reducing valve in my home but I can't seem to find anything that tells me what size valve to get. How do I figure out what size valve to buy?
 
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Old 06-18-08, 04:47 AM
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I might add that I have two baths, a dishwasher, and a washing machine. I do not have a lawn sprinkler system. The local Lowes carries two Watts PRVs; a 1 inch, 38 GPM (at 20 psi drop) model, and a 3/4 inch, 22 GPM (at 20 psi drop) model. I don't want to undersize the PRV and kill the flow rate in the house and I'm told that an oversized PRV is not good either.
 
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Old 06-18-08, 07:45 AM
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Hello

Why have you determined you need a PRV ?

If your water service is only 3/4" and you have high pressure already, and taking into consideration the fixture count you gave me, and if I am reading the chart correctly, you will be fine with a 3/4" PRV .

If your main is 1" I would just stay with 1" so you do not restrict the flow. But I would only think you would need 1" if you had low water pressure.
 
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Old 06-18-08, 08:09 AM
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I have a 3/4" main and I'm running 100 psi (static) in my house so I need to bring that down. My pipes are banging when the water shuts off at any faucet, toilet, or other valve.
 
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Old 06-18-08, 08:11 AM
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OK, you will be fine with a 3/4" BFP, set at about 60psi
 
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