high initial pressure

[Jack]

all areas of the house have high initial water pressure then the pressure/flow drops after a few seconds. I have just replaced the pressure regulator thinking it might have been bad. Was also getting major hammering/noise when a faucet barely turned on (thinking it had too much pressure on it) Any other thoughts? I am definitely not a professional plumber, just a pretty good handy man. So I would really appreciate any assistance or ideas. Below are the house stats:

3/4 in copper in mech closet. presumably 1/2 in. to services 18 yr old house on slab, single story. no thermal expansion tank. hot water heater fairly new (built in 1994 according to EPA sticker). On unregulated faucet(front of house) great pressure/flow.

My wife and I just bought this house, so I can't give anymore history.

Thank you very much for your time. My email address is [e-mail]

Jack

[Dale Wilcox]

[Randy Anderson]

If you are getting a water hammer at one faucet you should check the faucet and or shut off on that faucet for junk in the line. This will cause a water hammer like noise.If it is at any faucet, check any valve up stream. Any difference between hot and cold?

Randy

[Mark Monson]

Check to see if the shut off for the whole house is a globe valve put in backwards. They come with an arrow that should point in the direction of flow.

MM

I am definitely not a professional