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The last 3 posts

Friday, October 31st 2003, 12:14pm

by Rays Sprinklers

Definatly after the PVB. Not only does the PVB need to be before everything, but you are right that when the valve opens and closes there is a chance the PVB will start gishing water. It has to be under constant pressure

Wednesday, October 29th 2003, 12:45pm

by RVLI

Here is what I do:

Install the PVB, then take the pipe down into the ground and elbow it. Add a foot or so of pipe to that elbow then thread/glue on the master valve. It's better off to just install it after the PVB and put it in a 6" valve box.

Tuesday, October 28th 2003, 7:21pm

by segask

master valve and backflow preventer

I'd like to have a master valve on my system. My backflow device would be a PVB. Is it alright for the master valve to be in front of the PVB? Or does the PVB need to be under constant pressure in front of the master valve? I was wondering because the online installation guides at Watts Regulator website says that to properly place a PVB into service you first open inlet valve to pressurize the PVB and then open the outlet valve. If I had master valve opening and closing all the time in front of the PVB, then I guess the PVB would spit out a bit of water every time right? But would it prevent the PVB from properly protecting against backflow?