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  #1  
Old 06-27-2012, 05:13 PM
mrsteve mrsteve is offline
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Rain Bird PEB flow control

I was checking a property today that has high pressure and decided to try and regulate it with the flow control on the master valve. First I took a reading (all dynamic) at a spray head near the higher elevation of the system, it was 72psi. Then took another station that was slightly smaller in gallons and lower in elevation, it was 80psi. With the gauge still connected I started to turn down the flow control on the master, all the time checking the pressure. I had to go down to where I was only about one turn from closed to make a reduction. The head that was 80 is now 50, and the head that was 72 is now 40. I didn't want to go any lower because I have two rotor sections. It seems to work, the valve wasn't hissing nor did it snap close. What are the concerns with this approach to reducing pressure?
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Old 06-27-2012, 06:34 PM
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Wet_Boots Wet_Boots is offline
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cheapsh!t way to operate when a module added to the valve gets you true regulation
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Old 06-27-2012, 06:42 PM
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greenmonster304 greenmonster304 is online now
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Quote:
Originally Posted by Wet_Boots View Post
cheapsh!t way to operate when a module added to the valve gets you true regulation
This module is only like $40.
Posted via Mobile Device
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Old 06-27-2012, 06:46 PM
mrsteve mrsteve is offline
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Originally Posted by Wet_Boots View Post
cheapsh!t way to operate when a module added to the valve gets you true regulation
I'm listening. What do I gain? I've got a regulator on a zone valve and wonder what's the difference. Tell me why and I'll put a prs dial on this master. Especially if it is going to damage something. Even with the dial you are closing the flow way down.
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Old 06-27-2012, 06:48 PM
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irritation irritation is offline
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Originally Posted by mrsteve View Post
What are the concerns with this approach to reducing pressure?
I find temperature and humidity both effect how flow control works. Same with using the screw on spray nozzles.
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Old 06-27-2012, 07:21 PM
Duekster Duekster is offline
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That is a pretty good valve. Flow control is not pressure controll however.
Work off the furthest run first then balance the rest at the station valve.

Best you can do with what is at hand but you could recommend pressure compensation.

If you ask here you will get more of the same type of advice from all concerned.
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Old 06-27-2012, 07:22 PM
Duekster Duekster is offline
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Originally Posted by Wet_Boots View Post
cheapsh!t way to operate when a module added to the valve gets you true regulation
Still better would be at the head regulation.
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  #8  
Old 06-27-2012, 07:24 PM
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Mike Leary Mike Leary is offline
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Originally Posted by irritation View Post
I find temperature and humidity both effect how flow control works. Same with using the screw on spray nozzles.
Not to mention what phase the moon is in.
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Old 06-27-2012, 07:37 PM
Duekster Duekster is offline
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Not to mention what phase the moon is in.
That is your period...
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Old 06-27-2012, 07:37 PM
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Still better would be at the head regulation.
not when the head gets more pressure than the body and cap are rated for - knock it down at the master valve first
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