Understanding How a PGV Irrigation Control Valve Works, PGV-101G
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- Опубликовано: 2 май 2024
- Understanding How a PGV Irrigation Control Valve Works, PGV-101G
00:00 - Intro
00:35 - About the PGV
01:40 - External components
03:20 - Internal components
05:15 - What keeps a valve closed?
05:37 - What causes a valve to open?
06:36 - Closing an open valve
07:02 - Recap PGV
• External Components of a Valve
• Internal Components of a Valve
• What keeps a valve closed?
• What causes a valve to open?
• What happens to cause an open valve to close again?
Valves are the heart of an irrigation system. To simplify valve installation and maintenance and ensure long-lasting system performance, it’s important to understand how these components work.
In this video, we’ll identify the different components of a valve, including the parts visible on the outside as well as those on the inside. We’ll also show you how water travels through a valve and explain the forces that cause a valve to open and close. 
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I know very little about sprinkler systems. One of our valves was leaking and doing the flush in this video fixed my problem. Thank you!
It's 3:30am and I couldn't quite fall asleep until I knew exactly how the valve worked. Excellent video!
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Great explanation of how these values work. Thanks
Ugh somebody help me out. One of my two PGV valves developed a slow leak; I replaced the top bonnet with a new one from Home Depot. That fixed the slow leak. But now, when the valve is opened, it shoots a jet of water out the side. Based on the video, the water jet is coming out where the bonnet exhaust port is; and it happens as soon as the downstream pipe is full (i.e. exactly at the 3:00 mark in the video). I have unbolted and reseated the bonnet multiple times, and the diaphragm is new and no sign of debris around the edge of it. But I'm always getting a water spray out of that same spot. Do I need to replace the entire valve?
Thanks guys! You helped me troubleshoot my system. $9 part and it works perfect!
Glad it helped.
Very clear explanation, thanks so much.
Glad it was helpful!
Wow, love the high tech video. Best one online...lot of terminology and explanation. Still don't quite get the pressure gradient and channels sequence...more arrows please...
The problem I had was I was randomly getting both zones watering at the same time. At first I thought it was my program controller and maybe a defective diaphragm. I have two zones. Zone 1 is three feet higher in elevation than zone 2. Both zone valves are located at the level of zone 2. When the program interval for zone 1 was complete, gravity pressure would open its anti-siphon valve and essentially drain all the water from the zone 1 pipes. The horror of it all! I live in a desert so wasting water is a cardinal sin. The second problem here is I setup both zones to irrigate back to back (zone 1 turns off at 8:00 PM and zone 2 turns on and 8:32 PM). The problem here is zone 1 was still draining through the anti-siphon valve when zone 2 turned on. Since zone 1 was still draining through the anti-siphon valve the pressure differential that holds the valve diaphragm for zone 1 closed, wasn't there. When zone 2 turned on its pressure forced open the diaphragm of the valve in zone 1 meaning BOTH zones were turned on at the same time, resulting in half the water for the plants in both zones 1 and 2.
I solved the problem two ways: First, I reversed the order in which I irrigate. I adjusted the program to turn on the zone 2 first, which is at the same level of both irrigation valves. Its anti-siphon valve closes almost immediately after watering. I then set the "On" time for zone 1 to come on 5 minutes after zone 2 turns off to ensure adequate drainage of zone 2 through its anti-siphon valve and establish adequate pressure on the valve diaphragm for this zone. This fixed the problem of both valves being open due to water pressure. To fix the wasteful water draining from zone 1, I eventually put a check valve in zone 1. This stopped the waste of water from zone 1.
I thought these lessons might be useful to other battling irrigation system problems since I find real world solutions in the comments of these videos, sometimes way more helpful than the video itself.
Thank you for the help greatly appreciate it!
You're welcome!
What's a good setting for the diaphragm, the screw in the middle of the bottom?
Would low water pressure situations affect the PGV? Would it remain closed?
Very helpful!
Glad it was helpful!
During the winterization of the system, the blow-out port should be on inlet side or outlet side?
Interesting fact and very informative, thank you sir!
Glad it was helpful!
Wht dose pvg stand for?
What’s the difference between using flow control and using your Accu-Sync valve pressure regulator? I’m trying to adjust 1 of my 16 zones (coming from a 2HP sprinkler pump at an always consistent but pretty high psi) down to use 5 bubblers for this one zone along the fence. Ideally, I was thinking I could use the flow control for this and regulate all 16 zones to the appropriate psi. But it confuses me that there is a $65 pressure regulator accessory that is sold as well. I’m not understanding how they differ from the flow control that is already built in.
I'm confused as well. Hopefully Hunter can explain.
I think it's better just get an water pressure regulator or a valve with pressure regulator
Flow and pressure aren't the same thing. The accusync lowers pressure with less flow loss. Pressure reducers don't reduce pressure by restricting flow. Rather they use a plunger that pulls back and creates a suction force that tries to pull the water backwards, thereby reducing its velocity and psi. Basically, it takes advantage of the principles that cause backflow. The practical benefit is that you can run more emitters on one drip zone than you could by restricting the flow rate.
Fantastic video my next valve purchase will be a hunter!
Does solenoid need to be energized all the time we want water to flow or is it enough to energize it for a few seconds until the chamber changes pressures?
It has to be active all the time for the valve to open. The solenoid activates a tiny electromagnet and if the current is off, the metal plunger will drop, causing the valve to close.
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Thank you
My IQ just increased by a couple of points. Thank you.
I used Rainbird’s DV100 for many years but switched to Hunter in 2021, so far Hunter has been very reliable.
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starting an apartment maintenance job in 8 hours. I told them I have extensive irrigation experience. Now I know everything lol.
Sounds like a gamble but we're glad that you learned something from the video.
I maintain a 4 house estate and pull water from a river behind the property and there’s a little over a 100 PVG valves and on occasion I will have a valve just stay stuck on. Sometimes I will find a pebble inside from a break in a supply line but most times I find nothing. Sometimes just flushing the valve out while open does it but sometimes it still stays stuck open or will do it the following week. If this happens I will just replace the top 1/2 with a new one and most of the time that works but not always. I wish I could know why they stay stuck open. The weird thing is it’s usually the same 2-3 zones that malfunction even after replacing the entire valve. Can you tell me why a valve would do this?