Wilkins 720A 1" in. PVB Backflow Preventer
- Wilkins 720A (WK720A-100) Backflow Preventer
- Female Pipe Thread
- 1 inch
The Zurn Wilkins 720A Pressure Vacuum Breaker Assembly is used in high hazard applications for back siphonage protection. Applications are primarily non-potable residential and commercial irrigation systems. Designed for installation on irrigation water lines to protect against back-siphonage of contaminated water into the potable water supply. Assembly shall provide protection where a potential health hazard exists.
Features & Benefits
- ASSE Listed 1020
- IAPMO Listed
- CSA Certified
- Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
- Sizes: 1/2", 3/4", 1", 1 1/4", 1 1/2"
- Main valve body Cast Bronze ASTM B584
- Fasteners Stainless Steel, 300 Series
- Elastomers Silicone (FDA approved), Buna Nitrile (FDA approved)
- Polymers Polypropylene (FDA approved), Delrin (FDA approved)
- Springs Stainless Steel, 300 series
Irrigation systems supplied by domestic or private potable water systems are considered to be a potential pollution hazard to the water supply. These systems must include protection to prevent possible backflow of irrigation water into the potable water supply.
Federal law requires a proper backflow device to be installed on any watering system to prevent contamination of the supply; whether it be pump or city water. Check your local water authority for installation requirements & codes. In many rural areas; specific requirements for landscape irrigation systems may not be covered in local plumbing codes and/or enforcement may be limited. HOWEVER...limitation in local authority does not alter the basic requirement for protection of the potable water supply.
Related Articles & Videos
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- Pressure Vacuum Breaker (PVB)
- Double Check Valve Assembly (DCVA)
- How To Winterizing Your Sprinkler System
|Pipe Size||5 ft/sec.||7.5 ft/sec.||10 ft/sec.||15 ft/sec.|
1 year ago
1 year ago
5 months ago
1 year ago
An interior part of my original 720A was damaged (cracked) in the freeze. I took all the interior parts from the new one and installed them into the old body of the old one and it works fine.
If in doubt, go with the 1". You can always bush it down to 3/4" if you have to.
This is the process that I use, and have used for the last 13 years of working on and installing sprinkler sytems, for startup in the spring.
1. make sure large valves on back flow are open, small ones closed.
2. turn on sprinkler timer/controller so that one zone is on
3. Slowly turn on the water supply valve that supplies the sprinkler system until completely open.
4. go through each zone to make sure valves are working, make adjustments, and check for leaks.
Water will flow out of the top of the backflow preventer untill the pressure equalizes in the system and then it should stop. This is normal when starting up the system.
Second, the backflow preventer crack due to weather.
What covering is best use during the winter.
2nd question: I've had similar problems. After blowing out the system in the fall... close off both sides of the valve and shut off the water from the house to the backflow preventer. If there is a rupture then at least it will be in cheap (relatively) copper pipe instead of this item. If you have any petcock (sp?) drains open them - they look like giant wrist-watch-winders. They allow the pipes to drain if any of the valves have a leak (our valves all leak a little).
It looks like the main mechanism is okay.
Can you buy just the plastic cap?
Now, making sure that you have enough 1" couplers, and some extra 1" PVC pipe, use a hack saw, or PVC pipe cutter tool to re connect the unit to the old pipes. Be sure to use some sand paper to clean up the inside of the couplers, and the OD of the PVC pipe....Put plenty of PVC pipe cement on both the OD of the pipe, and ID of the couplers. Start with the supply side pipe. Put the first coupler there, then the next length of pipe into that, then the next part, either another coupler if you are extending the length, or, the piece that you have screwed into the unit. Now that that is set, make sure that you have aimed the unit right at where the other PVC supplied line is, and start from the unit with a coupler, Pipe, and connecting coupler. Be sure that you give all of these joints a slight twist as you are seating them. This will make sure that there are no incomplete applications of glue. Also, you will do better if you do a trial fit of all of the patch fittings before you do any gluing. Good Luck.
landscaper coming next thursday 11/5 ?
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