Many irrigation systems, not all, have a pressure vacuum breaker, otherwise known as a PVB, as a backflow prevention device. It is a device that prevents backflow or back siphonage of water in the irrigation system to flow backwards into your potable (drinking) water. It’s mandatory to have a backflow device on an automatic sprinkler system. Backflow devices prevent cross contamination of your drinking water.
There are several types of backflow devices installed in irrigations systems to prevent reverse flow. These include a reduced pressure zone device (RPZ), double check valve (DCV), and a pressure vacuum breaker (PVB). The device used in your irrigation system is dependent on your location, town code, and water district. Residents in the Town of Oyster Bay and Jericho Water district, then you would be required to have a double check valve. If you live in the Town of Huntington, then a pressure vacuum breaker is required.
If you have a PVB, then it is very important to have your system winterized before the temperatures drop below freezing. The PVB is located on the outside of your home, near the foundation, and in line with the sprinkler supply pipe as it exits the home. It is exposed to the elements and susceptible to freezing and cracking. 
Below freezing temperatures can cause the water in the PVB to freeze and crack the device. Because the weather is unpredictable and below freezing temperatures can occur at any time. I recommend covering with a heavy towel or blanket to insulate and keep air and wind from direct contact. You can also purchase a cover that will fit the device and protect it. Replacing and or repairing a PVB is expensive and preventable.
The best protection would be to call RAIN RICH at 631-423-2211 and schedule your winterizing before cold weather arrives. Covering the device during the fall is recommended. You can also contact us by email: mnava@rainrich.com or by clicking here. To learn more then please visit www.rainrich.com. We look forward to servicing you and your irrigation system!
