What Is A PVB? Should It Be Performed When Needing A Sprinkler Repair. We Feel It Is Very Important.




Is a PVB (pressure vacuum breaker) also known as backflow preventer needed? Irrigation repair Phoenix can help you with this task.

Your landscape has got all kinds of terrible things within it that will make you sick or more serious if you swallow them. Thus irrigation water is believed to be a contaminant (creates a health hazard) and not just just a pollutant (is objectionable in color or odor). What's in your sprinkler systems water? How about toxic chemicals (fertilizers, pesticides, and so on.) and animal waste? (Not that I wanted to gross you out, nonetheless day after day millions of dogs elevate their legs in a fond salute to their much loved sprinkler head!) These things can and WILL come back up your irrigation pipes and even into your water if you don't stop them. For those who have a well they could go down your well and into everyone else's drinking water. For anyone who is on a community water system they could possibly go back up into the pipes and poison your community. The valves that turn on and off your irrigation system are not good enough to stop backflow. The purpose of the backflow preventer is used to protect you in case the valve breaks or leaks, which all valves will do sooner or later. Saving a little bit of money by leaving out the backflow preventer may not seem so intelligent after you pay a small fortune on hospital bills (or funeral fees) for a poisoned member of the family or pet!

Now wait a minute, some people say, doesn't the water pressure in the system hold the irrigation water from running backwards? Yes, generally it does. On the other hand there are times when the water pressure reduces in the supply system, and this is when the backflow will occur. No, it is not a frequent occurrence. Nonetheless it does take place more often than you think, such as when they need to shut off the water to fix a primary line or a valve. Which makes construction projects easily the most frequent cause of backflow troubles. Fire fighting is another common the reason for backflow. Fire vehicles use huge pumps to suck the water out of the fire hydrants. This frequently causes the water pressure in the water system to decrease, and backflow might occur in the surrounding neighborhoods. You can perform a quick experiment on your own and create backflow. Just simply turn off the water valve leading to your house. Now have someone turn on a faucet. Now switch on a different faucet that is higher than the first. You should hear air being sucked into the higher faucet. You just created backflow in your own home piping. Fairly easy, wasn't it?

Another common dispute against the need for backflow preventers is that if all the valves are closed off the water can't run backwards through them. So the valves will prevent backflow. The very clear problem with this is that if the backflow happens at a time when the valve is open, the valve will not stop backflow! But even when the valve is shut it may not stop backflow. A standard manually ran valve will stop backflow any time it is closed- as long as the valve if fully closed, has good seals, and does not leak. On the other hand most of the automatic valves, for example the electric solenoid valves used for irrigation systems, will not stop backflow even though fully closed. That is because these valves are directional in design, if you happen to look on the valve you see that there is an arrow on it featuring the flow direction. If the flow is reversed, the valve can not completely close and will leak (that's why the valve has the arrow on it to caution you not to install it backwards.) Thus when backflow takes place and the flow direction reverses, an automatic valve will not stop the backward flow.

Therefore when choosing a company to complete sprinkler repair or sprinkler installation be certain to have them install a PVB for you!

All Valley Landscaping is familiar with sprinkler systems and can fix any sprinkler repair you could have. Call us today for your free estimate. We guarantee to beat any licensed contractors written bid. We can do sprinkler repair Scottsdale or any where in the city.

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