The emergence of backflow preventers has been caused by the ever growing need of their use,. Many times have seen to it that they get to be installed in the water system at a position just before the isolation valve. There are four types of preventers that are really helpful if you install them. It is however important that you fully understand that before selecting any backflow device, you will have to take into account various factors in a bid to make sure you pick the best. Some of these factors will be discussed alongside the type of preventers that you may opt to consider. The best of types are as illustrated below.
There exists a pressure vacuum breaker that is appreciated because of its cost effectiveness. It is a really popular backflow preventer given that is relatively not complex in its design. The repair and maintenance of this preventer is often inexpensive. You should also note that these preventers are truly easy to install. With the bottom being at the bottom, the preventer is installed vertically. This is done at least twelve inches above the uppermost downstream point. You ought to understand that it is not recommended that you have these preventers installed at points where back-pressure is likely to occur. They are good at handling back-siphoning and not back-pressure.
Then comes the double check valves. These are usually the most recommended for underground and indoor installations. They will often need to be purchased in preassembled states. This is both convenient and inexpensive. There is a possibility of having these preventers installed inline or underground. There is a need to have these preventers to be installed horizontally. Such preventers will be great when you install them in areas where there is back-siphoning or even back-pressure. This is due to their level of stability to counter both the two effects.
Then, we have the pressure zone assembly. It is relatively expensive and complex too. Regardless, they stand as the most reliable and secure preventers. For as long as it is horizontal, it can either be installed underground or above the ground. These preventers are the best in terms of preventing back-pressure as well as back-siphoning. In conclusion we look at the atmospheric vacuum breaker. This is the least expensive among all. It has similar traits with the pressure vacuum breaker. You however need to note that this preventer cannot withstand continuous pressure that may last for over twelve hours. It should not be allowed in case there is a probability of back pressure.