The ever growing necessity of preventive measure have led to the emergence of a number of types of backflow preventers. 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 vital for one to understand that before opting to purchase any of these preventers, he will need to take into consideration a good number of factors to help you out. 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 is the pressure vacuum breaker that is actually relatively less costly. The fact that it does not have a complex design has made it quite a popular backflow preventer. The costs that are attached to their repair and maintenance is pretty much low. The installation of these preventers is done with adorable ease. These preventers are usually installed vertically with the inlet being at the bottom. It is recommended that this lies at a distance of about twelve inches from the uppermost point of the downstream point. Remember, it is not advisable to install them at points where back pressure is inevitable. They are purposed to prevent back-siphoning and not back-pressure.
Then comes the double check valves. In the event of a need to install the preventers underground or indoors, then these are the best for the job. 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. It is necessary for the installation to be done horizontally. Such preventers will be great when you install them in areas where there is back-siphoning or even back-pressure. This is so because they are stable enough to counter these kind of effects.
Then, we have the pressure zone assembly. Apart from it being complex, it actually comes at a quite a pricy cost. Despite that, these are the most reliable and secure preventers known. For as long as it is horizontal, it can either be installed underground or above the ground. They will always stand out in preventing back-siphoning and back pressure. Lastly, we have the atmospheric vacuum breaker. This is the least expensive among all. It is almost similar with the pressure vacuum breaker in terms of its characteristics. You however need to note that this preventer cannot withstand continuous pressure that may last for over twelve hours. It is not so stable in handling immense back pressure.