The emergence of backflow preventers has been caused by the ever growing need of their use,. In most cases, they are installed in the water system 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. As we explore the types of preventers that you may find suitable for your needs, a couple of crucial factors will be mentioned too. The most common types are as mentioned below.
There exists a pressure vacuum breaker that is appreciated because of its cost effectiveness. Given that its design is relatively simple, it has been widely appreciated. The costs that are attached to their repair and maintenance is pretty much low. The process of installation of these preventers is really easy. They are usually installed vertically but the inlet has to be at the bottom. This is done at a height that is at least twelve inches from the peak of the 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 purposed to prevent back-siphoning and not back-pressure.
Then there are 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. It is necessary for the installation to be done horizontally. These preventers will offer you great service whether you want to counter back-pressure or back-siphoning. This is due to the fact that they have the ability to withstand such effects.
The reduced pressure zone assembly comes in next. It has been noted as complex and relative costly too. Regardless, they stand as the most reliable and secure preventers. They can either be installed underground or even above the ground in a horizontal way. They will always stand out in preventing back-siphoning and back pressure. Lastly, we have the atmospheric vacuum breaker. Of all the preventers, this is the only one that comes with the least cost. Its characteristics bear similarity with the pressure vacuum breaker. You will however, find it necessary to observe that the pressure that goes through this preventer does not go beyond twelve continuous hours. It is not so stable in handling immense back pressure.