Double Check Valve Backflow Preventer

Of all the types of backflow preventer, how do you know which one is right for you? Being one of the most common types of backflow preventer, the double check valve backflow preventer might be chosen right away simply because you think many people use it because it is effective. However, like all things, there are boundaries to which they can serve their purpose successfully. Even the best of its kind would still be unable to perform some functions because of the limitations of the design. If you want to know whether the double check valve backflow preventer is the one you should get, read on and find out.

double check valve backflow preventer

The Double Check Valve Backflow Preventer

This is a compact backflow preventer, consisting of two check valves that work independently in a series. It provides twice the protection a check valve gives, by reducing the amount of pressure differential the moment water passes through one valve. Moreover, it operates even if one of the check valves is malfunctioning or is broken. The functionality of this backflow preventer can be measured through test cocks which are then attached to the test equipment.

Double Check Valve Backflow Preventer Installation Requirements

If you decide that DC is what you need, you must comply with the set guidelines in installing your device.

  1. The device must have a cover so that it would be protected from freezing
  2. Owner must submit permit to install the device.
  3. The installer of the DC must be licensed.
  4. The Double Check Valve must be installed before the irrigation system and after the water meter.
  5. The box containing the DC must have adequate space for testing purposes.
  6. Consulting an inspector is recommended if you’re not sure whether to install the Double Check Valve below grade or above grade.

What are the Advantages and Disadvantages of Using the Double Check Valve Backflow Preventer?

One great advantage of implementing the utilization of DC in your design is that it provides great protection against a certain level of hazardous substances present in your water supply. Moreover, the design allows functionality even when there is a problem with one part of the device. If everything is operating perfectly, it divides the pressure that has to be dealt with. It is intended to have a back-up plan so that you are not exposed to contaminants easily.

There is a catch to this, however. A great disadvantage is debris can cause the valves not to close completely. Much worse, in the event that this happens, there is no remedy to it. Another disadvantage is that there is no way of knowing your backflow preventer double check valve assembly is failing unless a qualified professional performs a test.

Depending on the use of double check valve backflow preventer to you and on how secure you want your water supply to be, the disadvantages may be a deal breaker. Keep in mind that there is no punishment for installing a device providing a higher level of protection.