The backflow preventer assembly is an essential part of maintaining a barrier between a non-potable water source and a portable water source. Drinking water distribution systems are designed with the intention of the water flowing in one direction, from the distribution center to the many various points of use. Unfortunately, hydraulic conditions can and do exist that may deviate from the “normal” conditions, causing water to flow in the opposite direction. This undesirable reversal of flow is called backflow and can draw outside contamination back into the main water lines. The back flow preventer assembly prevents contaminated or polluted water from entering a drinkable water source by prevent backsiphonage and backpressure. We are dedicated to simplifying all your backflow prevention needs including testing, certification, surveys, retro fitting, repair, and maintenance. We will repair your assembly, restoring it to proper working order as quickly as possible. When you work with us, you can expect minimal downtime and exceptional service.
Double Check Valves
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It consists of two check valves assembled in series. This employs two operating principles: firstly one check valve will still act, even if the other is jammed wide open. Secondly the closure of one valve reduces the pressure differential across the other, allowing a more reliable seal and avoiding even minor leakage. Most systems have check valves with ball valves at the ends, for isolation and testing. The double check valve assembly is suitable for prevention of back pressure and back siphonage, but is not suitable for high hazard applications. It is commonly used on lawn irrigation, fire sprinkler and combi-boiler systems. If the hazard is higher, even a relatively low hazard such as using antifreeze in the fire sprinkler system, then a more reliable check valve such as a reduced pressure device may be required.
Reduced Pressure Valve
A Reduced Pressure Zone (RPZ) Valve is considered suitable for significant hazard applications, that is, where the consequence of backflow into the water supply would cause significant harm, although not for the highest risks, such as human waste. They are considered suitable because they prevent both back pressure and back-siphonage, because of a redundant design. Even with two check valves broken the device still provides protectio and are testable to verify correct operation. The device consists of two independent check valves, plumbed in series, with a pressure monitored chamber between. The chamber is maintained at a pressure that is lower than the water supply pressure, but high enough to be useful downstream. The reduced pressure is guaranteed by a differential pressure relief valve, which automatically relieves excess pressure in the chamber by discharging to a drain. Four test cocks are installed to allow our inspectors to annually test and verify proper operation of the valve with a differential pressure meter.
Pressure Vacuum breakers and Spill-resistant Vacuum Breakers
A pressure vacuum breaker (PVB) is a type of backflow prevention device, used to keep non-potable (or contaminated) water from entering the water supply. A PVB is similar to an atmospheric vacuum breaker (AVB), except that the PVB contains a spring-loaded poppet. This makes it acceptable for applications that are high hazard or where valves are downstream.
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