Backflow Installation Testing

/Backflow Installation Testing
Backflow Installation Testing 2017-05-31T17:20:27+00:00

Backflow Testing & Certification in Cranbury & Throughout Central New Jersey

Need immediate backflow testing and installation in Cranbury or surrounding areas in New Jersey? Call R.A. Nichols Plumbing & Heating at (609) 655-1073 to speak with an experienced service member. Click here for instant savings on your next plumbing service.

Backflow Prevention System

Types of Backflow Prevention Devices

Water should flow only one way through piping systems. Reverse flow, or backflow, can contaminate the system and your water supply. Backflow prevention devices keep contaminants out.

A backflow preventer device uses a check valve that allows water to flow through only one direction. When the supply stops, the valve closes, so water passing from the downstream side cannot go through and contaminate the supply.

Double-check valve backflow preventers involve two separate valves attached to pipes by hinges held open by water pressure during normal flow. When water supply pressure decreases, the hinges close to prevent backflow. However, small particles of dirt or sand may get lodged in the hinges, keeping them open and allowing a small amount of backflow to enter the system.

Reduced-pressure principle backflow preventers maintain a pressure gradient between the supply and downstream lines. A spring-loaded valve closes, while a pressure relief valve opens to introduce air, breaking the vacuum and preventing backflow.

Air gaps prevent backflow by separating the supply line from the downstream line; the air gap between the pipes breaks all pressure between the two. By industry standards, the gap should be never less than an inch.

Installing and Testing Backflow Prevention Devices

After installing your backflow prevention device, you should aim to have it tested annually in accordance with American Water Works Association field test procedures. Installation and testing require the help of licensed plumbers, who are able to provide the care and skill needed for this intricate system.

Double-check valve devices should be installed above-grade if possible, but they may also be installed in below-grade vaults that are properly constructed and well drained. Devices must be installed horizontally and upright. All hot water heating systems should have thermal expansion tanks properly installed and in working condition before the installation of backflow prevention devices.

If you install the device indoors, it should be above the floor and away from the wall to allow clearance for testing and repairs. An air gap should be present between the relief valve outlet and the drain line for drainage piped away.

Mechanical backflow preventers have internal seals, springs, and moving parts subject to fouling, wear, or fatigue; therefore, these devices must be tested periodically for proper function. A visual check of air gaps is sufficient for mechanical backflow preventers.

For other types of backflow prevention devices (double-check valves, reduced-pressure, and pressure vacuum breakers), the check valves, pressure relief valves, and air vents must be tested with equipment properly calibrated to gauge the necessary pressure differentials. Testing should also include an inspection of the pressure relief valves.

Call Central New Jersey’s Leading Backflow Prevention Technicians!

R.A. Nichols Plumbing & Heating is a qualified backflow testing company. We will help you with any necessary permit paperwork, free of charge!

We offer upfront pricing, and our technicians are always up to date on industry trends and advancements. Let us show you why we are your best New Jersey plumber!

Backflow license # – 1045L

Don’t wait to schedule your next backflow preventer test. Call us today at (609) 655-1073 for backflow testing and installation in Cranbury, Princeton, East & West Windsor, Monroe, and Central New Jersey.

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