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We recommend the Diaphragm type instruments Model 845-5 and 835 with bottom and vent connection.  Use for testing system differential pressure and checking assemblies used for back flow prevention. Backflow Test kits are also available in 2 and 3 valve models.

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A Pressure Relief Valve regulates pressure to prevent damage to pipes, the boiler, and the entire central heating system. The PRV is connected to a discharge pipe that directs the expelled water safely away.

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Our heating leak experts are able to detect leaks on central heating systems using non-destructive techniques including Thermal Imaging, Acoustic Listening Devices and Tracer Gases.

Backflow prevention device

A backflow preventer is a critical component of plumbing systems’ backflow prevention that helps ensure the safe and clean flow of water by preventing contaminants or pollutants from flowing back into the main water supply. Backflow can occur when there is a drop in water pressure in the main supply line, causing water to flow in the opposite direction it is intended to flow. This can happen due to a variety of reasons. Two examples are a broken water main or a fire that uses up a large amount of water.

To prevent backflow, you’ll want to make sure you install a backflow preventer valve. These valves are designed to close automatically when water pressure drops, preventing water from flowing in the opposite direction. Backflow preventer valves should be tested annually by a certified professional to ensure they are functioning properly. This typically involves checking the valve for proper operation, checking the pressure gauge, and checking for leaks or other signs of damage. In addition, the valve should be cleaned and lubricated as needed to ensure proper operation.

If you notice that the PRV leaks water, especially during water heating, it likely indicates that your expansion vessel is faulty or requires repressurization.

Pressure Relief Valves (PRVs) are crucial components in maintaining the safety and efficiency of a central heating system. PRV’s are designed to release water and reduce pressure, thus preventing potential damage.

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Corrosion, material degradation, or high pressure can lead to a malfunctioning PRV, often indicated by leaking water or a hiss sound.

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A properly functioning expansion vessel accommodates water influx as pressure rises and releases it as the temperature, and consequently the pressure, drops.

You may have a central heating leak if your Pressure Relief Valve is not leaking. A slow leak in your heating system could be the cause of your boiler losing pressure.