Reduced pressure backflow preventervs Double check valve

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The RP may be used at actual or potential high- or lowhazard applications. As previously mentioned, the assembly provides backpressure and backsiphonage protection.

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According to Queensland legislation, hot water is to be heated to a minimum of 60°C to prevent the growth of bacteria such as Legionella. A tempering valve ensures that hot water flows from taps at a maximum temperature of 50°C.

Tempering valves and TMVs are the devices responsible for ensuring that the water that comes out of your tap is safe and at the right temperature. But, what is the difference?

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Thermostatic mixing valves are required by law in the following locations, due to the possibility of high risk people being present (such as the elderly, sick or children):

As water flows through the first check valve, a pressure drop is created. The assembly's relief valve determines if the supply pressure is greater and will remain closed; if the difference in pressure between the supply and zone is reduced, the relief valve will open. With a loss of supply pressure and both checks closing, the relief valve will open to maintain a minimum pressure of two psi less than the supply pressure of the fluid in the zone and downstream line. If there is a complete loss of supply pressure, the pressure between the two check valves will become atmospheric because the spring has opened the relief valve.

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The mixing valve is a sliding component that is found in the tempering valve, ensuring the correct ratio of hot to cold water is being allowed to flow through. A tempering valve usually controls the temperature within ±3%.

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Reduced Pressure Backflow PreventerTest Procedure

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Although TMVs and tempering valves get regularly mixed up, they are actually two separate devices. They both mix hot and cold water together to achieve a specific water temperature, but there are a few notable differences:

A TMV mixes both hot and cold water together so it is a particular temperature (within 1℃ +/-) so it can be sent to different water outlets. The temperature is generally prearranged by a tradesperson or a qualified plumber, and the TMV element that responds to thermal activity alters the levels of hot and/or cold water to ensure the correct temperature.

Reduced Pressure backflow preventerinstallation

A field test of an RP is required on installation, at least annually thereafter, after any repair or when relocated. The assembly must be installed a minimum of 12 inches above the surrounding ground or floor.

When you turn your hot water tap on, you expect hot water to flow out. Whether it is a shower, bath, kitchen sink or laundry basin, water at a particular temperature will always run from the faucets in your home or workplaces. But how does that occur?

603.3.7 Reduced-Pressure Principle Backflow Prevention Assembly (RP). A reduced-pressure principle backflow prevention assembly consists of two independently acting internally loaded check valves, a differential pressure-relief valve, four properly located test cocks, and two isolation valves.

The name of this assembly is derived from a zone of reduced pressure needed for the operation of the relief or vent valve. This device is an assembly of two internally loaded, specially designed and independently operating check valves that have a relief valve installed between the primary valves, specifically designed to maintain a zone of relative differential pressure between the two check valves unless one or both of the check valves are fouled. This assembly has a tightly closing upstream and a tightly closing downstream shutoff valve (see Figure 603.3.7).

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According to National Plumbing and Drainage Standard AS/NZS 3500.4: 2003, some water installations are not permitted to deliver water at a temperature higher than 50℃/45℃, which is why a TMV is installed – to assist with temperature regulation.

A tempering valve has a temperature sensitive element which focuses on adjusting the mix of hot/cold water depending on two factors:

A tempering valve, which is also known as a hot water mixing valve or a hot water tempering valve, is either a 2-inlet or 3-inlet mixing valve which is adjustable and activated by temperature. It mixes both hot and cold water together to achieve a desired temperature, in order to regulate the temperature of hot water that flows from outlets in your home.

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An RP's relief valve has the potential to discharge a significant amount of water. Care should be taken as to its location and provision for indirect drainage. The drainage piping should be sized adequately to take the full discharge of the system. Always refer to the manufacturer's installation requirements.

A thermostatic mixing valve, which is also known as a TMV, is a tool that combines hot and cold water together to maintain a specific water temperature when sending water through a faucet.

The reduced pressure principle backflow prevention assembly is referred to as the RP, RPPZ, RPZ as well as other acronyms. The RP is the best mechanical backflow preventer available today. It is considered as proper protection for high- or low-hazard applications, backpressure or backsiphonage backflow and containment or isolation protection.