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For product-specific approval information, please refer to the product’s specification sheet (see literature section above) or ask a Watts representative. For general information regarding any approval certification partners identified in the specification sheet, please visit our certification partners’ websites:

Pressure relief valves operate in a similar manner to pressure safety valves, and the two terms are sometimes used interchangeably. However, the key difference is that PRVs operate gradually to regulate pressure, while PSVs operate very quickly to counteract sudden pressure spikes. To this end PRVs are more commonly used in liquid systems, and PSVs are more commonly used in gas systems.

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Series SS009 Stainless steel reduced pressure zone assemblies feature a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. Activated through an add-on connection kit, the sensor can trigger the alert system sending notification of flood detection to facility personnel. Connection kits are available for BMS and cellular communication.This series prevents the reverse flow of contaminated water caused by backsiphonage or backpressure from entering the potable water supply. Ideal in industrial or plant applications, in medical/diagnostic equipment, in reverse osmosis systems, and for other health hazard piping systems. Check with local water authorities for installation requirements. To learn more visit: https://www.watts.com/floodprotectionsystem

Series SS009 Stainless steel reduced pressure zone assemblies feature a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. Activated through an add-on connection kit, the sensor can trigger the alert system sending notification of flood detection to facility personnel. Connection kits are available for BMS and cellular communication.This series prevents the reverse flow of contaminated water caused by backsiphonage or backpressure from entering the potable water supply. Ideal in industrial or plant applications, in medical/diagnostic equipment, in reverse osmosis systems, and for other health hazard piping systems. Check with local water authorities for installation requirements.

Once a satisfactory equilibrium has been achieved within the system, the pressure relief valve will then close again until needed. These safety valves are vital components in high pressure systems, as pressure build up can lead to anything from equipment inefficiency and failure to an explosion or fire risk. You can learn more in our guide to pressure relief valves.

Where pressure overload might lead to catastrophic failure in a system, pressure relief valves are essential. The pressure valves, or PRVs, work by opening when a pressure limit has been reached, and diverting either gas, liquid, or liquid-gas mixtures away from the system. How this is achieved depends on the system, but it usually relies on the medium following the path of least resistance offered by the relief valve, and then being disposed of accordingly. Diverted gas might be released into the atmosphere or burned off, and liquids may be diverted into storage or run off.