Pressure Relief Valves | Safety Valve | RS
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    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.

    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.

    Pressure Relief Valves and Pressure Safety Valves

    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.

    Applications

    • Water Heaters: PRVs are commonly installed on water heaters to protect against excessive pressure build-up caused by thermal expansion.
    • Plumbing Fixtures: Pressure relief valves can be used in plumbing fixtures, such as faucets and showerheads, to maintain a safe and consistent water pressure.
    • Backflow Prevention: PRVs are employed in backflow prevention devices to protect the potable water supply from contamination. These valves prevent the reverse flow of water, which can occur due to a drop in supply pressure or backflow from a connected system.
    • Water Pressure Regulators: PRVs are integral components of water pressure regulators. These devices are installed where the incoming water supply pressure is too high and needs to be reduced to a safe and manageable level for the plumbing system.
    • Hydronic Heating Systems: In hydronic heating systems, which use hot water or steam to distribute heat, PRVs are employed to protect against overpressure situations.

    55 Products showing for Pressure Relief Valves

    RS PRO
    22 mm
    0.5bar
    +120°C
    Hot Water
    -
    -
    -
    -
    -
    Compression
    RS PRO
    22 mm
    0.5bar
    +120°C
    Hot Water
    -
    -
    -
    -
    -
    Compression
    Altecnic
    1/2 in G Female
    6bar
    +110°C
    Hot Water
    G 1/2
    -
    Brass
    Female
    1/2in
    G
    Altecnic
    1/2 in G Female
    3bar
    +110°C
    Hot Water
    G 1/2
    -
    Brass
    Female
    1/2in
    G
    Reliance Water Controls
    1/2 in BSP Female
    3bar
    +140°C
    Hot Water
    BSP 1/2
    -
    Brass
    Female
    1/2in
    BSP
    Nabic Valve Safety Products
    1 in BSP Female
    5bar
    +195°C
    Air, Hot Water, Steam
    BSP 1
    Yes
    Bronze
    Female
    1in
    BSP
    Amphenol Industrial
    20 mm
    -
    +150°C
    Air
    -
    -
    -
    Male
    -
    Metric
    Siemens
    1/4 in G
    -
    +110°C
    Combined With Variable Speed Pumps, Hvac Systems
    -
    -
    -
    Female
    -
    G
    Amphenol Industrial
    M12
    7psi
    +125°C
    Industrial Connectors
    -
    -
    -
    -
    -
    Push Fit
    Reliance Water Controls
    1/2 in BSP Male
    7bar
    +95°C
    Hot Water
    -
    -
    -
    Male
    1/4in
    BSP
    Watts
    -
    7bar
    -
    -
    -
    -
    -
    -
    3/4in
    -
    Reliance Water Controls
    1/2 in BSP Male
    10bar
    +95°C
    Hot Water
    -
    -
    -
    Male
    1/4in
    BSP
    SMC
    G 1/4
    10bar
    +60°C
    Air
    1/8mm
    -
    -
    Female
    -
    G
    Amphenol Industrial
    M12
    7psi
    +125°C
    Industrial Connectors
    -
    -
    -
    -
    -
    Metric
    Siemens
    1/4 in G
    -
    +120°C
    Heating, Ventilation And Air Conditioning Systems
    -
    -
    -
    Female
    -
    G
    SMC
    G 1/2
    10bar
    +60°C
    Air
    3/8mm
    -
    -
    Female
    -
    G
    Amphenol Industrial
    20 mm
    -
    +150°C
    Air
    -
    -
    -
    Male
    -
    Metric
    Amphenol Industrial
    40 mm
    -
    +150°C
    Air
    -
    -
    -
    Male
    -
    Metric
    SMC
    3/4 in G
    1bar
    +60°C
    Air
    1/2mm
    -
    -
    Female
    -
    G
    Amphenol Industrial
    -
    7psi
    +125°C
    Industrial Connectors
    -
    -
    -
    -
    -
    Push Fit
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