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 explosion or fire risk.

PRV or PSV?

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

Pressure relief valves are found in a variety of work environments and equipment types, and are integral to workplace safety. RS Components supplies quality pressure relief valves from leading brands, to support your application.

Hot Water Systems

As water can expand at 3% of its volume, depending on how much it is heated from room temperature, pressure relief valves are common in hot water systems and boilers, both in domestic and commercial installations. To ensure your hot water flow is smooth and uninterrupted, PRVs are needed to relieve unnecessary pressure in central heating systems.

Gas Systems

Pressure regulation is vital wherever gas powered tools and equipment are used. Overpressure is a potentially catastrophic risk when gas cylinders are employed, so you will find some kind of pressure relief valve wherever gas powered systems are installed, from factory floors to beer cellars.

...
Read more Read less

Filters

Viewing 21 - 29 of 29 products
Results per page
Description Price Connection Maximum Set Pressure Maximum Temperature For Use With Exhaust Port Size Lockable Body Material Connection Gender Thread Size Thread Standard or Connection Type
RS Stock No. 799-8853
Mfr. Part No.482853
SGD330.58
Each
units
1/2 in BSP 2.5bar +350°C Steam BSP 3/4 - Stainless Steel - 1/2in BSP
RS Stock No. 799-8862
Mfr. Part No.482857
SGD360.46
Each
units
3/4 in BSP 3bar +350°C Steam BSP 1 - Stainless Steel - 3/4in BSP
RS Stock No. 794-8423
Mfr. Part No.PTEM550753
SGD91.42
Each
units
1/2 in BSP Male 10bar +95°C Hot Water - - - Male 1/4in BSP
RS Stock No. 794-8448
Mfr. Part No.PTEM550951
SGD112.68
Each
units
1/2 in BSP Male 7bar +95°C Hot Water - - - Male 1/4in BSP
RS Stock No. 178-0052
Mfr. Part No.2252571
BrandWatts
SGD45.47
Each
units
- - - - - - - - - -
RS Stock No. 799-8866
Mfr. Part No.482858
SGD372.67
Each
units
3/4 in BSP 4bar +350°C Steam BSP 1 - Stainless Steel - 3/4in BSP
RS Stock No. 178-0050
Mfr. Part No.2252550
BrandWatts
SGD17.11
Each
units
- - - - - - - - - -
RS Stock No. 178-0051
Mfr. Part No.2252570
BrandWatts
SGD29.60
Each
units
- - - - - - - - - -
RS Stock No. 799-8878
Mfr. Part No.482860
SGD372.67
Each
units
1 in BSP 3bar +350°C Steam BSP 1 - Stainless Steel - 1in BSP
Related Products
316L stainless steel construction, fully machined from quality ...
Description:
316L stainless steel construction, fully machined from quality forgingsEPDM sealsCreep resistant bearingsReinforced nylon handleReduced risk of contamination by top and bottom sealsOperating temperature -10ºC to +120°CWorking pressure 0.9 bar to 10 barPolished disc.
The Floguard range of double check valves is ...
Description:
The Floguard range of double check valves is used for the prevention of back-flow and back-syphonage contamination risks in accordance with the water supply (water fittings) Regulations 1999.Manufactured from DZR brass the WRAS approved Floguard range is supplied unplated with ...
A range of bronze globe valves, individually hydrostatically ...
Description:
A range of bronze globe valves, individually hydrostatically tested to BS 5154 at the following test pressures: Shell: 48 bar, Seat: 35.2 barRising StemThreaded bonnetRenewable disc which is suitable for steam serviceBronze trim with glass filled PTFE diskBS21 Taper thread ...
Female screwed type bronze globe valves. These inline ...
Description:
Female screwed type bronze globe valves. These inline stop valves can be used in many applications including steam, water, oil and air. • Rising stem• PTFE renewable disk• High-quality PTFE packing• Body design conditions: PN32• 198°C at 14 bar, 100°C ...