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Pressure Relief Valves

Pressure relief valves are used to protect plumbing and heating systems from damage caused by harmful high pressure situtaions.

Pressure is measured in "Bar". One Bar is about equal to the atmospheric pressure on Earth at sea level. In "old money" it's equal to 14.5 pounds per square inch (PSI).

3 Bar = 43.5 PSI (The normal size used for a relief valve in a central heating system)

6 Bar = 87 PSI (Common size for unvented water heaters)

7 Bar = 101 PSI

The outlet from a pressure relief valve should be positioned in a way so as to not scald people or animals with escaping hot water or steam.

Pressure Relief Safety Valve 3 Bar 1/2" BSP Female x Female
3 bar 1/2 inch BSP female x female pressure relief safety valve.
Used to protect central heating system boilers and radiators.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£6.26
Pressure Relief Safety Valve 3 Bar 1/2" BSP Female x Female
3 bar 1/2 inch BSP female x female pressure relief safety valve.
Used to protect central heating system boilers and radiators.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£6.26
Pressure Relief Safety Valve 3 Bar 1/2" BSP Male x Female
3 bar 1/2 inch BSP male x female pressure relief safety valve.
Used to protect central heating system boilers and radiators.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£7.59
Pressure Relief Safety Valve 3 Bar 1/2" BSP Male x Female
3 bar 1/2 inch BSP male x female pressure relief safety valve.
Used to protect central heating system boilers and radiators.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£7.59
Pressure Relief Safety Valve 3 Bar 3/4" BSP Female x Female
3 bar 3/4 inch BSP female x female pressure relief safety valve.
Used to protect central heating system boilers and radiators.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£7.99
Pressure Relief Safety Valve 3 Bar 3/4" BSP Female x Female
3 bar 3/4 inch BSP female x female pressure relief safety valve.
Used to protect central heating system boilers and radiators.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£7.99
Pressure Relief Safety Valve 6 Bar 1/2" BSP Female x Female
6 bar 1/2 inch BSP female x female pressure relief safety valve.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£7.16
Pressure Relief Safety Valve 6 Bar 1/2" BSP Female x Female
6 bar 1/2 inch BSP female x female pressure relief safety valve.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£7.16
Pressure Relief Safety Valve 7 Bar 1/2" BSP Female x Female
7 bar 1/2 inch BSP female x female pressure relief safety valve.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£7.99
Pressure Relief Safety Valve 7 Bar 1/2" BSP Female x Female
7 bar 1/2 inch BSP female x female pressure relief safety valve.
Colour of plastic top may vary from picture (makes no difference to operation of valve).
£7.99
Pressure Relief Safety Valve Adjustable Spring Type 1/2" BSP
Brass 1/2 inch BSP pressure relief valve.
This safety valve has a simple (adjustable) spring loaded mechanism with a lock ring to lock the adjuster in position.
£2.94
Pressure Relief Safety Valve Adjustable Spring Type 1/2" BSP
Brass 1/2 inch BSP pressure relief valve.
This safety valve has a simple (adjustable) spring loaded mechanism with a lock ring to lock the adjuster in position.
£2.94
Pressure Gauge 1/4" BSP Back Connection 4 Bar
1/4 inch BSP 4 bar back entry water pressure gauge with red reference pointer and scale in bars.
£10.98
Pressure Gauge 1/4" BSP Back Connection 4 Bar
1/4 inch BSP 4 bar back entry water pressure gauge with red reference pointer and scale in bars.
£10.98
Pressure Gauge 1/4" BSP Bottom Connection 4 Bar
4 bar bottom connection water pressure gauge with red reference pointer and scale in bars.
£10.95
Pressure Gauge 1/4" BSP Bottom Connection 4 Bar
4 bar bottom connection water pressure gauge with red reference pointer and scale in bars.
£10.95
Automatic Differential Bypass Valve 22mm
22mm differential bypass valve.
Fitted near the boiler, an automatic bypass valve is used to maintain a minimum flow rate through the boiler and to limit circulation pressure when other valves / water paths are closed.
£11.82
Automatic Differential Bypass Valve 22mm
22mm differential bypass valve.
Fitted near the boiler, an automatic bypass valve is used to maintain a minimum flow rate through the boiler and to limit circulation pressure when other valves / water paths are closed.
£11.82
Pressure Reducing Valve With Gauge
Pressure reducing valve complete with gauge.
15mm / 22mm connections.
WRAS approved.
Maximum inlet pressure 16 bar.
Adjustable outlet pressure 1-6 bar (factory preset to 3 bar).
£24.91
Pressure Reducing Valve With Gauge
Pressure reducing valve complete with gauge.
15mm / 22mm connections.
WRAS approved.
Maximum inlet pressure 16 bar.
Adjustable outlet pressure 1-6 bar (factory preset to 3 bar).
£24.91