Safety Relief Valves for Heating & Water Systems
We offer a large range of safety valves for the pressure protection of water, hot water, boiler and heating system. We can also offer combined temperature and pressure relieve valve and valves with WRAS approval.
Free pressure setting, testing and certification.
All safety relief valves supplied by Johnson Valves are set to your pressure requirements and issued with a certificate to the relevant standards at no extra cost.
707 – Bailey Birkett High Lift Safety Relief Valve
The 707 range of safety relief valves offer protection against over pressure on boilers, compressors, pressure vessels, process pipelines and pressurised equipment. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
Standard Capacity • High Lift • Side Discharge • Lever or Dome Top
Size & Connections
15mm (1/2″) to 50mm (2″) • BSP/NPT FxF or MxF • Flanged PN25, ANSI 150, BS10 H*
Duty
Air • Inert Gases • Oil • Process Liquids • Steam • Water (dependent on trim)
Materials
Bronze Body • Aflas, EPDM or Stainless Steel Disc
Set Pressure Range
0.35 to 24 bar
Temperature
Aflas Disc: -20°C to 200°C • EPDM Disc: -20°C to 95°C • SS Disc: -20°C to 224°C
Compliance & Approvals
BS6759 Part 1, 2 & 3 (dependent on duty) • BSEN ISO 4126 Part 1 • WRAS (EPDM disc)
* Flanged inlet x Screwed outlet only, specify when enquiring
542 – Nabic Safety Relief Valve
The Nabic 542 safety valve is an extremely versatile valve, suitable for use on hot water, steam or air. Although designed primarily for protection of hot water boilers, it’s wide range of applications make it an ideal general purpose safety valve. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
Standard Capacity • Side Discharge • Lifting Lever
Size & Connections
15mm (1/2″) to 80mm (3″) BSP Female
Duty
Air • Oil • Inert Gasses • Steam • Water
Materials
Bronze Body • PTFE Seat Seal (Viton option)
Set Pressure Range
0.55 to 10.5 bar (dependent on size)
Temperature
-20°C to 195°C
Compliance & Approvals
BS6759 • BSEN ISO 4126 • WRAS (1 bar and above)
716 – Bailey Birkett High Capacity Full Lift Safety Relief Valve
The 716 range of safety relief valves offer protection against over pressure on boilers, compressors, pressure vessels, process pipelines and pressurised equipment. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
High Capacity • Full Lift • Side Discharge • Lever or Dome Top
Size & Connections
15mm (1/2″) to 50mm (2″) • BSP/NPT • Flanged PN16/25, ANSI 150, BS10 E/F/H*
Duty
Air • Inert Gases • Oil • Process Liquids • Steam • Water (dependent on trim)
Materials
Bronze Body • Aflas, EPDM or Stainless Steel Disc
Set Pressure Range
0.35 to 32 bar (dependent on size & duty)
Temperature
Aflas Disc: -29°C to 200°C • EPDM Disc: -29°C to 150°C • SS Disc: -29°C to 220°C
Compliance & Approvals
BS6759 Part 1, 2 & 3 (dependent on duty) • BSEN ISO 4126 Part 1
* Flanged inlet x Screwed outlet only, specify when enquiring
500 – Nabic High Capacity, High Lift Safety Relief Valve
The Nabic 500 safety valve is an extremely versatile valve, suitable for use on hot water, steam or air. Although designed primarily or use on un-vented hot water heating systems, where a high capacity, emergency steam relief capability is required, it is also an ideal general purpose safety valve. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
High Capacity • Full Lift • Side Discharge • Lifting Lever
Size & Connections
15mm (1/2″) to 65mm (2 1/2″) BSP Female
Duty
Air • Oil • Inert Gasses • Steam • Water
Materials
Bronze Body • PTFE Seat Seal (Viton option)
Set Pressure Range
0.69 to 12.5 bar (dependent on size)
Temperature
-20°C to 195°C
Compliance & Approvals
BS6759 • BSEN ISO 4126 • WRAS (1 bar and above)
652D – Goetze Side Discharge Bronze Diaphragm Safety Relief Valve
The 652D is fitted with a diaphragm to prevent the media from entering the spring chamber thus making it suitable for the protection of pumps, closed cooling circuits and pressure tanks and systems for water and neutral liquids. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
Side Discharge • Twist Lifting Mechanism
Size & Connections
15mm (1/2″) to 50mm (2″) BSP
Duty
Water • Neutral Liquids
Materials
Bronze Body • EPDM Disc (NBR option for oil duty)
Set Pressure Range
1 to 16 bar
Temperature
EPDM Disc : -50°C to 150°C • NBR Disc : -30°C to 130°C
Compliance & Approvals
BS6759 • TÜV Test Approval 293 • BSEN ISO 4126
716T – Bailey Birkett Pressure & Temperature Safety Relief Valve
The 716T protects unvented hot water systems, against both excess pressure and excess temperature. Increasing pressure is sensed by the spring, which automatically opens the relief valve at the pre-set pressure and the integral probe independently monitors increases in temperature, safely opening the relief valve. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
Pressure & Temperature Relief • Side Discharge • Easing Lever
Size & Connections
20mm (3/4″) to 50mm (2″) BSP
Duty
Hot Water
Materials
Bronze Body • DZR Brass Internals • Silicone Trim
Set Pressure Range
2.4 to 10.3 bar
Lift Temperature
Approx. 90°C to 95°C (preset, not adjustable)
Compliance & Approvals
EN14890 • BS6283 • WRAS
500T – Nabic Temperature & Pressure Safety Relief Valve
The 500T pressure & temperature relief valve has been designed for use on unvented hot water supply systems, where protection against excess temperature is required in addition to pressure protection. Pressure and temperature elements of the valve operate independently, thereby providing dual safety protection in the one valve. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
Pressure & Temperature Relief • Side Discharge • Easing Lever
Size & Connections
DN15 (3/4″ BSP) to DN50 (2 1/2″ BSP)
Duty
Hot Water
Materials
Bronze Body • PTFE Seat Seal (Viton option)
Set Pressure Range
0.69 to 12.5 bar (dependent on size)
Lift Temperature
Approx. 90°C to 95°C (preset, not adjustable)
Compliance & Approvals
BS6283 • BSEN ISO 4126 • WRAS (1 bar and above)
683 / 686 / 693 / 696 – Bailey Birkett Single High Lift Cast Steel Safety Relief Valve
The 680 and 690 series of single high lift safety valves combine a top guided design, to provide an unobstructed seat bore, with a floating disc that aligns correctly under all working conditions. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
Single Pot • High Lift • Side Discharge • Lever (686/696) or Dome Top (683/693)
Size & Connections
DN40 to DN100 • Flanged PN16/25/40, ANSI 150/300, BS10 E/F/H*
Duty
Air • Inert Gases • Oil • Process Liquids • Steam • Water
Materials
Cast Steel Body & Bonnet • Stainless Steel Disc
Set Pressure Range
683/686 : 0.25 to 13 bar • 693/696 : 0.25 to 13 bar
Temperature
-20°C to 230°C
Compliance & Approvals
BS6759 Part 1, 2 & 3 (dependent on duty)
* Dependent on series, specify when enquiring
355 – Goetze Cast Iron Safety Relief Valve – Flanged
The Goetze 355 safety relief valve has a cast iron body with various seal options. This valve can be supplied either with open or closed cap. There is also an option with a bellows assembly. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
Side Discharge • Lever or Dome Top • Optional Bellows
Size & Connections
DN15 to DN100 • Flanged PN40 x 16
Duty
Air • Oil • Inert Gasses • Steam • Water
Materials
Cast Iron Body & Spring Housing • St. St. Disc (EPDM, FKM, FFKM & PTFE option)
Set Pressure Range
0.2 to 40 bar
Temperature
Stainless Steel Disc : -10°C to 350°C (see datasheet for other materials)
Compliance & Approvals
TÜV Test Approval 2094 • BSEN ISO 4126-1
723 / 726 / 733 / 736 – Bailey Birkett Double High Lift Cast Steel Safety Relief Valve
The 720 and 730 series of double (twin) high lift safety valves combine a top guided design, to provide an unobstructed seat bore, with a floating disc that aligns correctly under all working conditions. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
Double (Twin) Pot • High Lift • Side Discharge • Lever (726/736) or Dome Top (723/733)
Size & Connections
DN40 to DN100 • Flanged PN16/25/40, ANSI 150/300, BS10 E/F/H*
Duty
Air • Inert Gases • Oil • Process Liquids • Steam • Water
Materials
Cast Steel Body & Bonnet • Stainless Steel Disc
Set Pressure Range
683/686 : 0.25 to 13 bar • 693/696 : 0.25 to 13 bar
Temperature
-20°C to 230°C
Compliance & Approvals
BS6759 Part 1, 2 & 3 (dependent on duty)
* Dependent on series, specify when enquiring
JV131001 – High Capacity Full Lift Ductile Iron Safety Relief Valve
The JV131001 is a economical safety relief valve for the protection of pressure systems and boiler systems. Suitable for use with steam, gases, vapours and liquids within the chemical and processing industries. Supplied set to your requirements with a certificate confirming lift pressure at no additional cost.
Type
High Capacity • Full Lift • Side Discharge • Closed Bonnet • Open Lifting Device
Size & Connections
DN15 to DN250 • Flanged PN40 x 16*
Duty
Air • Inert Gases • Oil • Process Liquids • Steam • Water
Materials
Ductile Iron Body • Stainless Steel Seat & Disc
Set Pressure Range
0.2 to 40 bar (dependent on duty, size & temperature)
Temperature
-10°C to 350°C
Compliance & Approvals
BS6759 • DIN EN ISO 4126-1 • AD2000-A2 • TRD421 • Lloyds • GL • DNV • BV
* DN65 & DN100 – PN16 x PN16 as standard (PN40 x PN16 option)
