NABIC 542 Safety Relief Valve

The Reliance Water Controls (RWC) TPR22 Pressure and Temperature Relief Valves are compact devices specifically engineered to safeguard unvented hot water systems against the risks of over-pressurisation. This risk arises when the input temperature or pressure controls fail. The valves are designed to be installed at the upper section of a hot water cylinder, where the highest temperatures are present. If the system temperature exceeds 95°C, the wax mixture within the temperature probe expands, lifting the valve off its seat to release water, thereby alleviating the pressure within the cylinder. Furthermore, should the water pressure rise (without a corresponding temperature increase), the valve remains closed until the preset pressure limit is achieved, at which point it opens to relieve the excess pressure. Certain models are equipped with a PTFE coating on the MBSP inlet thread, streamlining the installation process significantly.

Features and Benefits:

• Protects against temperatures exceeding 95°C
• Prevents over-pressurisation
• Twist top cartridge design for straightforward servicing
• A variety of pressure settings and probe lengths available
• Some models feature a PTFE coating for enhanced installation efficiency

Specification:

• Size: 3/4" x 22mm
• Connections: BSP Male Inlet x Compression Outlet
• Materials: Brass
• Medium: Hot water only
• Set Pressure (Set & Locked): 10 Barg
• Temperature Relief: +90 to 95°C
• Discharge Capacity: 25kW
• Probe Length: 95mm
• Product Code: PTEM575210
• Notes: WRAS approved

Ensure your hot water system remains safe and efficient with the RWC TPR22 Pressure and Temperature Relief Valves.

The FSDCDFA Forward Acting Rupture Discs are composite conventional discs formed by three parts: a slotted, perforated metal part, a seal membrane (usually in PTFE but also available in many other metallic or non-metallic materials) and a protection section. It is excellent for use with gas and liquids in static conditions and excellent for low pressures. FSDCDFA discs react to excessive pressure with total opening in a few milliseconds without fragmentation. They are therefore recommended for valve protection. Supports may be provided for vacuum or counter-pressure protection. Composite FSDCDFA rupture discs may also be used for simultaneous protection from pressure and vacuum. 

Specification

Sizes: 1/2" (DN15) to 40" (DN1000)

Materials: Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium

Rupture Pressure: 0.01 - 110 bar g (depending on material and diameter)

Krl: 

Tolerance: from +/- 5 % to +/- 20%

Temperature: Membrane in PTFE/PFA max 265°C, up to 480°C (depending on the membrane)

Operating Margin: up to 80%

Vacuum Support: Available

Fragmentation: No (membrane only)

Use under valve: Yes

Corrosion Resistance: Good - can be protected with a PTFE membrane

Linings: Yes

Container: FSHI/A, FSHI/P, FSHI/F, FSHTC 

Rupture Sensor: Electrical, Magnetic, Inductive, Optical 

PED Certification (CE Stamp): Available

ATEX EX II 2 GD Certification: Available

The Altecnic / Caleffi 311 Safety Valve - 311560 is specifically designed for use in domestic hot water systems, providing essential protection for hot water cylinders, as well as in heating systems to safeguard boilers and other components. This valve is chosen based on the required set pressure. When system pressure increases and reaches the discharge threshold, the valve opens, releasing excess pressure to the atmosphere. This crucial function prevents the pressure from escalating to dangerous levels within the system, ensuring the safety of the boiler, hot water storage cylinder, and any personnel nearby.

Specifications

• Size: 3/4" x 3/4"
• Connections: BSP Female Inlet x BSP Female Outlet
• Materials: Brass
• Medium: Air and Water
• Set Pressure: 6 Barg
• Discharge Flowrate: 248.8 kg/hr
• Max Boiler Rating: 144.6 kW
• Temperature Range: +5 to +110 degC
• Product Code: 311560
• Notes: WRAS approved, CE marked

This high-quality safety valve ensures optimal performance and reliability in your heating system, making it a vital component for any domestic hot water setup.