Brownall Fig 1688 Three Way Boiler Vent Valve

The Altecnic / Caleffi 312 Safety Valve - 312405CST is essential for domestic hot water systems, providing vital protection for hot water cylinders and heating systems, including boilers and other components. This safety valve is meticulously selected for its specific set pressure. As system pressure increases, the valve activates once the discharge pressure is reached, releasing excess pressure into the atmosphere. This action safeguards both the boiler and hot water storage cylinder, ensuring safe operational conditions for personnel nearby.

Specification

Size: 1/2" x 15mm
Connections: BSP Male Inlet
Materials: Brass
Medium: Air and Water
Set Pressure: 4 Barg
Discharge Flowrate: 178.2 kg/hr
Max Boiler Rating: 103.3 kW
Temperature Range: +5 to +110 °C
Product Code: 312405CST
Notes: WRAS approved, CE marked

The Altecnic / Caleffi 312405CST Safety Valve is perfect for ensuring compliance with safety standards in your heating systems, making it a smart choice for any domestic hot water setup.

The FSKRDN NanoScored rupture disc incorporates advanced technology to deliver highly reliable overpressure protection. The convex disc maintains its original shape during normal operation and only reverses at the set burst pressure. It supports operating-to-burst pressure ratios of up to 95% and withstands thousands of pressure cycles without loss of performance. When activated, the disc opens fully in milliseconds along the scored line, producing no fragments. Compared with conventional designs, it is less sensitive to temperature fluctuations, making it ideal for applications with wide temperature variations.

Thanks to its innovative construction, the FSKRDN can operate with liquids only, including in cycling and pulsating conditions, without compromising safety margins. It is particularly well suited for isolating safety relief valves. A wide selection of materials and optimized thickness provide excellent corrosion resistance, which can be further enhanced with an optional PTFE lining on the process side. The disc does not require vacuum support and is capable of withstanding high back pressures.

Key Specifications:

• Sizes: 1" (DN25) to 36" (DN900)

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

• Burst Pressure Range: 0.41–137 bar g (6–2000 psi g), depending on size and material

• Krl: 0.48

• Tolerance: ±5% to ±20%

• Temperature Range: –196°C to 480°C

• Operating Margin: 90% (up to 95% depending on service conditions)

• Fragmentation: None

• Use Under Valve: Yes

• Corrosion Resistance: Very good

• Linings: Optional

• Holder Options: FSHR/A, FSHR/P, FSHR/F, FSHTC

• Rupture Detection: Electrical, Magnetic, Inductive, Optical

• Certifications: ASME (UD Stamp), PED (CE), ATEX EX II 2 GD

**Features & Benefits of Hattersley Strainers** - Say goodbye to the issues caused by contaminants in piping systems with Hattersley strainers. - Our strainers feature WRAS-approved internal and external epoxy powder coating for enhanced durability. - Equipped with WRAS-approved gaskets to ensure a secure and reliable seal. **Specifications** - End flanges conform to BS EN 1092-2 PN16, Section 3.2, Table 11, featuring a raised face and typically supplied pre-drilled. - Each strainer comes with a stainless steel perforated element, designed with 1.5mm diameter holes for optimal filtration. - Please note that this product is unsuitable for use with group 2 liquids, as outlined in the Pressure Equipment Directive 2014/68/EU. - Bosses are drilled, tapped, and plugged for ease of installation. **Pressure/Temperature Rating** - Suitable for PN16 applications with a temperature range of -10 to 85°C. Optimise your piping systems efficiently with reliable Hattersley strainers that meet industry standards and provide exceptional filtration capabilities.