Medenus RS250 Gas Pressure Regulator & Shut Off Valve

The Altecnic / Caleffi 312 Relief Valve - Pushfit - A312401CST is an essential component for domestic hot water systems, designed to safeguard hot water cylinders, as well as heating systems, including boilers and other critical components. This relief valve is specifically selected according to the required set pressure to ensure optimal performance. When the system pressure exceeds the predetermined discharge pressure, the valve activates, releasing excess pressure to the atmosphere. This vital function helps to prevent dangerous pressure levels that could potentially harm the boiler, hot water storage cylinder, and surrounding personnel.

**Specifications**

**Size:** 1/2" x 1/2"
**Connections:** 1/2" Pushfit Inlet x BSP Female Outlet
**Materials:** Brass
**Medium:** Air and Water
**Set Pressure:** 3 Barg
**Temperature Range:** +5 to +110 °C
**Product Code:** A312401CST
**Notes:** WRAS approved, CE marked, Pressure gauge included

Features & Benefits

•Allows for the drainage of the system without the need to remove pipework
•Prevents sediment accumulation
•Enhances the longevity of pipework

Specification

•90º operation. Available sizes range from 1/2" to 1", supplied complete with cap and strap.
•Plugs feature square heads with a slot to indicate the plug's position.
•Malleable iron levers can be provided upon request.
•The malleable iron lever can be pinned to the plug head for an additional charge.
•Fitted with taper threads as per BS EN 10226 (ISO 7-1), formerly known as BS 21.
•Please note: Figure 81HU Gland Cocks are not suitable for gas applications.

Pressure/Temperature Rating

•Rated for 10 bar at temperatures ranging from 0 to 120ºC

The FSSCDF Forward Acting Rupture Discs feature precision micro-scored sections that open in controlled petals, using four, six, or more radial score lines to ensure a clean, reliable opening while minimising the risk of petal separation. This design makes them particularly well suited for high burst pressure applications and for systems operating under cycling or pulsating conditions with gases or liquids, without compromising safety margins.

These discs respond to overpressure within milliseconds, opening fully without fragmentation, and are ideal for protecting safety relief valves. They support an operating-to-burst pressure ratio of up to 85%, offer excellent corrosion resistance, and can be further enhanced with an optional PTFE lining. In many applications, the discs can also withstand full vacuum conditions without additional supports, providing flexible installation options.

Key Specifications:

• Sizes: 1" (DN25) to 36" (DN900)

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

• Burst Pressure Range: 2–413 bar g (30–6000 psi g), depending on size and material

• Krl: 1.33

• Tolerance: ±5% to ±20%

• Operating Margin: Up to 85%

• Temperature Range: –196°C to 600°C

• Fragmentation: None – clean, petal opening

• Use Under Valve: Yes

• Corrosion Resistance: Very good

• Linings: Optional

• Holders: FSHI/A, FSHI/P, FSHI/F, FSHTC

• Rupture Detection: Electrical, Magnetic, Inductive, Optical

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