Valfonta Model 248 Steam / Water Jet Ejector

The FSY90N Nano Scored Rupture Disc is a reverse-acting, micro-scored compression disc designed for high reliability and precision pressure relief. Its convex shape remains stable under operating pressure and only inverts at the set reverse pressure. Capable of operating at up to 95% of its burst pressure, the disc withstands thousands of pressure cycles without loss of performance. When activation occurs, it opens fully within milliseconds along the scored pattern, producing no fragments.

FSY90N discs are less affected by temperature fluctuations than conventional rupture discs, making them ideal for processes with wide temperature variations. They are suitable for gas and liquid applications (with a gas cushion where required) and are commonly used to protect pressure relief valves. A broad selection of materials and thicknesses provides excellent corrosion resistance, with optional PTFE lining available for enhanced chemical protection. Vacuum support is not required.

Key Specifications:

• Sizes: 1" (DN25) to 8" (DN200)

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

• Burst Pressure Range: 0.2–70 bar g (depending on size and material)

• Tolerance: ±5% to ±20%

• Operating Margin: 90% standard, up to 95% in suitable conditions

• Temperature Range: -196°C to 600°C

• Fragmentation: None – clean, full opening

• Use Under Valve: Yes

• Corrosion Resistance: Very good

• Linings: Optional

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

• Rupture Detection: Electrical, magnetic, inductive, optical

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

### NABIC 500F Flanged High Lift Safety Valve The NABIC 500F Flanged High Lift Safety Valve is expertly engineered for unvented hot water heating systems, where a robust emergency steam relief capability is imperative. With its exceptional capacity and durable PTFE seating, the NABIC 500F is also ideally suited for steam, air, and inert gas applications. For situations demanding enhanced sealing capabilities, a PTFE to Viton seating design is available. Additionally, NABIC Valves are now backed by an industry-leading 5-Year Guarantee, ensuring peace of mind and reliability. #### Specifications - **Sizes:** - 3/4" x 1" (DN20) - 1" x 1.1/4" (DN25) - 1.1/4" x 1.1/2" (DN32) - 1.1/2" x 2" (DN40) - 2" x 2.1/2" (DN50) - 2.1/2" x 3" (DN65) - **Connections:** - Flanged Inlet (PN16 or ANSI150) x Female BSPP Outlet - **Materials:** - Gunmetal Body - PTFE Seat - **Set Pressure:** - 1.0 to 12.5 Barg (DN20 to DN25) - 0.4 to 12.5 Barg (DN32 to DN65) - **Temperature Range:** - -20°C to 195°C Max **Note:** We set and test the valves to your specified pressure before shipping to ensure optimal performance. Upgrade your safety and efficiency in unvented hot water heating systems with the NABIC 500F Flanged High Lift Safety Valve—where quality meets reliability.

The Altecnic / Caleffi 313 Relief Valve with Gauge (Product Code: 313560) is an essential component for domestic hot water systems and heating setups. Designed to safeguard hot water cylinders and boilers, this valve is tailored to ensure optimal safety by releasing excess pressure. Upon reaching the designated discharge pressure, the valve automatically opens, venting to the atmosphere and preventing hazardous pressure levels that could jeopardise the boiler, hot water storage cylinder, and nearby personnel. This model is supplied complete with a built-in pressure gauge for added convenience and monitoring.

Specifications

• Size: 3/4" x 3/4"
• Connections: BSP Female Inlet x BSP Female Outlet
• Materials: Brass
• Medium Compatibility: Air and Water
• Set Pressure: 6 Barg
• Discharge Flow Rate: 248.81 kg/hr
• Maximum Boiler Rating: 144.6 kW
• Operating Temperature Range: +5 to +110°C
• Product Code: 313560

Additional Information

• WRAS Approved
• CE Marked
• Pressure Gauge Included

Ensure the safety and efficiency of your heating systems with the Altecnic / Caleffi 313560 Relief Valve – the reliable choice for managing pressure in your domestic hot water applications.