Hattersley Fig 4923 PN25 Butterfly Valve - Lever Operated

The FSSCDA rupture disc features precision micro-scored petals with four, six, or more radial scores, ensuring fast, controlled opening while minimising the risk of petal separation. This design makes the disc particularly suitable for high burst pressure applications. It can be used with both gases and liquids, including under cycling and pulsating conditions, without reducing safety margins. In an overpressure event, the disc activates within milliseconds and opens cleanly without fragmentation, making it ideal for protecting safety relief valves.

The FSSCDA supports an operating-to-burst pressure ratio of up to 85% and offers excellent corrosion resistance, which can be further enhanced with an optional PTFE lining. In many applications, the disc can also operate under full vacuum conditions without the need for support, providing added flexibility. These discs comply fully with ASME Section VIII, Division 1 requirements.

Key Specifications:

• Sizes: 1" (DN25) to 36" (DN900)

• Materials: Stainless steel, Alloy 201, 400, 600, 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%

• Temperature Range: –196°C to 600°C

• Operating Margin: Up to 85%

• Fragmentation: None

• Use Under Valve: Yes

• Corrosion Resistance: Very good

• Linings: Optional

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

• Rupture Detection: Electrical, Magnetic, Inductive, Optical

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

Introducing the Reliance Valves 6247 Series – a comprehensive range of high flow rate pressure reducing valves designed to deliver precise pressure control for both commercial and industrial applications. Crafted from corrosion-resistant bronze, these valves boast a robust design that allows for installation in any orientation, ensuring versatility in diverse settings. With a maximum working temperature of 60°C, the 6247 Series valves are adjustable between 1.6 and 6.0 bar, making them suitable for a variety of operational needs. The innovative one-piece cartridge facilitates quick and hassle-free installation and maintenance, minimising downtime. Available sizes include DN65 (PRED624001), DN80 (PRED624002), and DN100 (PRED624003) – perfect for your pressure regulation requirements. Experience enhanced reliability and performance with Reliance Valves' 6247 Series today.

**Product Specification** **Size:** 1/4" x 3/8", 3/8" x 3/8" **Connections:** Screwed BSPP (NPT and Ermeto available upon request) **Materials:** Stainless Steel **Orifice Size:** 8mm **Disk Material:** EPDM for pressures between 0.40 to 2 Barg; Viton for all other pressures **Joints & Seals:** NBR, FPM, EPDM (varies by model) **Medium Compatibility:** Suitable for Steam, Gases, and Liquids **Set Pressure Range:** 0.4 to 200 Barg (subject to size) **Operating Temperature:** -40 to 130 °C **Notes:** For further details on compatibility and model-specific features, please contact us directly.