Hattersley 4970 PN16 Butterfly Valve - Lever Operated

Product Specifications

Sizes Available: 1" Connections: Screwed BSPP
Materials: Stainless Steel (Grade 67.2)
Disk Material: Viton
Joints & Seals: Designed for Mediums: Non-toxic Steam and Gases
Set Pressure Range: 0.05 to 3 Barg
Temperature Range: -60 to +150 °C
Design Classification: TUV Certified
Additional Notes:

The FSSCRA rupture disc is an ASME-approved compression or reverse-acting disc featuring precision micro-scored petals with four, six, or more radial scores. This design ensures rapid, full opening while reducing the risk of petal separation, making the disc suitable for both low and high burst pressure applications.

Designed for use with gases and liquids (with a gas cushion), the FSSCRA performs reliably in cycling and pulsating conditions without compromising safety margins. The disc responds to overpressure within milliseconds and opens cleanly without fragmentation, making it particularly well suited for protecting safety relief valves.

With an operating-to-burst pressure ratio of up to 95%, the FSSCRA delivers excellent efficiency and stability. It offers strong corrosion resistance, which can be further enhanced with an optional PTFE lining, and in many applications can operate under full vacuum without the need for additional supports. The design complies 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: 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

The Berluto DRV378SW Seawater Reducing Valve has been expertly designed for applications involving seawater, making it ideal for use on ships, oil platforms, and in desalination plants.

Product Specifications

Available Sizes: 1/2" (DN15), 3/4" (DN20), 1" (DN25), 1 1/4" (DN32), 1 1/2" (DN40), 2" (DN50)

Connections: Female BSP Inlet x Female BSP Outlet

Materials: Red Bronze Body / Bonnet: Brass up to DN32; from DN40: Cast Iron

Disk: Joints & Seals: Diaphragm: NBR; Seals: NBR

Medium: Seawater

Inlet Pressure (Max): 25 Barg

Outlet Pressure Range: 0.5 to 9 Barg

Cv Range: Contact us for details

Temperature: Max 75°C

Approvals: PED 97/23/CE Category I

Notes: (a) Includes built-in gauge ports (b) Minimum pressure drop between inlet and outlet: 1 Barg (c) A sizing calculator is available in the TECHNICAL INFO section of the menu above.

Enhance your seawater management systems with the reliable and efficient Berluto DRV378SW Seawater Reducing Valve. Perfectly suited for marine, industrial, and desalination applications, this valve ensures optimal pressure control and durability. For more information and to explore our comprehensive range of products, visit our website today.