Hattersley Fig 816W PN16 Strainer

A marine overboard valve is an essential discharge valve utilised on ships to manage the release of fluids from internal systems into the sea. These valves play a crucial role in the safe and regulated disposal of various liquids, including seawater, bilge water, ballast, treated wastewater, and cooling water.

What is a Marine Overboard Valve?

• A valve situated on the outlet side of a system, located at or near the ship’s hull, designed to control discharge overboard (into the sea).
• Commonly installed in systems such as:
  • Bilge discharge
  • Ballast water discharge
  • Engine cooling water
  • Sewage and greywater (treated)
  • Scuppers and deck drains

We offer an extensive range of Overboard Valves from leading manufacturers. For tailored solutions to meet your needs, please do not hesitate to get in touch with us.

Product Specifications for Niezgodka Type 74 Flanged Valve

Sizes Available: 1/2", 3/4", 1", 1.1/4", 1.1/2", 2", 2.1/2", 3"

Connection Types: Flanged DIN or ANSI

Materials: Stainless Steel 316 or 304

Disk Materials: EPDM, PTFE or Viton

Joints & Seals: Diaphragm made from EPDM, PTFE or Viton

Suitable Mediums: Steam, Gases and Liquids

Maximum Inlet Pressure: 25 Barg (for sizes 1/2" - 1"), 16 Barg (for sizes 1" - 3")

Outlet Pressure Range: 0.004 to 0.96 Barg (varies by size)

Additional Information: This variant is the flanged version of the Niezgodka Type 74 valve, designed to provide robust and reliable performance across a range of applications, making it an ideal choice for industries requiring high-quality fluid control solutions.

Enhance your operation’s efficiency with the Niezgodka Type 74 Flanged Valve, meeting the highest standards of safety and durability while catering to diverse media types.

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