Mariani Flanged Gate Valves are designed for efficient flow isolation in high-pressure and high-temperature applications. Engineered with precision machining and durable materials, these valves provide long-lasting performance in steam, water, oil, and gas systems. The flanged connections ensure secure installation, making them ideal for industrial and commercial piping networks.

Key features and benefits.

Key Features

The robust flanged connections provide a secure, leak-proof seal, ensuring long-term durability in high-pressure applications. This design allows for easy installation and maintenance, reducing downtime in industrial systems.

Key Features

The gate valve's design enables minimal pressure drop and unrestricted media flow, optimising system efficiency. This makes it ideal for applications requiring high flow rates and reduced turbulence.

Key Features

Engineered for bubble-tight sealing, the valve ensures no leakage even under extreme conditions. Its high-quality construction enhances performance in demanding environments, such as steam and petrochemical systems.

The Mariani 327 Flanged Gate Valve is a high-performance shutoff valve designed for industrial and commercial applications requiring a working pressure range of 150-250 PSI. Built for reliable flow isolation, this gate valve offers a rugged construction with a full-bore design that minimises pressure drop, making it ideal for water, steam, oil, and gas systems. Its flanged ends ensure secure, leak-proof connections, simplifying installation and maintenance in demanding environments.

Size range:	DN20 - DN350 (3/4" - 14")
Connection:	Flanged
Working pressure:	150-225psi
Material:	Bronze
Applications:	Potable/Waste/Sea Water, Cooling Systems, Oil, Gases, Air, Desalination, Marine Applications

Find Out More

Document

Datasheets

General Marine services can include work for a number of various applications including Fire Protections Sprinkler Systems, Wastewater, Potable Water, Cooling & Ballast, HVAC, Ship Side Valves and Ballast Systems. Our marine valves are produced with the highest quality materials, ensuring durability and longevity.

A marine gate valve is a flow control valve designed for full open or full close operation in marine applications. It uses a gate-like mechanism that moves up and down to allow or stop fluid flow, making it ideal for seawater, fuel, ballast, and oil systems.

Marine gate valves are typically made from bronze, stainless steel, and other corrosion-resistant alloys to withstand harsh saltwater environments and high-pressure applications.

They are commonly used in ballast systems, cooling water lines, fire protection, fuel transfer, and bilge systems on ships and offshore platforms.

Gate valves are designed for on/off flow control, providing unrestricted flow when open, whereas globe valves offer precise throttling and flow regulation but create more pressure drop.

Yes, marine gate valves are built to withstand high pressures and temperatures, making them suitable for demanding applications like steam and hydraulic systems on vessels.

Yes, when fully closed, the wedge or parallel gate design ensures a leak-tight seal, minimising fluid loss and preventing backflow.

Yes, they can be operated manually (handwheel), electrically, pneumatically, or hydraulically, depending on the system’s requirements.

Regular flushing, lubrication, and inspection of the gate, stem, and sealing surfaces help prevent corrosion and ensure smooth operation in marine environments.

Yes, some are manufactured to comply with marine classification societies such as ABS, DNV, Lloyd’s Register, and Bureau Veritas, ensuring they meet strict safety and performance requirements.

Low Flow Resistance – Offers unrestricted flow when fully open.
Durability – Built with marine-grade materials to withstand harsh conditions.
Versatility – Suitable for a wide range of fluids, including seawater, fuel, and steam.

No, gate valves are not recommended for throttling, as partially opening them can cause erosion of the gate and seat, leading to premature wear.

Marine gate valves can be sourced from specialised marine valve suppliers, shipbuilders, and offshore equipment distributors that meet industry certification standards.

Please feel free to request information and advice using the form below or call us on 0151 547 1221

Mariani Flanged Gate Valves