Mariani Gate Valves

Mariani Gate Valves are designed for high-performance isolation in marine, offshore, and industrial applications. Built from corrosion-resistant materials such as bronze and stainless steel, these valves provide reliable shutoff for seawater, fuel, steam, and other critical fluid systems. Their full-bore design ensures minimal pressure drop, making them ideal for applications where unrestricted flow is essential.

Threaded Gate Valves

Mariani Threaded Gate Valves are built for reliable fluid control in marine and offshore environments, where durability, corrosion resistance, and smooth operation are essential. Designed for seawater, fuel, oil, and steam systems, these valves provide full, unobstructed flow with minimal pressure drop, making them an ideal choice for shipboard and offshore installations.

Featuring a threaded connection, these gate valves offer easy installation and maintenance, making them perfect for smaller piping systems where flanged connections may not be necessary. Manufactured from marine-grade bronze or stainless steel, they provide exceptional resistance to corrosion and wear, ensuring long-term performance in harsh saltwater environments.

Size range: DN08 - DN150 (1/4" - 6")
Connection: Threaded
Working Pressure: 450psi
Material: Bronze
Applications: Potable/Waste/Sea Water, Cooling Systems, Oil, Gases, Air, Desalination, Marine Applications
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Flanged Gate Valves

Mariani Flanged Valves are designed to withstand the extreme conditions of marine environments, providing reliable flow control, durability, and resistance to corrosion. These valves are essential components in shipboard and offshore systems, ensuring safe and efficient operation of seawater, fuel, ballast, and steam applications. Built from high-grade marine alloys such as bronze and stainless steel, they are specifically engineered to handle high pressures, temperature variations, and aggressive media found in maritime operations.

Size range: DN10 - DN350 (3/8" - 14")
Connection: Flanged
Working Pressure: 150 - 225psi
Material: Bronze
Applications: Potable/Waste/Sea Water, Cooling Systems, Oil, Gases, Air, Desalination, Marine Applications
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Marine Services

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.

Frequently Asked Questions

What is a marine gate valve?

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.

What materials are marine gate valves made from?

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

Where are marine gate valves used?

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

How do marine gate valves differ from globe valves?

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.

Can marine gate valves handle high pressure?

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.

Do marine gate valves provide a tight seal?

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

Are marine gate valves available with different actuation options?

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

How do you maintain a marine gate valve?

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

Are marine gate valves classified by any standards?

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.

What are the benefits of using a marine gate valve?

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.

Can marine gate valves be used for throttling?

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

Where can I purchase marine gate valves?

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

FAQ

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Mariani Gate Valves