Threaded Gate Valves

Marine Threaded Gate Valves are designed for on/off flow control in shipboard and offshore applications where compact, durable, and corrosion-resistant valve solutions are required. These valves feature threaded (screwed) connections, making them ideal for smaller piping systems where easy installation and maintenance are key. Constructed from marine-grade materials such as bronze and stainless steel, they ensure long-lasting performance in harsh saltwater environments.

Key Features

Key features and benfits.
1

Key Features

The threaded connection allows for quick and simple installation, making these valves perfect for confined spaces in marine systems. Their compact size ensures easy integration into smaller pipelines without the need for complex fittings or welding.
2

Key Features

Manufactured from bronze, stainless steel, or other high-quality alloys, these valves resist rust and degradation in harsh saltwater environments. This ensures long-term durability, reducing the need for frequent replacements and maintenance.
3

Key Features

When fully open, the gate design allows for maximum fluid passage with minimal pressure drop, improving system efficiency. The leak-tight shutoff mechanism ensures secure isolation of fluids, preventing backflow and enhancing safety in marine applications.

310 Series

The Mariani 310 Series Globe Valve is designed for precise flow control and durability in demanding industrial applications. Engineered for a working pressure of 225 PSI, this valve ensures optimal performance in steam, water, oil, and gas systems. The globe valve's body construction provides exceptional strength and resistance to high temperatures, making it suitable for critical process environments.

Size range: DN08 - DN300 (1/4" - 6")
Connection: Threaded
Working pressure: 225psi
Material: Bronze
Applications: Potable/Waste/Sea Water, Cooling Systems, Oil, Gases, Air, Desalination, Marine Applications
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315 Series

The Mariani 315 Series Globe Valve is a high-performance solution for industrial applications requiring precise flow control and durability under high-pressure conditions. Designed to handle working pressures up to 450 PSI, this valve ensures reliable operation in demanding environments such as steam, water, oil, and gas systems.

Size range: DN08 - DN100 (1/4" - 4")
Connection: Threaded
Working pressure: 450psi
Material: Bronze
Applications: Potable/Waste/Sea Water, Cooling Systems, Oil, Gases, Air, Desalination, Marine Applications
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317 Series

The Mariani 317 Series Gate Valve is a high-performance solution for industrial flow control, designed to handle a working pressure of 225 PSI with low-pressure drop and tight shutoff. Built for reliability in demanding applications, this gate valve is ideal for use in steam, water, oil, and gas systems. The Mariani 317 Series Gate Valve is a trusted choice for on/off control in pipelines where unrestricted flow and long-lasting durability are critical. Whether used in refineries, power plants, or process industries, this valve delivers consistent performance and reliability.

Size range: DN08 - DN100 (1/4" - 4")
Connection: Threaded
Working pressure: 450psi
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.

318 Series

The Mariani 318 Series Gate Valve is built for high-pressure applications, offering a robust working pressure of 700 PSI. Designed for on/off flow control, this heavy-duty valve ensures minimal pressure drop and tight shut-off, making it a reliable choice for demanding industrial environments. The Mariani 318 Series Gate Valve is widely used in oil & gas, petrochemical, and steam applications, where high-pressure handling is crucial. With its reliable shut-off mechanism, it enhances system safety and efficiency, making it a go-to choice for industrial professionals.

Size range:
Connection: Threaded
Working pressure:
Material: Bronze
Applications: Potable/Waste/Sea Water, Cooling Systems, Oil, Gases, Air, Desalination, Marine Applications
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320 Series

The Mariani 320 Series Gate Valve is built for high-pressure applications, offering a working pressure of 700 PSI for reliable shut-off and flow isolation. Designed to handle steam, water, oil, and gas, this heavy-duty gate valve ensures long-lasting performance in industrial and commercial piping systems.

Size range: DN08 - DN100 (1/4" - 4")
Connection: Threaded
Working pressure: 700psi
Material: Bronze
Applications: Potable/Waste/Sea Water, Cooling Systems, Oil, Gases, Air, Desalination, Marine Applications
Find Out More

319 Series

The Mariani 319 Series Gate Valve is built for high-pressure applications, offering a working pressure of 450 PSI to handle demanding industrial environments. Designed for full flow and minimal pressure drop, this valve ensures efficient shut-off capabilities for steam, water, oil, and gas systems. Its durable construction and superior sealing performance make it a reliable choice for critical process operations.

Size range: DN08 - DN100 (1/4" - 4")
Connection: Threaded
Working pressure: 450psi
Material: Bronze
Applications: Potable/Waste/Sea Water, Cooling Systems, Oil, Gases, Air, Desalination, Marine Applications
Find Out More

Datasheets

  • Document
Datasheets

310 Datasheet
  • Document
Datasheets

315 Datasheet
  • Document
Datasheets

317 Datasheet
  • Document
Datasheets

318 Datasheet
  • Document
Datasheets

319 Datasheet
  • Document
Datasheets

320 Datasheet

Frequently Asked Questions

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.

FAQ

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Mariani Threaded Gate Valves