Marine Globe Valve – All You Need to Know Before Buying

As much as in other industries, fluid management and flow are top priorities for ships. The marine globe valve is integral to a watercraft's pumps and plumbing system. These valves control the flow, pressure, and quantity of liquid in various marine applications. They differ in structure and function depending on the type pattern and flow action. In this edition of our spare parts series, we are dropping an extensive guide to the eminence of globe valves in marine vessels. 

What is a Marine Globe Valve

A globe valve is an intricate component that regulates linear motion in the stream of liquid and gaseous substances flowing through the pipeline system. The device is called a globe valve due to its bulb-shaped design. Marine globe valves feature specific functional characteristics:

• It works in systems, allowing the fluid to flow in one direction
• The framework must support quick opening
• The flow of fluids is always in linear motion
• It allows an equal percentage of substance to flow

Structure and Design

Marine globe valves have a globe-shaped body comprising a moving disc/plug, stem, and static seat. The stem is connected to a handwheel at the top and securely held with a washer and nut at the bottom. It connects the handwheel to the movable disk within the body.

Functions and Applications

These valves offer diverse fluid flow possibilities and perform multiple functions depending on the required flow effect. The unique composition makes marine globe valves suitable for use in stringent environments. Marine valves are made of heavy-duty material for corrosion resistance and safety when processing hazardous chemicals. The globe valves for marine applications work well in high- and low-pressure flows. It is an eminent part of the cooling systems where flow management is vital. Integrating these devices with the fuel oil system is beneficial for preventing leakage. 

Prime Components of a Marine Globe Valve

Body

The body is the chief component of a marine globe valve housing a set of crucial internal spare parts. It features two ports (inlet and outlet) for seamless flow of liquid and gaseous substances. The position of the ports and depth of the spherical body depends on the valve type and application.  

Bonnet

It is the upper part of the globe valve housing the stem and packing.

Stem

The stem is a threaded rod attached to the handwheel at the top and the disk or plug at the bottom. 

Plug/Disk

A disk or plug is the moving part within the body of the marine globe valve. The disk's upward and downward movement influences the fluid flow through the body.

Actuator/ Handwheel

A globe valve may have a manual or automatic handwheel. The component allows the technicians to control the valve operation. You may be interested in: Cummins Marine Diesel Engine Exhaust Valve – Ultimate Guide

Marine Globe Valves - Types/ Patterns

Straight Pattern/ Z-Type/ Z Pattern

A Z-type globe valve has inlet and outlet ports in vertical alignment. The design of a straight pattern valve has a globoid body housing a moving disk connected to the stem at the lower end and a static seat. These structures boast a linear flow mechanism where the fluid inlet port is at the bottom and the outlet is at the top. During operation, the disk moves up and down to regulate the flow.

Y-Pattern

Y-pattern globe valves have the inlet and the outlet ports at a 45-degree angle. The framework supports applications requiring reduced pressure and turbulence within the valve body. It works excellently in minimizing erosion. The 45-degree angular flow path is ideal for operations where high temperature and high pressure are critical factors.

Angle Pattern

The orientation of inlet and outlet ports in the angle pattern valves is 90 degrees. The structure simplifies the process of changing direction for fluids. It is an excellent choice for applications where changing direction is essential in limited spaces.

How Does the Marine Globe Valve Work

The globe valve comprises a seat at the body's center and always remains parallel to the pipeline. These valves feature a stem attached to the disk at the bottom and the handwheel at the top. The movable disk goes up and down when the handwheel rotates (manually or using an actuator). When the disk moves to the extreme bottom of the body, it closes the opening in the seat and sits on the seat ring to stop the flow. The flow resumes when the disk moves upwards, providing a gap for the fluid to pass through.  

Material and Composition

Typically, the marine globe valves have a body of cast iron, carbon or stainless steel, and other alloys. Most of these valves have bronze disks and seat rings. The stainless-steel modules are ideal for applications where temperatures exceed 350°C. Heat-treating the mating faces for the required differential hardiness is easy with stainless-steel valves. It is also resistant to galling and seizing. Usually, globe valves have cobalt-based alloy trims.

Where to Buy an OEM Marine Globe Valve

Alfa Marine Spare Parts is the leading provider of genuine marine engines, spare parts, and electrical fixtures. We offer an extensive range of marine valves from reputed brands comprising Cat, Cummins, Perkins, Scania, Yanmar, Volvo Penta, Detroit Deisel, Deutz, Wartsila, and others.  Here is a list of top-selling marine globe valves in our store gallery: 0504-0269 – Cummins Valve-Globe (RE56403) 0504-0257 – Cummins Valve-Globe (1-1/4NPT, BRONZE 125) 0504-0270 – Cummins Valve-Globe (AT13740) 5365694 – Cummins Valve-Globe We also offer a selection of marine exhaust valves and spare parts for seamless integration with turbo systems, extended engine lifecycle, and utmost energy efficiency. If you want a spare part for your engine or turbocharger, contact us with the part number. We offer a quote for the available items within 24-48 hours.