Laminar Pte Ltd Singapore

Laminar Pte Ltd

Gate Valves

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Gate Valves

Gate valves have a long-standing history of serving critical roles across various industries, including water and gas utilities, transmission pipelines, oil and gas mains, power plants, chemical processing, sewer, firefighting and water treatment facilities.

Gate valves have a long-standing history of serving critical roles across various industries, including water and gas utilities, transmission pipelines, oil and gas mains, power plants, chemical processing, sewer, firefighting and water treatment facilities.

A gate valve is generally used to shut off the fluid flow entirely or, in the fully open position, provide full flow in a pipeline, with its wedge-shaped disk moved by a linear motion stem. When fully opened, gate valves offer minimal pressure drop, making them ideal for controlling the flow of fluid or gas or unclean fluids.

These valves are capable of sealing both high and low fluid pressure.

Gate valves are available in different materials such as ductile iron, WCB steel, bronze or stainless steel, and their specific type is determined by construction features like wedge shape, sealing type, manufacturing standard, valve body, and disk materials.

They can also be categorised based on wedge type, including resilient-seated and metal-seated gate valves and rising or non-rising stem gate valves (NRS).

A solid wedge valve is versatile and compatible with a wide range of fluids, making it suitable for installation in any position. Solid wedges are commonly used in situations with high flow or where turbulent flow is present, such as steam service.

Gate valves are commonly operated manually by a threaded stem that connects the actuator (either a hand wheel or shaft) to the stem of the gate.

However, electric, pneumatic, or hydraulic actuators can be employed for operation in cases requiring frequent switching or critical applications, ensuring precision and reliability.

In contrast, knife gate valves are lighter valves used for media with high solid contents and low operating pressure. They feature a shut-off plate that ensures a tight closure by cutting into the media like a knife, minimising stagnant areas and potential clogging.

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The Types of Gate Valves that Laminar offers:

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Knife Gate Valve

A versatile valve used across a wide range of industries, the knife gate valve offers unique construction and functionality, ensuring efficient shut-off
Laminar Singapore Pvt Ltd

Sluice Valve

Laminar Sluice Valve with bolted cover connection fully complies with EN 1074/ BS 5163 and includes WRAS-approved sealing.
Laminar Singapore Pvt Ltd 1

Metal Seated Gate Valve

Laminar designs metallic-sealing gate valves for high operating pressures & applications involving wastewater, sewage & others.
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Penstocks Gate Valve

Laminar offers penstocks wall-mounted design that can be fitted into walls (to close circular, square, or rectangular ports) or channels design

FAQ's

Gate valves are an essential part of any piping system, providing reliable shut-off and control over the flow of fluids or gas – enabling them to serve in a variety of applications. The key components of a gate valve are the body, bonnet, stem, disk, and seat rings.

Valve Bodies: Gate valve bodies serve as the foundation for the valve, providing a chamber through which media can flow. The body comprises two halves containing the valve’s internal parts and providing access to them. They are available in different materials, such as cast steel, cast iron, stainless steel, brass, and alloy steel. The required service conditions determine the material.

Bonnets: The valve bonnet is a cylindrical part that covers the valve body and encloses all other parts. The bonnet holds the stem and disk in place while securing the seal between the two halves of the body.

The bonnet is available in different materials, depending on the specific application requirements, such as screwed bonnet, union bonnet, bolted, or pressure seal bonnet depending on the application.

Stems: The valve stem is responsible for moving the disk back and forth. The stem moves the wedge-shaped disk up and down to regulate media flow through the valve; when fully open, it allows unrestricted flow, while a completely closed position creates a tight seal preventing any leakage.

It is usually made from stainless steel, brass, or bronze and is available in rising stem or non-rising stem (NRS) designs. It typically comes with DI or steel headstock above ground.

Disks: The disk is the main flow-controlling element in a gate valve. It moves up and down depending on the operating conditions, allowing or restricting flow. Gate valve disks feature two seating surfaces that come into contact with the valve seats and create a seal that halts the flow.

Seat Rings: The seat ring is the device that seals the valve when it is in the closed position. It helps to reduce any potential leakage. They are made from rubber, PTFE, or graphite for the required sealing.

Gate valves are a highly reliable option for controlling the flow of various media in water and gas utilities and industrial applications, and their design ensures longevity even in harsh environments.

Some gate valve types used in various applications and industries:

  • Resilient-seated gate valve
  • Metal-seated gate valve
  • Knife gate valve
  • OS & Y Gate Valve
  • Solid wedge gate valve
  • Flexible wedge gate valve
  • Parallel slide gate valve

The two main types are resilient-seated and metal-seated gate valves.

A resilient-seated gate valve features a vulcanised soft elastomeric seal that ensures tight shutoff without compromising the valve’s longevity or performance; they are often used in low to medium-pressure applications.

On the other hand, a metal-seated gate valve offers superior sealing capabilities due to its rigid construction and has a higher pressure rating than resilient-seated valves; it is often used in high-pressure applications.

 

 

Gate valves are used for a variety of industrial applications, from oil and gas refineries to water pipe and water treatment plants. They are essential in controlling the flow path of various media, allowing users to regulate and adjust the pressure as needed.

Gate valves feature a unique design that makes them highly reliable and efficient; their wedge-shaped disk is moved by a linear motion stem, creating an effective seal when fully closed.

This design helps to reduce leakage and provide consistent pressure control or fluid flow across different applications.

Additionally, gate valves have a small footprint on the pipe axis and do not significantly impede fluid flow when fully open.

Gate valves are ineffective in accurately regulating flow rates due to their mechanical design. Using gate valves in throttling duty can harm the gate valve and significantly cut its operational lifetime.

Actuated valves and gate valves are two different types of valves that serve the same purpose – regulating the flow path. While both are reliable and efficient, some key differences make one a better choice for specific applications.

Actuated valves utilize electric, pneumatic or hydraulic actuators, ensuring precision and reliability in critical applications or when frequent switching is required. Because they don’t rely on manual operation, these valves can be remotely operated and monitored using computers or controllers.

On the other hand, gate valves are typically operated manually using a handwheel or shaft. They can be used in low to medium-pressure applications. They feature a shut-off plate that cuts into the media like a knife, ensuring tight closure and minimizing potential clogging.

Gate valves come in a wide range of sizes to meet the needs of any industrial application. From small 1/2″ valves up to large 60″ valves, they can be used on pipelines from 2″ to more than 500″.

The size of your gate valve will depend on the specific requirements of your application; larger valves are better suited for higher-pressure applications, while smaller valves are ideal for low-pressure systems or where space is limited.

No matter the size, gate valves offer reliable shut-off and precise control over media flow.

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