Gate Valves are a common type of valve consisting of a body, bonnet, gate and stem and are used to control the liquid and gas flow. Gate valves are primarily designed for on-off services.
They are typically used in applications such as oil and gas, water treatment and distribution, industrial process piping systems, etc. Gate valves open or close with a gate, or disc, which moves up or down within the body of the valve to affect fluid flow. They are typically operated either by a handwheel or an electric or pneumatic actuator.
Gate valves are operated manually or by an automated device such as a motor, solenoid, actuator, etc. When the gate is closed, it acts as a barrier and blocks flow. When open, the gate swings away from the seat allowing full flow through the valve. When closed, fluid flow is completely blocked.
Gate valves offer positive shutoff with minimal pressure drop; this makes them ideal for controlling liquid or gas flow in various applications. They’re also highly effective and easy to maintain due to their robust construction and simple design.
Gate valves are most suited to applications that require a fully open or closed position, rather than flow regulation. Using a valve with a partially open gate can cause damage to the valve body. Other valve types such as the butterfly valves may prove a more suitable valve for throttling (regulate flow) applications.
Several types of gate valves are available, including wedge gate valves, non-rising stem (NRS) gate valves, parallel slide gate valves, expanding gate valves and more. Each type is designed specifically for certain applications, so it’s imperative to use the right valve for the right application. Metal seated gate valves are designed for high-pressure service applications and are used to control flow in oil and gas pipelines.
Gate Valves can contain two stem types:
Typical gate valves have rising stems; a threaded valve stem that visibly lifts the gate up as the valve opens, making it easy to tell its position. These external stems are also convenient for maintenance purposes and offer a visual indication of the position of the valves (when the stem is raised the valve is open).
On the other hand, NSR valves have a hidden threaded stem that does not rise as the valve is opened. The stem is enclosed within the valve body, making the valve more compact and better suited to tight spaces. While the NRS valves do not have an external indication of valve position, they are designed to be automated with electric or pneumatic actuators and can still display a visual indication of whether the valve is open or closed.
The Wedge Gate Valve is a type of gate valve that uses a wedge-shaped disk to regulate flow. The wedge can be fully opened or closed, allowing for a tight shutoff with no pressure drop. This makes it ideal for applications such as oil and gas pipelines, water supply systems, etc.
Parallel slide gate valves are ideal for applications that require rapid on/off operation or frequent opening and closing. Removing the wedging from a wedge gate valve results in a lower operating force. The gate moves parallel to the flow, so it can provide a tight seal at various pressures. Supplied as both full and reduced (standard) bore patterns the design creates a low-pressure drop across the valve. They’re also easy to maintain and repair due to their simple design.
This is the most frequently used type of gate valve and is designed for efficient flow control in industrial applications. Similar to the parallel gate valve it features a blade that slices through fluids or bulk solids as it closes, creating an effective seal. The knife gate valve is often used in mining, slurries, sewage, wastewater and pulp paper industries.
Gate Valves are incredibly versatile and can be used in many different industries as they function well in a wide range of applications from low pressure to high pressure and high temperature. They can offer excellent uni-directional or bi-directional sealing capabilities as well as providing excellent flow rates. In addition, to this, they are highly reliable due to their robust construction and simple design. This makes them ideal for a variety of applications that require precise flow control.
These valves are top entry valves, for some types of gate valve it is possible to carry out refurbishment with the body of the valve remaining in the pipeline, so they are easy to maintain and disassemble.
The gate valve range is available in the following body styles and configurations:
When selecting a gate valve, it’s essential that the valve has been designed to meet the requirements of recognised industry standards such as:
Our range of Gate Valves supports various industries and specific industry applications such as:
Gate Valves are commonly used in many industries such as oil and gas, chemical, marine, water treatment and more. They can be used for regulating the flow of liquids or gases in pipelines or systems, controlling pressure levels and isolating components from one another. In addition, they are also often found in irrigation systems, fire safety and protection systems and cryogenic systems.
Gate Valves are a key component of your site infrastructure and pipelines, offering high-quality isolation solution and an effective seal for a variety of different liquids and gases. The wide variety of types available allows the right valve to be selected for any application, ensuring its success. When properly installed and maintained, gate valves can deliver a through-life solution.
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