Different types of gate valves and how they work

The different types of gate valves are divided according to how they operate and in terms of their uses. There are two types of gate valves in terms of how they work:

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Ordinary gate valves

These types of gate valves are divided into two other types but in terms of leg movement, which are:

Rising Stem Gate Valve

In this type of valve, the gate moves up to release the flow and down to stop the flow using a clamped stem, which is rotated through the hoop from above inside a clamp in the valve neck. This is considered one of its most important features, which makes maintenance and lubrication easy. We note that the direction of the gate&#;s movement is perpendicular to the Flow path.

The high-stem gate valve is often installed on the intake and exhaust lines of pumps, and on the inside and outside of control valves, switches, coolers and accumulators.

Non-Rising Stem Gate Valve

We find that it does not differ from the Rising Stem Gate Valve except in the work and installation of the parts, because the stop is the one that rises and falls, while the stem is fixed, and only rotates in its position, so it does not go up or go down, and one of the advantages of this type is that it It is used in large sizes of water lines to weigh down the gate and load it onto the thread shaft.

The fixed-stem gate valve is most often installed on cooling water lines, refrigerant inlet lines, condensers, fire water lines, and saltwater lines.

Electric gate valve

It is an electrically powered gate valve that opens and closes quickly and includes a selection of the method of operating the valve, either operation from the control room, on-site operation, or manual operation.

Types of gate valves in terms of use

It is divided into several types, including:-

parallel gate valve

It is a gate with a flat disc that rests on two seats and is connected to the disc by a screw shaft, then connected to a circular handle to enable the user to turn it left and right. In order to close or open the fluid path.

knife gate valve

Its idea is the same as that of the parallel gate valve, but the difference is that the end of the disc is not flat, but rather sharp, in order to cut solid impurities that pass through the fluid into small parts.

gate valve pressure seal bonnet

It is a type of gate valve designed to withstand high pressures exceeding psi.

Features of gate valves

• It features complete opening and closing.
• It is available in different sizes, and there are large sizes.
• Easy to maintain.
• Easy to disassemble and install.
• It can work in two directions.
• Its price is considered appropriate and cheap.

Disadvantages of gate valves:

• It requires muscle force to open or close it in manual cases.
• Vibration occurs when it is partially open.

Materials from which the gate valve is made:

It can be made of several materials, including:-

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• Cast iron.
• Gunmetal.
• Stainless steel.
• Alloy steels.
• Forged steel.

Optimal use of various types of gate valves

Proper handling of gate valves is essential for efficient and safe operation.

Valve installation

When installing brass gate valves, make sure they are properly aligned with the pipeline. Misalignment can cause leaks or operational problems. Tighten the connections securely but avoid overtightening them, which may damage the valve.

Regular inspection

Routine inspection is crucial. Inspect valves for signs of wear, corrosion or damage. Address any issues immediately to prevent operational disruptions.

Lubrication

Lubricate the valve stem regularly to maintain smooth operation. Use a compatible lubricant to prevent excessive friction and extend valve life.

Avoid excessive force

Never use excessive force when operating a brass gate valve. Excessive force can damage valve components and impair its performance.

Corrosion prevention

Brass gate valves are susceptible to corrosion. To prevent this, choose appropriate materials and coatings based on the type of liquid or gas being controlled. Clean and maintain the valve regularly to avoid problems associated with corrosion.

Adjust the appropriate opening and closing position

Make sure the valve is fully open or fully closed when in use. Partially open positions can lead to water hammer, excessive wear, and increased energy consumption.

Temperature considerations

Pay attention to the temperature range. Brass gate valves may not be suitable for extreme temperatures. Make sure the valve you use can handle the specific temperature requirements of your application.

Pressure assessments

Adhere to the valve&#;s recommended pressure ratings. Exceeding these ratings may cause leakage or valve failure. Always choose the right valve for your application.

LED position indication

In applications where valve position is critical, consider using position indicators. This ensures that you are aware of the valve&#;s condition at all times, preventing any unexpected problems.

Emergency shutdown plan

Have a well-defined emergency shutdown plan. This is essential to quickly respond to unexpected situations and prevent damage to your equipment and the environment.

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