A Gate Valve and Its Advantages - Weidouli Valves Co.,Ltd.

A gate valve is a wedge disc for opening and closing. The movement direction of the brake is required to be perpendicular to the direction of the fluid. It can be opened and closed completely, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate. Usually, the metal material is sealed and welded to improve the wear resistance. The gate is divided into rigid and elastic gates and is widely used in chemical, petroleum, light industry, hospitals, environmental protection, etc.

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Ⅰ. How does a gate valve work

How does a gate valve work? The opening and closing disc of the gate valve is the wedge disc, which has two sealing surfaces. The most commonly used mode is that the two sealing surfaces of the gate valve form a wedge. The wedge angle depends on the valve parameters, which is usually 5°, and is 2°52' when the medium temperature is not high. The gate of the wedge gate valve can form a whole, which is called a rigid gate. It is possible to manufacture gates that can produce slight deformation so as to improve the manufacturability, and compensate for the deviation of the sealing surface angle during processing. This kind of gate is called an elastic gate. After the gate valve is closed, the sealing surface can only be sealed by the pressure of the medium. In other words, according to the media pressure, the sealing surface of the gate can be pushed into the other side to ensure the sealing of the sealing surface, which is called self-sealing. Most gate valves adopt the method of forced sealing.

Ⅱ. Advantages of gate valves

1. The flow resistance is small. The media channel inside the valve is straight, and the flow resistance is small.

2. It is easier for it to do the opening action. Because compared with the shut-off valve, the movement direction of the gate valve is perpendicular to the direction of the medium flow, whether it is open or closed.

3. High and long opening and closing time. The opening and closing stroke of the gate is relatively large, and the elevator is carried out by screws.

4. Water hammer is not easy to occur.

5. The two sides of the channel are symmetrical, and the medium can flow in any direction from both sides, which is convenient for installation.

6. The structure length (the distance between the two connecting end faces of the system shell) is small.

7. The gate valve has simple body shape, short structure, good manufacturing technology and wide application range.

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8. The gate valve boasts compact structure, good valve rigidity, soft channel, small flow resistance, long sealing surface between stainless steel and hard alloy, long service life, PTFE packing, reliable sealing, light and flexible operation.

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Gate Valve, Type, Advantage and Disadvantage, Applications

Gate valves are widely used for all types of applications and are suitable for both above-ground and underground installation. Not least for underground installations, it is paramount to choose the right type of valve to avoid high replacement costs.

Gate valves are designed for fully open or fully closed service. They are installed in pipelines as isolating valves, and should not be used as a control or regulating valves.

Operation of a gate valve is performed doing an either clockwise to close (CTC) or clockwise to open (CTO) rotating motion of the stem. When operating the valve stem, the gate moves up- or downwards on the threaded part of the stem.

History of a gate valve

The term Gate Valve originated from the words gatan, gap, gasse and gat, and implies a passage with a barrier, which can be hinged on one side, allowing it to be OPENED and CLOSED.

Some of the first known gate valves were used by the Egyptians, Greeks, and Romans when irrigating fields with water. These were simple wooden barriers, but they were well-suited for the requirements of the task.

In the 19th century, intensive development of gate valves moved quickly forward due to their increasing use in industrial operations. Over time the materials involved in their manufacture were improved and modified to suit different applications.

In addition, there were significant improvements in the efficiency of both internal and external sealing methods.

Type of Gate Valve

There is a different type of gate valve, such as:

• Standard
• Wedge Types
• Solid Tapered Wedge
• Solid Pliable Wedge
• Double Disc type
• Bellow Design
• Cryogenic Design
• Knife Plate
• Hulk Plate

Advantages of Gate Valves

• The closing feature is very good.
• These valves can be used both ways in the circuit
• They provide laminar flow, the pressure loss is minimum

Disadvantages of Gate Valves

• They cannot be opened and closed quickly.  To fully open or closed wheel or gearbox actuators, the shaft should be rotated as many as the full open revolution number.  The full open revolution number is equal to the pitch
• Assembly, start-up, and maintenance require large space.
• In the fully closed position, the slow movement of the slide causes high flow speed.  Due to vibration and collision, abrasion and deformation occur in the seating surfaces and the surface gets damaged from friction.
• In systems where high-temperature changes irregularly, due to the load in the pipe at the valve end, leakages in gate valves occur.
• At the place of operation, repair and maintenance of seating surfaces are difficult.

Application of Gate valve

• Socket or butt-welding end-gate valves in air, fuel gas, feedwater, steam, lube oil, and other systems are typical applications. Threaded-end gate valves may be used in air, gaseous, or liquid systems.
• Concern for leakage from threaded connection can be addressed by seal welding the threaded connection or by using thread sealants, as appropriate. In low-pressure and low-temperature systems such as fire protection systems’ water piping or water distribution pipelines, flanged gate valves are commonly used.

Refrences:

https://www.avkvalves.eu

http://www.schuf.de

http://www.pipingguide.net

https://www.ksb.com

 

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