Advantages and disadvantages of gate valves

Overview of gate valves&#;

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Gate valves are one of the most common types of valves in the isolation category. They can be found in every refinery, chemical plant, power station, and industrial production facility, and can be manufactured in sizes ranging from DN6 to . gate valves are chosen for the primary purpose of fluid shutoff. It is for this reason that gate valves are often referred to as "cut-off" or "blocking" valves.

Gate valves are generally used in the fully open or fully closed operation. When fully open, the pressure drop through the gate valve is very small; when fully closed, the pressure sealing performance is very good. Due to the fit of the gate and seat ring, there is almost no leakage when the gate valve is closed. However, in the case of very low back pressure (generally not less than 0.34 bar, 1 bar = 105 Pa), some leakage may occur.

Another advantage of gate valves is that they usually open and close very slowly, a feature that prevents fluid water hammer effects from damaging the piping system.

The main limitation of gate valves is that they cannot be used in throttling conditions. When gate valves are used in dry throttling service, the fluid often has a high flow rate near the seat, which can cause erosion. Also in the partially open state, the gate will swing under the impact of the medium, which will cause damage to the seal. Usually, gate valves are more prone to seat and gate seal surface wear than globe valves, and the repair of such wear is difficult to be accomplished by means of grinding and polishing.

Because the structural characteristics of the gate valve are very suitable for large-scale devices, its application range is expanding, and to high temperature and high-pressure development. The maximum diameter of the gate valve has reached DN, in the ammonia plant has been a large number of high-pressure gate valve PN320, for oil and gas drilling wellhead gate valve working pressure up to 138MPa. manufacturing a high-temperature and high-pressure gate valve is the key to solving the problem of wedging the gate plate due to temperature changes, as well as ensuring its reliable sealing performance. To this end, the gate and seat sealing structure should be studied and improved. Resilient seats and resilient floating seats have begun to be applied to enable the gate valve to achieve inlet sealing, outlet sealing, or double sealing of import and export.

Composition of gate valve&#;

Gate valve, also called the gate valve, mainly consists of the valve body, bonnet, gate, stem, seat and seal packing, and other parts.

The gate valve is the opening and closing member (gate), driven by the valve stem, along the seat (sealing surface) to do a linear movement of the valve. Generally, the gate valve can not be used to regulate the flow, only a cut-off device can be used, either completely open or completely closed. Among the various types of valves, the gate valve is the most widely used one. It is suitable for both normal temperature and pressure conditions, as well as high and low temperature and high and low-pressure conditions, and can be applied to a variety of different media through the selection of different materials.

The advantages of the gate valve:

&#;Small fluid resistance. Gate valve body's internal media channel is straight, the media flow through the gate valve does not change its flow direction, so the fluid resistance is small.

&#; structure length (the distance between the two ends connected to the pipe) is small. As the gate is disc-shaped, is placed vertically in the body of the valve, and the globe valve flap (also disc-shaped) is placed parallel to the body of the valve, so compared with the globe valve, its structure length is smaller. Such as the PN16, and DN150 globe valve, the structure length of 480mm, while the same parameters of the gate valve structure length are only 350mm.

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&#; opening and closing less effort. When opening and closing the gate movement direction is perpendicular to the direction of media flow, while the shut-off valve flap is usually closed in the direction of movement and seated in the opposite direction of media flow, and therefore must overcome the force of the medium. Therefore, compared with the shut-off valve, the opening, and closing of the exposition valve is more labor-saving.

&#; Media flow direction is not restricted. The medium can flow from both sides of the gate valve in any direction through the gate valve and can achieve the purpose of connection or cut off. Easy to install, suitable for the flow direction of the medium may change in the pipeline.

&#; When fully open, the sealing surface is subject to minimal erosion of the working medium.

&#;The structure of the body is relatively simple, and the manufacturing process is good.

Disadvantages of the gate valve:

&#;Sealing surface is easy to produce abrasions. When opening and closing the gate and the valve seat in contact with the relative sliding between the two sealing surfaces, under the action of the medium thrust easy to produce abrasion, thus destroying the sealing performance, and affecting the service life.

&#; more parts, the structure is more complex, manufacturing and maintenance are more difficult, compared with the cost of the globe valve are higher.

&#; shape size and opening height are larger, and the space required for installation is larger.

&#;Generally gate valves have two sealing pairs, which adds some difficulties to processing, grinding, and maintenance.

&#; The operating stroke is large, and the opening and closing time is long. Since the gate needs to be completely lifted to the top of the seat channel when opening, and all the gate needs to fall down to block the seat channel when closing, so the opening and closing stroke of the gate is large, and the opening and closing time is long.

What is a Gate Valve?

Gate valves are a type of valve that is widely used in many different pipeline systems to connect and shut off the flow of the medium. Gate valves are not suitable for regulating the flow of the medium, but they can judge the amount of flow according to the height of the sanitary valve stem. Compared with other types of valves, the gate valve is more versatile and has a wider range of applications for pressure, temperature, and caliber.

What Are the Different Types of Gate Valves?

There are several different types of gate valves that all serve slightly different purposes in fluid, gas, and slurry processing systems. Gate valves are categorized by their internal framework and by valve stem type.

Gate Valve Categories

1. Gate Valve Internal Structure:

Gate valves can have four different styles of the internal framework, mostly differing in the type of sealing plate. The four different structures are edge single gate plate type, elastic gate plate type, double gate plate type, and parallel gate plate type.

2. Gate Valve Stem Stent:

Gate valves can have two different types of valve stems a rising stem gate valve or a non-rising stem gate valve.

What are the advantages and disadvantages of gate valves?

Gate valves are commonly used to control fluids by starting and stopping the medium. They only offer minimal flow regulation, so they are suited to efficiently execute a range of industrial functions. You should consider the pros and cons of gate valves to determine if they&#;re the right fit for your pipeline system. Let&#;s take an in-depth look at the advantages and disadvantages of gate valves below.

The Main Advantages of Gate Valves

1. Gate Valves Have Low Fluid Resistance

The gate valve&#;s body is a straight-through shape that does not alter the flow direction, allowing fluid to pass through the valve (when in the fully open position) with minimal resistance compared to other types of valves.

2. Gate Valves Provide Superior Sealing Performance

Gate valves provide better sealing performance than shut-off valves. The gate valve&#;s opening and closing mechanisms are faster and more convenient than those of the shut-off valve.

3. Gate Valves Have a Wide Application Range

Gate valves are extremely versatile and can be used in applications with mediums like steam, oil, and other media. Plus, gate valves can be used in mediums containing granular solids and with high viscosity. It can also be used as a venting valve and a low vacuum system valve.

4. Gate Valves are Bidirectional

Gate valves have dual flow directions. They&#;re not limited to one-way flow, nor are they subject to the flow directions of the medium. Therefore, gate valves are suitable for use in pipelines where the flow direction may change. Plus, they are easier to install than other more sophisticated types of valves.

The Main Disadvantages of Gate Valves

1. Gate Valves Open & Close Slowly

During the opening process, the valve plate needs to be lifted to the upper part of the valve chamber. During the closing process, the valve plate needs to fall into the valve seat. The distance that the valve plate must move in order to open or close is relatively large, leading to a long opening and closing time. This disadvantage makes gate valves impractical for applications that require rapid actuation.

2. Gate Valves can be Prone to Scratches

The opening and closing processes between the valve plate and the two sealing surfaces of the valve seat can create excess friction that may lead to scratches on the sealing surface. These scratches might seem innocuous, but eventually, they have an impact on the sealing performance and the service life. These damages are not always easy to repair, but gate valves are easy to install and replace.

What are the Applications of Gate Valves?

Gate valves are usually used to shut off fluid flow completely or provide full flow. Gate valves generally operate in either fully closed or fully open positions. Gate valves only have a few parts, which makes them easy to install. The components of gate valves are a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve.
Thank you for reading our article and we hope it can help you better understand the advantages and disadvantages of gate valves. If you want to learn more about sanitary valves, we would like to advise you to visit the Adamant Valves homepage for more information.

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