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Gate valve is a common type of valve and is widely used in pipeline systems. But some procurement personnel or junior engineers may not have a very detailed understanding of specific valve details. However, the selection of gate valves is crucial, as choosing the wrong valve may result in low operation or leakage of the pipeline system.
This article will provide a detailed introduction to some knowledge about gate valves, including but not limited to their advantages, disadvantages, and differences from other valves.
The main function of gate valves is to provide opening and closing isolation in pipeline systems. Both opening and closing have good performance in terms of pressure drop and sealing. Its pressure level is usually between 150-2500, which is commonly used in high-pressure environments. Gate valves have average performance in regulating flow rate and are often used to regulate flow rate, which may cause seal damage.
What Are the Advantages of Gate Valves?
Gate valves have high sealing performance and high pressure resistance. Therefore, it has high applications in many industries.
Gate valves have relatively low fluid resistance. Because it is designed with a full bore, there will be no resistance when the fluid passes through the valve.
Gate valves also have the ability to provide bi-directional sealing. This ability makes its installation more flexible.
Gate valves are suitable for high-pressure environments. Its high voltage level is between 150 and 2500. Its commonly used specifications are EN 10204 3.1, etc.
The internal structure of gate valves is relatively simple, so their service life is longer than other valves. But regular maintenance should also be carried out.
What Are the Disadvantages of Gate Valves?
The disadvantages of gate valves mainly lie in some operational aspects.
For large gate valves, if there is no gear transmission or actuator assistance in terms of opening and closing, relying solely on manual operation will be somewhat difficult. Because its operating torque is relatively high. Therefore, it is necessary to conduct torque testing during the adjustment phase.
The opening and closing speed of gate valves is slow, which is not suitable for some pipeline systems that require quick opening or closing.
Gate valves are not suitable for adjusting flow rates. If it is in a partially open state, it will damage its sealing surface. Being in this state for a long time will seriously affect its sealing performance.
The installation of gate valves requires a relatively spacious area because they have valve stems and sealing components, which require a large space for both installation and later maintenance.
Where Are Gate Valves Commonly Used?
The main function of a gate valve is to open and close. It is more suitable for some fully circulated or related pipeline systems, but it is also applicable to many industrial fields.
Oil and gas pipeline system
water supply system
Sewage treatment system
Chemical processing system
Power generation facilities
Due to its suitability for high-pressure systems, gate valves will not cause damage in some high-temperature systems. Therefore, its application is still quite extensive.
Why Are Gate Valves Not Suitable for Throttling?
The original design intention of gate valves is to have two states: fully open and fully closed. Therefore, it is not very suitable for throttling.
If the gate valve is in a throttling state, it may cause some problems. For example, damaging the sealing surface can cause some vibration and wear when the fluid passes through its semi open gate plate.
In the case of reduced sealing, there is a risk of leakage. Maintaining it will also increase its cost.
In situations where throttling is required, globe valves are more suitable.
What Is the Difference Between Gate Valve and Ball Valve?
Here are some differences between gate valves and ball valves.
| Feature | Gate Valve | Ball Valve | Globe Valve |
| Function | Isolation | Quick shut-off | Flow regulation |
| Pressure Drop | Low | Very low | High |
| Operation Speed | Slow | Fast | Moderate |
| Sealing | Excellent | Excellent | Good |
| Cost | Moderate | Higher | Moderate |
Understanding the difference between two types of valves, gate valves are mainly used for opening and closing pipelines. Ball valves are more convenient to operate. We can make more suitable choices.
How to Select a Reliable Gate Valve Supplier?
To choose a supplier, the following points must be met first:
Evaluate the manufacturer’s casting ability, high-quality casting technology, and produce valves with higher quality, stronger structure, and better sealing.
Evaluate the manufacturer’s production qualifications and whether they produce according to their standards, as well as some material certifications, including but not limited to EN 10204 3.1.
After production is completed, it is even more important to conduct pressure tests, torque tests, and leakage tests.
Is there a more advanced design available.
Does it comply with the international production title.
If you are purchasing gate valves, choosing manufacturers that meet the above criteria can more effectively reduce risks.
Before making a specific choice, you can request the supplier’s technical data sheet and relevant qualifications.
Summary
The above is an introduction to gate valves. In short, gate valves are suitable for both fully open and fully closed states, and are suitable for high-pressure and high-temperature environments. Of course, for some large gate valves, opening and closing can also be quite troublesome.
After understanding the gate valve, I believe you already have a good understanding of whether you choose this type of valve.
