How To Choose A High-Pressure Valve?

High-pressure valves play a vital role in the industrial field. Whether in chemical plants, the oil and gas industry, or power stations, high-pressure valves are critical components for ensuring the proper operation of equipment and processes. However, since there are so many different types and specifications of high pressure valves on the market, it can be confusing to choose a high-pressure valve that suits your needs. In this article, we will introduce you to how to choose the right high-pressure valve for you and help you make an informed decision.

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First, Understand the basic types of high-pressure valves and their working principle

before choosing a suitable high-pressure valve, we need to understand the basic types of high-pressure valves. Common high-pressure valves include ball valves, gate valves, globe valves, butterfly valves, etc. Each type of valve] has its specific working principle and applicable scenarios. For example, ball valves are suitable for quickly cutting off fluid flow, while butterfly valves are suitable for large flow control. Knowing about the different types of high-pressure valves will help you be more specific about your needs when choosing.

Second, High-pressure valve material

you need to consider the material of the high-pressure valve. Due to the high pressure and temperature in high-pressure environments, high-pressure valves need to use high-temperature and corrosion-resistant materials. Common materials include stainless steel, carbon steel, alloy steel, etc. According to the specific working environment and fluid medium, selecting suitable materials can ensure the performance and durability of high-pressure valves.

Third, Choose the appropriate size

evaluating the size and specification of high-pressure valves is also an important part of the selection process. High-pressure valves need to be sized to match the piping system to ensure smooth and effective control of fluid flow. When selecting a high-pressure valve, you need to consider factors such as the diameter of the pipe, the pressure rating, and the flow rate of the fluid. Reasonable size and specification selection will help to improve the security and stability of the system.

Finally, High-pressure valve operation mode and maintenance

It is also critical to consider the operation and maintenance of high-pressure valves. The operation mode of the high-pressure valve includes manual operation and automatic operation. Manual operation is suitable for simple switch control, while automatic operation is suitable for scenarios that require remote monitoring and control. In addition, regular maintenance and servicing can prolong the life of high-pressure valves and ensure their proper functioning. Therefore, when choosing a high-pressure valve, you need to consider the operation mode and maintenance requirements and select the type that suits your needs.

To sum up, choosing high-pressure valves that suit your needs to comprehensively consider factors such as valve type, material, size, and specification, as well as operation and maintenance. High-pressure valve performance and reliability can only be ensured by making an informed choice based on your specific needs. I hope this article will help you choose high-pressure valves!

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After identifying possible options, carewater experts conduct a comprehensive evaluation of potential valves. They must study the performance of valves under similar conditions and analyze available data about the valves, including test reports, quality standards, and manufacturers&#; recommendations.

Selecting the appropriate control valve technology doesn't fall into the one-size-fits-all category. The process to be controlled has an influence on the best choice of valve. So too does the level of control accuracy required to meet the needs of the process.

For example, the question should be posed, "How accurate does the control need to be?" Initially, this question sounds a bit silly. Of course, if we're controlling a flow, it should be accurate, right? Well, it may need to be, but on the other hand, it really may not need to be very accurate. The reason this is so important is the accuracy level has a direct correlation to the price tag.

As control packages become more precise and the speed of response increases, the cost typically rises as well. There are certain operations in the field where a more expensive control package is in place than is required based on the level of control needed. Alternatively, there are control packages in operation that don't make the grade based on what's required. How does one know if what they're trying to control dictates a more expensive, more precise approach, or if a less expensive, less accurate option will do a sufficient job? There are several factors that should guide this decision, allowing plant operators to select the best option.
 

The Available Options

A globe control valve is frequently considered the gold standard of control valves (Figure 1). They were the first modern control valves, and over the past century have been refined and modified to work in some of the toughest services. Some form of globe valve will get the job done in almost all cases. They're particularly well suited for high-temperature, high-pressure-drop applications where long, constantly bending flow paths cause continuous loss of pressure and reduced pressure recovery, minimizing noise generation and cavitation.

Globe valves have more severe service options than other valve types, so there are times when nothing, but a globe valve will survive and function properly. They also offer replaceable trim sizes for each line size, allowing an improperly sized valve to be corrected, or letting users start with a reduced-trim valve and change to a larger trim as capacity increases.

However, the inherent design of a globe valve can create drawbacks in some applications. They don't tolerate suspended solids well and can jam and quit working. They also tend to be heavy and physically large, which can be a problem in a system requiring tight packaging. Finally, they also tend to be the most expensive type of valve for a given size.

More recently, quarter-turn or rotary valves have been used in many control applications. These can include a butterfly valve, ball valve, segment valve, or eccentric plug valve. While there were some failures when used in processes where they were applied inappropriately, several decades of progress in materials and design enhancements have greatly increased the range of processes in which quarter-turn valves can be safely used.
 

Quarter-turn valves are not just occasionally acceptable substitutes for globe valves (Figure 2). Rather, they actually outperform globe valves in processes with suspended solids, like pulp stock, sewage, mining slurries, and powder conveying. And all but eccentric-plug valves have higher flow capacities (CV) for a given line size than globe valves, allowing a smaller valve to be used, saving weight and cost.

Butterfly and segment valves (Figure 3) are physically small and light relative to their CV, making pipe design easier than accommodating and supporting a heavier valve. Not coincidentally, they're also less expensive because they require less metal and machining time than globe valves.

What are the areas we need to consider when determining if a valve type is a good fit for a process? Temperature and pressure are two of the most important.
 

Temperature, Pressure, and Steam

When discussing temperature limitations, one must focus on the extremes. If temperature requirements are moderate/mild, many soft-seated rotary valves will do the job. However, once temperatures reach or exceed 400° F, soft-seated valves start to have trouble handling the stress, and a metal-seated valve may be required. A metal-seated valve is typically higher in price. If temperatures approach 800° F, it may make the most sense to recommend a globe control valve.

There are competing factors that can affect the decision-making process regarding pressure. Rotary valves are available with ANSI pressure class ratings of and higher, just as for globe valves. But rotary valves typically generate more noise and are more prone to cavitation if control differential pressures are high. Proper sizing and noise calculations are required to verify a rotary valve will work in a high-pressure system. It's typically easier to find a globe valve for high-pressure and especially high-pressure-drop applications.

However, rotary valves also can have an advantage in high-pressure systems. The required actuator size for a globe valve increases quickly with increasing pressure, even with more expensive balanced designs. Many rotary designs have less increase in required actuator size as pressure increases, saving money and reducing assembly size.
 

Similar to temperature, increasing differential pressure requirements reach a point when it becomes difficult to find a rotary valve that will work. Depending on the process fluid and conditions, this can be at 100-30-psi differential pressure. If there are higher pressure drops across the valve, however, it's likely that a properly designed globe control valve is the only option that will work.

Steam can be worrisome as it tends to do a great job of eroding materials. The characteristics of basic rotary valves are well-suited for air and water but can have problems with steam. You may need to use a special severe-service rotary valve for steam applications with a 50-psi pressure drop or more. High-performance butterfly valves can be remarkably effective for low and medium differential pressure applications and be extremely cost-effective. High differential pressure applications, such as steam turbine power plants, usually require a specially designed and very expensive globe valve.
 

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