Choosing a control valve is challenging even for vetted technicians. To choose the right one, you should possess a basic knowledge of regulation technologies. You also need an understanding of different types of control valves and their applications.
Now, what is a control valve, and what types of valves exist? At Blackhawk Supply, we'll be happy to share what we know!
Keep reading to learn about the technology behind control valves, their categories and types, and their various industrial applications.
The control valve is a power-operated device designed for controlling the flow and pressure of fluids and steam. The degree of regulation (from full capacity to minimal) is based on the signal from a controller.
Control valves are an essential component of industrial control systems. These devices are used to control processes, such as liquid level, pressure, velocity, and temperature, but within the correct operating range. Additionally, they ensure efficient operations and the long-lasting service life of your equipment.
These valves are used in many residential and industrial applications. For example, you can find them in HVAC (heating, ventilation, and air conditioning) systems, unit ventilators, fan coil units, VAV boxes, and various other devices.
All control valves share the same goal (flow, pressure, and temperature control), but they are designed for slightly different applications. The most widespread types of control valves are:
Rotary control (ball and butterfly valves)
Linear control (globe and diaphragm valves)
Three-way control
Self-acting control
Let's look at these control valves and their features in greater detail.
Fluids in the rotary valves (also known as quarter-turn valves) travel through rotated passages in a transverse plug. As the name suggests, they use a rotating closure element to control the flow.
This type of valve is very flexible and is compatible with many adaptive technologies. Most rotary valves are quite compact. At the same time, they work with demanding applications. Their design makes them great for dirty (particle-heavy) fluids, such as those used in refineries.
Ball valves are extremely useful for isolation applications, as they provide straight-through flow. On top of that, they are quick-acting, easily actuated, and offer a low-pressure drop. Ball valves can be operated pneumatically, electrically, and manually (based on their model, of course).
These valves have a rugged three-piece valve body in the form of a quarter-turn valve with a round hole in the center. A ball valve uses a hollow pivoting ball to control how much fluid can flow through it.
Ball valves are pretty heavy and more expensive than other control valves. However, they work great for high-capacity and high-pressure applications. You can find them in:
Building control systems
Water industries
Chemical industries
In addition to hot and chilled water, the ball valve offers excellent control of glycol mixes and steam. Plus, this type of control valve limits cavities and crevices, preventing contamination from outside sources.
Butterfly valves use quarter-turn rotation for control in high-flow applications. The butterfly valves provide a fast and easy way to start and stop the flow. Additionally, it allows for complete closure and opening of the valve, minimizing potential leakage.
These valves are operated pneumatically, manually, or electrically (akin to ball valves). Unlike a ball valve, a butterfly valve is a much more lightweight and economical solution.
Butterfly valves come in different construction materials, liner options, and other specifications. This makes them highly compatible with a wide range of industrial, water, and chemical applications.
Most companies use butterfly valves for their low-pressure drop, high-pressure recovery, and excellent flow isolation. Their typical applications include:
HVAC systems
Exhaust gases control
High-temperature services
Steam services
The plug control valve is a type of valve used to regulate the flow of a fluid in a pipe. It is a type of gate valve, and it consists of a cylindrical plug that slides in and out of the pipe to control the flow. The plug is connected to a stem, which is turned to open and close the valve. The stem is connected to a handle, which is used to operate the plug valve.
The plug valve is used in a variety of applications, including controlling the flow of water in a pipe, regulating the pressure in a pipe, and controlling the flow of oil in a pipeline. It is widely used in the oil and gas and in the food and beverage industries to control the flow of liquids in a pipe.
Linear valves (multi-turn valves) use a sliding-stem mechanism to push the closure into the open and close positions for flow control. This control valve has a slower operation speed but great positional stability and accuracy (1:1 flow control).
Linear valves have a straightforward and durable design. These valves are also very versatile due to a large variety of available trim sizes and options. Some of the most prevalent subtypes of linear valves are globe valves and diaphragm valves.
Globe control valves regulate flow in pipelines and other applications requiring increased flow resistance or significant pressure drops.
These valves have a generally spherical valve body. The mechanism consists of two halves, a moveable plug (disc element) that separates these halves, and a stationary ring seat. In addition, the globe control valve has a stem that regulates the flow by moving up and down in the valve.
The efficiency and reliability of globe valves make them an excellent choice for a wide selection of applications, including:
Chemical feed systems
Boiler and main steam vents
Cooling water systems
Fuel oil systems
Globe valves are pretty expensive devices. However, they provide extended service life, high performance, and optimized flow passages that reduce pressure drops and destructive turbulence.
Diaphragm valves (membrane valves) are typically made of plastic, wood, or metal body with multiple ports and an elastomeric digraph. The seat in the body opens and closes the valve, controlling the flow.
These valves eliminate any chance of contamination due to their tight seal. This helps to ensure the liquids in your systems remain as sterile and clean as possible.
You can use diaphragm valves in many systems, thanks to a wide range of designs and construction material options. In addition to clean water control, you can use these valves to regulate corrosive and abrasive media. You can also use them with pneumatic control heads or process controllers to enhance the accuracy of control.
Three-way control valves are designed to open fluid flow in a pipe while closing the flow in another pipe. These valves typically have a pneumatic, multi-spring, or electric actuator for power.
A three-way flow control valve is available in two configurations: a diverter valve and a mixing valve.
These valves can control water, oil, steam, and various fluids in HVAC systems. The typical applications of the three-way valve include:
Air handling units
Boilers
Fan coils
Water chillers
A mixing valve is designed to control the supply of water in heating and cooling systems. Basically, these devices provide an easy way to mix hot and chilled waters for a comfortable temperature.
A diverter valve is named after a mechanism that opens and closes the valve in combi boilers to regulate water. The typical places where you can find diverter valves include:
Home radiators
Showerheads
Taps
Diverter valves aren't used for standard HVAC systems and conventional boilers. Instead, they are installed in systems that supply heated water on demand.
Some types of valves, like Tee-Piece valves, combine both mixing and diverting functions. They can accept an ON/OFF or modulating signal. These valves can be used in combi boilers, showers, radiators, and regular HVAC systems.
A self-acting valve regulates the water flow with the help of temperature-sensitive fluid. This fluid expands on heating and contracts when cooled. The force created by these reactions transfers to the actuator, which opens and closes the valve.
These valves are used to regulate water and steam in heating and cooling systems. A self-acting control valve's typical applications include:
Air compressors
Air chillers
Boilers
Industrial engines
Some of the advantages of self-acting valves include easy installation and enhanced durability. Plus, these valves are self-sufficient, meaning they don't need an external power supply to operate.
The primary function of all control valves is to regulate the flow, pressure, and temperature of fluids (and other substances). Additionally, control valves can regulate air, steam, glycol mixes, and chemicals based on predefined settings.
Control valves are found in any refining, chemical manufacturing, and other industrial applications. These valves are used for process quantities and consequential control. Now, how do these valves work?
Control valves regulate the flow in loops.
At the start of the loop, a transmitter and a controller compare the current flow level with the desired level.
The controller sends a correction signal to the control device (valve).
The control valve closes to reduce the fluid flow (or opens to increase it).
The valve opens or closes to ensure the desired level of flow.
You can find many control valve types and applications used in various industries. They include food & beverage, oil & gas, pipeline, biopharma, and many others.
As you understand by now, control valves are quite complicated mechanisms. It's not just about choosing the correct type of valve. To ensure you're getting the right valve for your system, you should also consider:
Media type. Your control valve should support the liquid or gas type. For example, metal works for pressure gasses, and corrosive materials require something like PFA or PTFE.
Actuation. Do you want a hand-operated valve or an actuator that turns it off automatically? On top of that, you should consider the positioning of the valve after it loses power. For instance, a double-acting actuator maintains the last position. In contrast, the spring return actuator either opens or closes the valve after losing the signal.
Installation. Consider your management system before choosing a valve. Some types of valves support remote monitoring and control, which can make maintenance much easier. Additionally, find out how easy it is to disconnect and reconnect the valve.
Maintenance. Some valves are virtually maintenance-free, and others require regular cleaning. Needless to say, some control valve types, like ball valves, are way easier to keep clean due to their design.
Now, the list isn't exhaustive. We recommend comparing control valves based on their advantages and disadvantages, functionality, efficiency, and price.
After reading this, you should have a good idea about control valve types and applications. We hope that our guide helps you get the best device for your tasks!
Feel free to check Blackhawk Supply for a great selection of high-grade control valves from reputable manufacturers like Belimo, Johnson Controls, Honeywell, and many others. Our shop has control systems, plumbing supplies, and a ton of other miscellaneous stuff!
The role of control valves in the industrial process loop is becoming increasingly important. As a reliable control valve manufacturer, we would like to introduce the different types of control valves, components, functions, application scenarios, and valve accessories, in a systematic and professional way in this article.
In this section we are going to introduce a piece of brief information about control valves, in case help you to know what control valve is and which role has it played.
As industrial automation processes are upgraded, more and more control valves are being used in process circuits. Almost every plant consists of hundreds of control loops. All loops are in turn networked together and used to keep a number of important process variables within defined limits to ensure the quality of the final product. These parameters include pressure, flow, temperature, level, etc. The sensors and transmitters collect the process variables to the controller, after comparing with the desired setpoints, the controller sends a corrective signal to control valves, in case modulating the valve opening to reach the required value.
In brief, a control valve is a key part of a control loop, a critical control element in industry processes, which consists of a pneumatic actuator, electric actuator, or hydraulic actuator assembly with a valve for regulating the flow capacity or temperature of fluids, or upstream pressure and downstream pressure, or level. It is widely used in petroleum, chemical, pharmaceutical, textile, paper industry, refining, oil and gas, iron and steel metallurgy, and other industries.
process control loopBy now we all know that the most common final control element in the process control industry is the control valve. The ultimate purpose of a control valve is to regulate the temperature, pressure, level or flow of a medium while compensating for load disturbances so that the process variable being regulated is as close to the set value as possible. The medium could be water, steam, oil, gas, or other compounds.
Typically, a control loop consists of a sensor that detects the process parameters, a transmitter, a control valve, and a controller.
The sensor and transmitter collect process variables in the loop and act as an eye to monitor changes in individual parameters such as the temperature, pressure, or level of the medium. The collected value is then sent to the controller. Through the controller, which functions like a brain, the “process variable” received by the transmitter is compared with the “set point” and a corrective signal is sent to the control valve. So the control valve, as the final control element, plays the role of the hand in the control loop, making it the most important part of the automatic control system.
There are many types of control valves, each designed for specific types of applications, read this post for more details on different types of control valves.
globe type control valves – THINKTANKGlobe type control valve is the most common final control element during the process loop, and it gets its name as its spherical shape. According to the ports of the globe valve body, it includes 2-way control, 3-way mixing control, and 3-way diverting type.
globe type control valve drawing Butterfly Type Control ValvesWhen we talk about butterfly control valves, we generally refer to high-performance butterfly valves (double eccentric butterfly valves) and triple eccentric butterfly valves (triple offset butterfly valves).
offset technology for butterfly valvesIn most applications, butterfly valves can replace other types of control valves because they provide the same basic functions, but often have more safety features and better performance. Using butterfly valves in your application can reduce maintenance requirements, improve the accuracy of flow control, and reduce the risk of disasters such as leakage. Butterfly control valves are also used to control water treatment plants because they provide the best seal and can withstand water pressure. Especially in large-diameter pipelines, the use of butterfly control valves is cost-effective.
control butterfly valves type Segmented Ball Type Control ValvesThe v-port or segmented ball is the most common type for ball control valves. Ball valves are widely used in fluid systems in many industries due to their low cost, durability, and excellent closing performance. Similar to butterfly valves, they are not as effective in flow control applications that require high precision and control sensitivity. One of the reasons is that the ball valve requires high torque to open and close, which prevents the operator from making fine adjustments. There is also a certain gap between the stem and the ball, which makes it difficult to find a specific flow rate suitable for fluid control applications.
eccentric plug rotary control valves drawingThe eccentric rotary valve is an innovative technology that combines many of the ruggedness, compactness, and long-stem seal life of globe valves with simplicity and reliability.
eccentric plug pneumatic control valveThe eccentric plug rotary control valves have two offset for construction design. One is the shaft is offset behind the valve seat and the other is the shaft is offset from the centerline of the valve.
eccentric plug valve6When the valve shaft and plug of the eccentric plug control valve start to move, the plug cams away forward open from the seat once the valve just started. There is no friction between the plug and the seat.
The reduced trim full ball valve is the design that has a triangular window on side of the ball.
reduced trim full ball valveThis reduced trim ball valve is not commonly used in initial selection and sizing, most applications are when you find after the plant starts up that a ball control valve is oversized, the capacity is way large than the process required, so if you are not able to alter the piping to accommodate the smaller size valve and the necessary piping reducers, then reduced trim full ball valve is your best choice.
Most of the flow path windows are triangular or V-shaped to get as close as possible to the inherent flow characteristics of EQ%. The wide width of the window determines the maximum flow capacity of the control valve.
There are two major types of control valves, linear and rotary motion. The rotary type control valve is a quarter-turn motion, and the linear type control valve is a sliding motion. So we will separate those two types and list each component for control valves.
Above is a cross-sectional view of a globe type control valve, which clearly shows the main components. globe type control valves can also be called sliding globe type control valves.
Rotary control valves are also known as quarter-turn control valves, and the definition of each part is similar to that of linear type control valves. Only the name of the bonnet is different. The bonnet of almost all rotary valves is cast as a part of the valve body as an entirety and is usually called an “integral bonnet”. Instead, the bonnet is bolted to the valve body as in the case of globe valves.
The part that connects the actuator to the closure element is called a stem by some manufacturers, and a shaft by others.
The closure element of a butterfly valve is called a disc, while a ball valve is called a sphere or ball.
The actuator for the control valve is a mechanical device that uses an external power to modulate valves.
valve actuator symbolsThere are four different types of actuators for the control valve, pneumatic actuator, electric actuator, hydraulic actuator, and self-operated actuator. An actuator is an important component for control valves, which drive to open or close valve. For the industrial process control loop, pneumatic and electric actuated are the most common types.
The pneumatic actuator includes a multi-spring diaphragm pneumatic actuator, single-spring diaphragm pneumatic actuator, sing-acting and double-acting piston/cylinder pneumatic actuator, and rotary type pneumatic actuator(rack&pinion, and scotch yoke).
The multi-spring membrane pneumatic actuators of spring return type are applied for control operation of control valves, and other positioning elements in industrial automatic systems. There are two following design options for the actuator:
multi-spring diaphragm actuator(a) Direct-acting (PZMA)
(b) Reverse-acting (PZMB)
2. Single-Spring Diaphragm Pneumatic Actuator
Diaphragm Actuator 657 Single Spring3. Linear Piston/Cylinder Pneumatic Actuator
linear type pneumatic actuator4. Rotary Type Pneumatic Actuator
rack&pinion pneumatic actuatorscotch yoke pneumatic actuatorWe know that an automated control valve needs an actuator to operate the valve, pneumatic actuator and electric actuator are different, so it may cause confusion when you select an actuator for your application. The following step-by-step method can help you figure out which actuator is exactly perfect for your condition.
Step 1: Check the valve type
Linear type control valve
electric control valves for power plantelectric globe type control valvesLinear type control valve includes globe type, gate type, and pinch valve. The actuator assembly for these control valves must provide linear motion to operation.
control valves manufacturerpneumatic angle type control valves with smart positionerRotary type control valve
The rotary type control valve applies the actuator produces the rotational motion to operate a valve. Eccentric plug valve, butterfly valve, segment ball Valve, and full port ball valve are all categories by rotary type control valve.
electric butterfly control valveseccentric plug valve7shutoff butterfly valveshigh performance butterfly valves1Electric actuators have high levels of precision, control, and energy efficiency. They are usually used for on/off control with fail in the last valve position. And its cost is more expensive than pneumatic rotary actuators.
Pneumatic rotary actuators are known for fewer and simple components, so it makes easier and cheap for maintenance work. Pneumatic actuators with spring return are very commonly used for the failsafe condition, such as FC(fail to close valve) or FO(fail to open valve).
Step 2: Check the available power source on your site
This is a key issue if the site can only provide electric power, not equipped with external air source equipment, in order to save costs, generally use an electric control valve. On the contrary, if equipped with sufficient air supply, then pneumatic control valves are a better option for the process loop.
Pneumatic diaphragm actuators usually required an airpower range of 1.4 bar to 4.5 bar, and piston-type pneumatic actuators required 3 bar to 10 bar power. It’s difficult for plants to guarantee above 6bar at all times for the process equipment, it’s one of the reasons why diaphragm actuators are so commonly assembled for control valves. If low airpower which under 5 bar will require a large size of pistons to generate torque to operate valves.
Piston pneumatic actuators are available in two main types: rack&pinion, and scotch yoke.
Both of these rotary pneumatic actuator types provide a compact and economical solution for quarter-turn(90-degree) full port ball valves, eccentric plug control valves, high-performance butterfly valves, and segment ball valves.
In many plants, electric actuators are commonly available power voltages with 12 and 24 VDC, and 24, 120, and 220 VAC, 1-phase. For power plants, most use 380V, and 400V 3-phase power.
Step 3: Installation Space
control valves for boiler3control valves for boiler6Usually, in complex piping systems, we need to consider the installation space of the control valve, for the narrow installation space, the engineer needs to first consider the compact rotary type control valve, such as eccentric plug control valve, segment ball valve, and butterfly control valve.
Step 4: Function
Most engineering has requirements for actuator function, such as on/off or modulating, service cycle life, failure position, operating speed, control accuracy, assemble with manual operator/handwheel, local control, or others.
We also need to consider the media characteristics if it’s flammable, then pneumatic actuators are safer than electric actuators. So pneumatic actuators are very commonly used in hazardous or explosive working areas, however, any electrical accessories such as limit switch, valve positioner, and solenoid valve assemble for pneumatic actuator still need to meet NEMA standards.
The electric actuator also can be used in hazardous areas, just more expensive than the pneumatic actuator. Just need electrical components and enclosure to meet the NEMA standards.
Step 5: Environmental conditions or ambient temperature
General pneumatic actuators can handle temperature ranges between -4°F to 175°F, due to the piston seal ring, bearing, and mounting design can’t bear high temperatures.
Since low-temperature environments can cause air sources to condense, the condensate may freeze and block the air supply tube, causing the pneumatic actuator to fail to operate.
Electric actuators can be used in the temperature range of -40 to 150°F, but are also affected by ambient temperature and humidity. When used outdoors, electric actuators should be rated for that environment to prevent moisture buildup from damaging electrical components. Also in outdoor low-temperature environments, the heat from the motor can cause condensation to form on the electric actuator housing, so the actuator should be fitted with thermostat accessories or a heater to maintain a constant temperature and avoid the occurrence of condensation issues.
Step 6: Budget
In general, the cost for globe type control valve is higher than rotary type control valve, such as butterfly type and ball type.
electric actuated control valveThe electrical actuator is mounted on the control valve which uses an electromagnetic device converts electrical energy into mechanical movement, it uses an external power source like 220VDC, 24VAC, 380V, or other power voltage to drive valves. Most electrical actuators use limit switches to turn the motor off when the actuator reaches the final valve position, due to it is activated by cams that are mounted on the stem drive shaft.
Electric actuators can be classified as linear and rotary electrical actuators.
The linear electrical actuator also called motorized valve actuator, which commonly used for globe type control valves. For rising stem control valves assemble electric actuators to operate with a screw drive. The closure element of the valve is moved up and down by the rotation of a threaded rod that is connected to the valve stem.
A limit switch for control valves is a device designed to provide a valve position signal to the controller, such as PLC or DCS control system. This accessory can be integral to an electrical actuator and be separately assembled into a pneumatic actuator or valve yoke.
Generally, there are two common types of limit switches used for control valves regarding valve movement.
For sliding stem/linear type control valve, these limit switches are assembled at the valve stem and enable the signal of valve opening or close position to the control system. Some conditions only require one signal of valve closing or opening to the controller, but some require both positions, valve close, and valve open position.
control valve with 2pcs limit switcheslimit switch for control valvesTwo available options:
For rotary type control valves, like ball valve, butterfly valve, and eccentric plug rotary control valve, they use a limit switches box, which has a visual indication of the valve position. The limit switches box is typically activated by cams connected to the shaft and equipped on the pneumatic actuator to the control valve.
pneumatic butterfly valvesLimit switches send electrical feedback from two micro switches to indicate valve position. Typically for on/off type control valve, which confirms either open or close position in site.
Solenoid valve is equipped with pneumatic control globe valves that main function is to lock the valve at the last valve position, and also it can vent out the air from the pneumatic actuator, in case drive valve to the safe position.
I/P transducer means making a current signal 4-20mA converts proportional pressure output of 3-15psi. This accessory is used for an application that does not require a high level of positioner accuracy of a positioner, only needs an electro-pneumatic sensor to transfer the signal.
An air filter regulator is a necessary accessory for the control valve, usually assembly before the actuator, in case the air power reduces the right pressure range for the pneumatic actuator. For example, if the diaphragm pneumatic actuator requires 2.4bar air power, then we need to adjust the air filter regulator to reduce the pressure to meet 2.4bar, otherwise, the air power will damage the diaphragm. Also, it can filter the Impurities in the air.
Volume booster is used for large volume needed pneumatic actuator, the airpower is not enough to provide large air volume in a short time, so in case of speed up the response of control valve, volume booster can provide extra pneumatic thrust output capacity to the valve.
Typically single-acting pneumatic actuators only request one volume booster, and double-acting pneumatic actuators require at least two sets.
Compressed air flows from the control valve and through the quick exhaust valve to the cylinder, speeding up the opening time of the valve.
Sometimes control valve required a positioner transmitter that can send a 4-20mA output signal to control system, in case to feedback a actual valve position.
A manual operator is an additional handwheel for the control valve, in the case of an emergency situation we can operate by a manual operator.
There are three types of manual operators for control valves.
Notes
There are many different types of flow control valves that can be used in a variety of industries. Some valves are complex enough to adjust automatically to pressure and temperature variations, which is why they are called flow control valves. Regardless of their construction, flow control valves are designed to modulate the flow capacity or pressure of fluids, and they respond to signals from flow meters, senses, and transmitters.
Valve TypeTop-Guided Globe ValveCage-Guided Globe ValveFull Port/Segment Ball ValveEccentric Plug Rotary Control ValveHigh-Performance Butterfly BudgetHighHighMedium MediumLowFlow Capacity vs. Globe Control 1x1x2x1x2xCavitation Potential LowLowMedium MediumHighCavitation/Noise Reduction OptionNoYesSomeSomeNoInherent Flow CharacteristicEQ%, Linear, Quick OpeningEQ%, Linear, Quick OpeningEQ%, Quick OpeningModified LinearModified EQ%Suitable for High Pressure DropLimited YesLimitedYesLimitedSuitable for SlurriesLimitedNoYesYesLimitedWeightHighHighMedium MediumLowThe control valve flow coefficient Cv is the flow rate in Gallons Per Minute of 60°F pure water when there is a pressure differential of 1 PSI through the valve at specified travel.
The control valve flow coefficient Cv is the flow rate in Gallons Per Minute of 60°F pure water when there is a pressure differential of 1 PSI through the valve at specified travel.
where:Here are some numbers that show you relatively how much flow capacity will go flowing through the control valve. For example, a control valve with a Cv rate of 100 will go flowing through 250GPM. Under the same process conditions, a Cv of 200 will go flowing through 500GPM, and a Cv of 300 will go flowing through 750GPM.
Cv 100 = 250GPM
Cv 200 = 500GPM
Cv 300 = 750GPM
So we know the bigger of Cv rate, we got the larger the flow capacity. Typically, doubling the size of the valve will increase the Cv about three to four times.
Class IBy agreement between user and supplierClass II0.5% of rated valve capacityClass III0.1% of rated valve capacityClass IV0.01% of rated valve capacityClass V5×10-4 ml per minute water/inch seat dia./psi of pressure differentialClass VIA small number of bubbles per minute depending on seat diameterDuring the selection process of a control valve, we all need to confirm the flow characteristics required for the valve. As a valve manufacturer, we do not know what kind of system this control valve will be installed in (except for the complete solution), so generally, we only provide the inherent flow characteristics which are the relationship between valve opening and flow rate.
In fact, a control valve has two characteristics, one is the inherent flow characteristics, and the other is installed flow characteristics. The end-user is often concerned with the installed flow characteristic which is the relationship between the control valve opening and the flow rate in the particular system being installed.
Cavitation is a very serious problem that could break the control valve performance. The pressure recovery factor of control valve FL represents its tendency to cause cavitation problems. Generally, the higher capacity of rotary valves has a higher recovery factor that has a greater tendency to cavitate. But it doesn’t mean butterfly valves, eccentric plug rotary control valves, segment ball control valves, and other rotary type control valves are not good for modulating function. However, we need to pay more attention that these valves are selected and sized right.
There are many specifications that will tendencies valve cavitation, different valve type has different tendencies, despite they have a low FL but still have a greater potential for cavitation.
cavitation damageIn conclusion, the selection and calculation of control valves need to consider many factors, the above content can not display all the knowledge, but we will continue to update the content as much as possible, at the same time, if you are interested in the calculation formula and sizing information, you can go to our download page for free download.
THINKTANK is a reliable valve manufacturer in China, which focuses on control valves and self-operated pressure regulators. All products are CE, SIL3, and ISO9001-2015 certified, and the quality and service are guaranteed.
We’re based in Taipei of Taiwan since 1993 and offer OEM and ODM services for 42 international brands and deeply cooperate with 35 countries’ valve distributors and engineering.
THINKTANK’s quality, competitive prices, and superior services make it the best valve partner to help you grow your business. We’re qualified with ABB, Siemens, and Bray.
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