covna pneumatic actuator valve

9 Advantages Of Pneumatic Actuator Valve

In this article, we will share with you 9 advantages of pneumatic ball valve and pneumatic butterfly valve.

If you are looking for pneumatic ball valve and pneumatic butterfly valve, you should check this article. It could help you to know better and select the valve. At the meanwhile, if you have any demand for this valve, please contact us!

Working Principle And Application Of Pneumatic Ball Valve

Pneumatic ball valve is evolved from the plug valve, with the same rotation of 90 degrees as the plug valve is different from the plug body is a ball, there is around through hole or flow channel through its axis. It works by turning the Spool to open or close the valve.

Pneumatic ball valve switch lightweight, small size, can be made of large diameter, reliable sealing, simple structure, easy maintenance. Sealing surface and spherical surface often in a closed state, not easy to be medium corrosion, has been widely used in a number of industries.

Pneumatic ball valve is mainly used for pipelines, cutting speed, distribution and change the flow direction of media.

Advantages Of Pneumatic Ball Valve

1. The fluid resistance is small, the resistance coefficient is equal to the length of the same pipe section.

2. Simple structure, small size, lightweight.

3. Ball valve sealing surface material is widely used in plastic products, with good sealing performance, widely used in vacuum system.

4. The utility model has the advantages of convenient operation, fast opening and closing speed, and only 90 degrees rotation from full opening to full closing, which is convenient for remote control.

5. Easy maintenance, pneumatic ball valve structure is simple, sealing ring can be moved, easy to remove and replace.

6. When the ball and seat are fully open or closed, the sealing surface of the ball and seat is isolated from the media. Medium through, the valve sealing surface will not wear.

7. Applications range from a few millimeters in diameter to a few meters in size, from high vacuum to high pressure.

8. Pneumatic ball valve power source for gas, generally 0.2 ~ 0.8 MPA pressure, relatively safe. If the pneumatic ball valve leakage, compared with hydraulic, electric, gas can be directly discharged, no pollution to the environment, high safety.

9. Pneumatic ball valves are available in larger sizes than manual and turbo ball valves (manual and turbo ball valves are generally smaller than DN300 and currently pneumatic ball valves can reach DN1200) .

Pneumatic butterfly valve in our life has an important role, is the use of the valve stem rotation with the circular disc to do the opening and closing, in order to achieve the opening action of the main pneumatic valve to do the use of cut-off valve, can also be designed with regulation or section valve and regulation of the function, at present, the use of low-pressure large and medium-sized Pipe Butterfly Valve more and more.

Main Advantages Of Pneumatic Butterfly Valve:

1. Small and lightweight, easy to disassemble and repair, and can be installed in any location.

2. The structure is simple, compact, operation Torque is small, 90 degrees turn on quickly.

3. Flow characteristics to a straight line, good regulation performance.

4. The connection of the butterfly plate and the valve stem adopts the pin-free structure, which overcomes the possible internal leakage point.

5. The outer circle of the butterfly plate adopts spherical shape, which improves the sealing performance and prolongs the service life of the valve, and keeps zero leakage even more than 50,000 times of opening and closing with pressure.

6. Seals can be replaced, and reliable sealing to two-way seal.

7. Butterfly Plate can be based on user requirements spray coating, such as nylon or PTFE class.

8. Pneumatic butterfly valve can be designed as flange connection and clamp connection.

9. The drive mode can be manual, electric or pneumatic.


Advantages Of Electric Actuator

The electric actuator is a valve that is opened and closed by electric power and signal source. It can be controlled remotely or manually. Quarter turn electric actuator, multi-turn electric actuator and linear electric actuator are available.
Widely used in wastewater treatment plants, power plants, HVAC, food plants and various types of systems and pipelines. Electric actuators play an important role in process control automation.

Advantages Of Electric Actuators:

1. Motor Provides High Torque
Electric actuators use single-phase current or three-phase current motors as the main driving force. The torque provided by the motor is large, which can open large-sized valves, and the power consumption is close to 0, which is more suitable for the automation industry. But the motor is easy to accumulate heat and cause downtime. So the overload protection device is very important.

2. Easy To Integrate
Electric actuators provide more and simpler automation solutions than pneumatic actuators. Built-in microprocessor and controller, programmable, can receive signals, can be connected to system control

3. Higher Safety Performance
Optional weatherproof and explosion-proof grades are available. It can provide you with more suitable actuators according to different industries. It can be well applied in harsh environments and reduce the probability of casualties.

4. Lower Cost Of Use
Although the cost of electric actuators alone is higher than pneumatic actuators. However, the electric actuator requires less maintenance, is durable, easy to operate, and has a longer service life. It can be used without any other accessories.

5. Higher Control Accuracy
Due to the large torque provided by the motor, the electric actuator has higher accuracy in controlling motion, and there will be no angular deviation, which makes the media control more precise.

covna motorized valve heating

Advantages Of Electric Ball Valve

In terms of operating efficiency and saving energy consumption, the use of automatic control valves is an indispensable part. The manual valves and pneumatic valves commonly used in the traditional industry are inferior to electric actuator valves in installation cost and efficiency.

The electric actuator valve is driven by power supply and feedback signal to drive the valve switch. It can be controlled manually or remotely. Because the electric actuator valve has the advantages of easy assembly, low failure rate and meeting the industry’s automation needs, it is a more cost-effective choice for the industry. Because of the use of general traditional pneumatic actuator valves, they need to be equipped with air pipes, solenoid valves and compressors. The electric actuator valve is driven by a motor, which is simple and easy to install, and the electric actuator valve can be installed in conjunction with the original automatic control circuit of the factory, which can save other costs. In addition, the motor-driven opening and closing is smooth, without the shortcomings of excessive momentary impulse, and the failure rate can be greatly reduced.

In industrial processes, valves are mostly used to control the travel and flow of various fluids, such as water, oil, chemical liquids, etc., based on parameters such as temperature, pressure and flow. There are several types of control valves commonly used in factories, such as pressure reducing valves, pneumatic thermostats, solenoid valve thermostat systems, proportional control valve thermostat systems, and temperature control valves. When selecting various types of automatic valves, factors such as the type of heat engine, the required accuracy, the quality of the control valve, the pressure drop, the flow rate and its structure, the failure rate, the manufacturer’s credit and after-sales service and other factors should be considered to achieve economic and practical purposes.

Many people think that the electric actuator valve is expensive and the cost of use is high. In fact, if it is calculated as a whole, the traditional valve needs to be installed with many accessories and pipelines. The price is not dominant, but it has to bear more maintenance costs. Electric actuator valves can help your projects to be automated faster, thereby reducing costs and improving work efficiency.

explosion proof electric actuator-1

Advantages Of Explosion-proof Electric Actuator

Explosion-proof electric actuators are used to control valves that rotate from 0 to 270 degrees, such as ball valves and butterfly valves. Widely used in petroleum, chemical industry, water treatment, shipbuilding, paper making, power station and other industries. It uses 380V / 220V power supply as the driving power supply, and uses the switch signal or analog signal as the control signal, which can move the valve to the desired position and realize its automatic control. Excellent sealing performance, less prone to accidents, suitable for explosive and dangerous scenes. And with a hand wheel, you can manually control the switch.

The advantages of explosion-proof electric actuators:
1. Hard aluminum alloy, anodized and polyester powder coating, strong corrosion resistance, protection grade IP67.
2. Fully enclosed squirrel cage click, small size, large torque, built-in overheat protection switch, can prevent the electric actuator from blocking the motor and damaging the motor when it overheats.
3. The design of the hand wheel guarantees safety, reliability, labor saving and small size.
4. There is an indicator on the top of the valve to observe the valve position.
5. The torque switch can provide overload protection. When the valve is stuck, the motor power is automatically disconnected, and the over-torque alarm indication is output, which can effectively protect the valve and the electric actuator from damage.
6. The precise double worm gear mechanism can efficiently transmit large torque, high efficiency, low noise, long life, stable and reliable, and has a self-locking function to prevent inertial transmission and reverse transmission.
7. All screws are made of stainless steel, anti-corrosion, suitable for outdoor use.

All in all, explosion-proof electric actuator will be your best choice of actuator. Wide application range and large torque. Any demand, please leave a message to us!


How To Select Pneumatic Actautor And Electric Actuator?

COVNA is a manufacturer of quarter-turn electric actuator and rack and pinion pneumatic actuator. Any demand, please contact us at

An actuator is a device that opens or closes valves with power drive and signal control for easy industrial automation. The actuator can be driven by voltage, current, or pneumatic, or even manual, and it responds by converting energy into mechanical motion.

Actuators can be used with ball valves, butterfly valves, gate valves, globe valves, knife gate valves and a wide variety of valves used to control or cut off the media. By setting the control signal in advance, the energy source can be automated through the system without the need for an engineer to be there to open it. When working in hazardous or harsh environments, actuators are a good option to reduce labor and casualties.

Actuators can be divided according to the energy drive: electric actuators, pneumatic actuators and hydraulic actuators.

What Is An Electric Actuator?

An electric actuator is an electrical device that converts electrical energy into mechanical torque, providing power to open or close a valve. The main advantages of electric actuators are high stability, High Torque, can work for a long time, through the signal source control (PLC control), adjustable open angle, overload protection functions, self-locking protection functions, and so on.


What Is a Pneumatic Actuator?

Pneumatic actuators are pneumatic devices that convert the origin of compression into a mechanical torque that can quickly open or close a valve. The main advantages of pneumatic actuators are quick response, fast open speed, large load, can adapt to high torque output applications, good adaptability to the working environment.

How To Choose Between The Electric Actuator And Pneumatic Actuator?

1. From the price aspect, the electric actuator’s price is higher than the pneumatic actuator.
2. In terms of opening speed, the pneumatic actuator opens faster than the electric actuator
3. From the installation aspect, the electric actuator needs wiring or the adjustment signal control. Pneumatic actuators require a compressed air system.
4. The electric drive with a servo motor has the advantage when the force increases rapidly and accurate feedback is needed. For applications that require an accurate, synchronous operation, adjustability, and prescribed feedback programming, an electric drive is a better choice, the electric drive system composed of Servo or stepping motor with closed-loop feedback controller can supplement the deficiency of pneumatic system.

The electric actuator and the pneumatic actuator both have the same function, which is to regulate and control the flow of the medium. How you choose depends on the design of your project, as well as the cost estimates.

Please tell us your needs and budget, we will do our best for you to choose the appropriate actuator, to help you save money and effort. Email to


Working Environment of Electric Actuator Valve

Electric Actuator Valve is divided into electric ball valve, electric butterfly valve, electric gate valve and electric globe valve. High Torque, long working hours, low failure rate, easy maintenance, adjustable switching speed / angle, widely used to control the air, water, steam, mud, oil and various corrosive media of the fluid.

Electric Actuator Valve can achieve remote control, PLC control, manual control and so on, its movement process can be controlled by the stroke, torque or the size of axial thrust. Can be used with the different valve body, to replace the implementation of different models to be used in various types of pipelines, suitable for all types of media. Because the electric valve device operating characteristics and utilization depend on the type of valve, device specifications and valve in the pipeline or equipment location. Therefore, the correct choice of electric valve, can effectively prevent the phenomenon of overload, improve cost-effectively.


The electric device in the electric actuator valve is mechanical and electrical equipment, and its working conditions are greatly affected by its working environment. In general, electric actuator valves operate in the following types of environments:

1. With flammable, explosive gas or dust environment.

2. The environment of a ship or dock (salt spray, mold, moisture).

3. Where there is severe vibration.

4. Fire prone situations

5. The environment in Humid and dry tropical regions.

6. The temperature of the pipe medium is over 480 °C

7. Indoors or with protective measures for outdoor use.

8. Outdoor installation, wind, sand, rain, sun and other erosion.

9. Ambient temperature below-20 °C.

10. Susceptibility to flooding or submergence.

The environment with radioactive materials (nuclear power plants and radioactive material test facilities).

For the electric actuator valve in the above environment, the electric device structure, materials and protective measures are different. Therefore, should be based on the above-mentioned working environment to select the appropriate valve electric device.


3 Tips For How To Select The Right Valve

COVNA, as a valve manufacturer over 20 years who specialized in pneumatic actuator, electric actuator, ball valve, butterfly valve, gate valve and globe valve. Any demand, please contact us and we will offer the cost-effective valve solution for you.

In fluid piping systems, the valve is the control element, its main role is to isolate equipment and piping systems, regulate flow, prevent backflow, regulate and discharge pressure. Since it is important to select the most suitable valve for the piping system, it is important to understand the characteristics of the valve and the procedure and basis for selecting the valve.

1.Characteristics Of Valves
Use Characteristics: It determines the main performance and use of the valve, the use of the characteristics of the valve are: Valve Types (closed-circuit Valves, control valves, safety valves, etc.) ; Product Types (gate valves, globe valves, butterfly valves, ball valves, etc.) ; Valve Main Parts Material (body, cover, stem, disc, sealing surface) ; valve drive mode

Structural characteristics: It determines some of the structural characteristics of valve installation, repair, maintenance, etc. , structural characteristics include: The structural length and overall height of the valve, and pipe connection form (flange connection, thread connection, clamp connection, external thread connection, welding end connection, etc.) ; Sealing surface form (insert ring, thread ring, build-up welding, spray welding, valve body) ; Valve stem structure form (rotating rod, lifting rod) and so on.

2.Valve Selection Procedure
1) Specify the use of the valve in the equipment or device and determine the working conditions of the valve: applicable medium, working pressure, working temperature, etc. .
2) Determine the nominal diameter and connection mode of the pipe to the valve: Flange, thread, welding, etc. .
3) Determine how to operate the valve: manually, electrically, electromagnetically, pneumatically or hydraulically, electrically or electrohydraulically.
4) According to the medium of pipeline transportation, working pressure and working temperature, the materials of the shell and inner parts of the selected valve are determined: gray cast iron, malleable cast iron, ductile Iron, carbon steel, alloy steel, stainless acid-resistant steel, copper alloy, etc. .
5) Select the type of valve
6) Determine the type of valve
7) Determine valve parameters: for automatic valves, according to different needs, first determine the allowable flow resistance, discharge capacity, back pressure, and then determine the nominal diameter of the pipeline and valve seat hole diameter.
8) Determine the selected valve geometric parameters: structural length, flange connection type and size, after opening and closing the size of the valve height direction, connecting the size and number of bolt hole, the overall valve shape size. Use The available information: valve product catalog, valve product sample, etc. to select the appropriate valve product.

3. Valve selection basis
1) The use, operating condition and control mode of the valve selected.
2) The nature of the working medium: working pressure, working temperature, corrosion performance, whether it contains solid particles, whether the medium is toxic, whether it is flammable, explosive medium, medium viscosity and so on.
3) Requirements For Valve Fluid Characteristics: flow resistance, discharge capacity, flow characteristics, seal rating, etc. .
4) Installation size and outline size requirements: nominal size, connection with pipe and connection size, outline size or weight limit, etc. .
5) Additional requirements for reliability, service life of valve products and explosion-proof performance of electric installations.


Advantages And Applications Of Ball Valve

If you are looking for a ball valve supplier, you are in the right place. COVNA, a ball valve supplier in China who manufacture electric actuator ball valve, pneumatic actuator ball valve and manual ball valve for various applications. Any demand, please contact

Ball Valve is a valve driven by the stem, and around the ball valve axis for 90-degree rotation movement, can be used for fluid control and regulation. It should be noted that the ball valve needs to be installed horizontally, otherwise it is easy to leak.

According to the connection mode, the ball valve can be divided into: thread ball valve, flange ball valve, clamp ball valve and welding ball valve, can be widely used in a variety of pipelines.

According to the flow pattern can be divided into two-way ball valve, three-way ball valve, and four-way ball valve, can be flexible control in the pipeline medium confluent, shunt, and flow direction switch, but also can close any channel to make the other two channels.

According to the driving form, the ball valve can be divided into electric actuator ball valve, pneumatic actuator ball valve, manual ball valve. Can be based on their own budget, as well as the design of the system, choose the appropriate driver.

Advantages Of Ball Valves

1. The ball valve has the advantages of simple structure, compact design, small volume and light weight
2. Low flow resistance
3. Easy to operate, quick to open and close, only need to rotate 90 degrees to open or close, can be equipped with electric actuator, easy to control from a distance
4. Good sealing performance, using elastic rubber sealing ring, structure easy to seal, not easy to leak
5. Easy maintenance, easy disassembly and cleaning, long working life

 Applications Of Ball Valve

Oil and natural gas transmission main pipeline, need to clean the pipeline, and buried in the underground pipeline, choose all-through, all-welded structure of the ball valve. Pipe buried in the ground, choose all-through welding connection or flange connection of the ball valve. For the transportation pipeline and storage equipment of finished oil, the ball valve with flange connection is selected.

For city gas and natural gas pipelines, flanged and internally threaded floating ball valves shall be used.

In the oxygen pipeline system of metallurgical system, the fixed ball valve with flange connection and strict degreasing treatment should be selected. Low-temperature medium pipeline system and equipment, the appropriate choice with the cover of the low-temperature ball valve.

The lifting rod type ball valve can be used in the pipeline system of FCC unit of oil refining unit.

Chemical systems such as acid and alkali corrosive media devices and pipeline systems, the appropriate choice of stainless steel, polytetrafluoroethylene for the seat sealing ring ball valve.

Metal sealed ball valve can be used in the piping system or device of high temperature medium in metallurgical system, electric power system, petrochemical equipment and city heating system. Need to carry out flow regulation, can choose the worm drive, pneumatic or electric with v-shaped opening regulating ball valve.

Water treatment system can choose the common thread ball valve or flange ball valve, can be equipped with pneumatic or electric actuators, industrial automation, to provide engineering efficiency.


Advantages And Applications of Butterfly Valve

If you are looking for a butterfly valve, you are in the right place. COVNA, a manufacturer of butterfly valve including electric butterfly valve, pneumatic butterfly valve and manual butterfly valve. If you have any demand, please contact

Butterfly Valve is installed in the pipeline, in the pipeline mainly plays the role of cutting and throttling media. Butterfly valve opening and closing piece is a disc-shaped disc, in the valve body around its own axis rotation 90 degrees, to achieve opening and closing or adjustment purposes. Simple structure, can be used with pneumatic actuators and electric actuators, of course, manual butterfly valve also exists. Butterfly valve can be divided into flanged butterfly Valve and clip-on Butterfly Valve according to the connection mode. According to the seals can be divided into soft Seal Butterfly Valve (namely rubber seal butterfly valve) and hard seal butterfly valve.

Advantages of The Butterfly Valve Including:

1 Simple structure, lightweight
2 Small opening and closing Torque, labor-saving, small fluid resistance
3 Large caliber, can transport mud, paper pulp
4 Good sealing performance and adjustment performance
5 The stem is through stem structure, after conditioning treatment, has good comprehensive mechanical properties and corrosion resistance, anti-scratch

Applications Of Butterfly Valve

Butterfly valve is suitable for flow regulation. Due to the butterfly valve in the pipeline pressure loss is relatively large, should also consider the closure of the butterfly plate under pipeline media pressure firmness. In addition, the temperature limitations of the resilient seat material at elevated temperatures must be considered. Butterfly valve structure length and overall height is small, open and close fast, and has good fluid control characteristics, butterfly valve structure principle is most suitable for the production of large-diameter Valves.

In general, in throttling, regulation control and mud medium, the requirements of short structural length, quick opening and closing speed (1/4 Revolution). Low-pressure cut-off (small pressure difference), recommend the selection of Butterfly Valve.

In double-position adjustment, necking channel, low noise, cavitation and gasification phenomenon, a small amount of leakage to the atmosphere, abrasive media, you can choose the butterfly valve.

When using the butterfly valve under special working conditions, such as throttling regulation, strict sealing, severe wear and tear, low temperature (deep cold) and so on, the special designed metal sealing belt regulating device must be used for the special butterfly valve with three eccentric or double eccentric.

The butterfly valve is suitable for the freshwater, sewage, seawater, saltwater, steam, natural gas, food, medicine, oil and all kinds of acid and Alkali and other pipelines which require complete sealing, zero gas leakage, high service life and working temperature of -10 ~ 150°C.

Soft seal eccentric butterfly valve is widely used in gas pipeline and water channel of metallurgy, light industry, electric power and petrochemical industry.

Metal-to-metal wire sealed double eccentric butterfly valve is suitable for city heating, gas, water and other gas, oil, acid and alkali pipelines, as a regulating and throttling device.

Tri-eccentric butterfly valve can be widely used in petroleum, petrochemical, chemical, metallurgical, electric power and other fields besides being used as a program control valve of large PSA gas separation device, it is a good substitute for gate valve and globe valve.