COVNA Valves & Actuators For Paper And Pulp

In 2022, the global pulp and paper production is expected to reach 490 million tons, with market size of USD 349.18 billion. Even under the influence of COVID-19, the market size is still growing steadily. More and more FMCG companies are willing to use paper packaging to replace plastic packaging. The paper industry is an industry that meets the needs of environmental protection. Its basic production process is beating, cooking, washing and screening, bleaching and alkali recovery. And the valve plays an important role in every machining process.

Therefore, there will be a high temperature working environment or a corrosive working environment in the pipeline of the paper industry. Then different processing processes have different requirements for pipelines. Therefore, for the selection of pipe materials, valve materials, or other industrial accessories, it is necessary to choose according to the requirements of the corresponding processing technology.

Valves play an important role in every process. It is used to transfer media, such as pulp, bleach, or production wastewater to various processing areas, thereby increasing the capacity of the entire system.

Below, we will introduce the valves that can be used in the paper and pulp industry for your reference, hoping to help you understand valves and choose valves. Any demand for valves, welcome to consult us at

In the beating process, we recommend ball and butterfly valves, their construction is ideal for pipelines that transport fluids with particles and fibers.

In the process of high-temperature cooking, if it is continuous cooking, it is necessary to control the pressure of the cooking tube, the throughput of ingredients and the liquid level value. In this regard, we recommend high-temperature resistant ball valves and butterfly valves that can withstand 180℃. If it is batch cooking, various materials need to be added to the large slurry tank in order and amount. We especially recommend the use of pneumatic control valves to receive feedback signals for precise adjustment of the input of each material.

In the process of washing and screening, it is necessary to remove impurities such as coarse slag and sediment in the coarse pulp. The knife gate valve, which is not prone to clogging, can effectively control parameters such as slurry concentration, slurry flow and slag discharge.

In the process of bleaching, in order to meet the whiteness requirements of the paper, various chemicals need to be added to the natural pulp (black pulp). We recommend corrosion-resistant ball valves and butterfly valves, which can withstand all kinds of strong alkalis and acids, so as to prevent the valves or pipes from being eroded and damaged, which will affect the progress of the project.

In order to ensure the stable production of the alkali recovery process and prolong the service life of the cleaning equipment, it is necessary to effectively and automatically control the concentration and flow of the separated black waste liquid (solid content of 10%). Therefore, we recommend a knife gate valve.

Ball Valve

The ball valve is a quarter-turn valve. Turn the handle 90 degrees to adjust the valve on/off. It can be customized into anti-corrosion type, high-temperature type, high-pressure type, etc. according to the needs of the project to ensure that your project can operate normally. We offer ball valves in manual type, electric type or pneumatic type to fulfill your actuation needs.

Butterfly Valve

The butterfly valve is also a quarter-turn valve. Turn the handle 90 degrees to adjust the valve on/off. It can replace the material of parts, such as seals, valve plates, or valve body materials according to project requirements, to meet your project needs. We offer butterfly valves in manual type, electric type or pneumatic type to fulfill your needs.

Knife Gate Valve

Knife gate valve is not easy to block due to its special structure. It can be used to control the flow and blocking of media containing solids or impurities.
We offer knife gate valves in manual type, electric type or pneumatic type to meet your needs.

Above are the valve recommendations that can be used in the paper and pulp industry. Hope this helps you better understand valves and choose valves based on your project needs.

What Is COVNA Actuated 3-Piece Ball Valve?

The three-piece ball valve is a quarter-turn valve. Turn the handle 90 degrees to drive the ball to rotate, thereby opening or closing the valve. What is special is that this ball valve is composed of 3 parts, which are fixed by screws and bolts. Its advantages are easy disassembly, easy maintenance, long service life, and various connection methods to match various pipeline needs. Including thread, flange, clamp, welding and other connection methods.

3-piece ball valves are available in manual control, electric actuator control and pneumatic actuator control to meet your different actuation needs.

Electric 3-piece ball valve(motorized 3-piece ball valve) means a 3-piece ball valve equipped with an electric actuator. AC/DC power supply, then the electric actuator drive the valve open or close. Lead the labor free. Available in ON/off type, modulating type and intelligent type actuator for your options.

● ON/OFF type actuator for fully open or close.
● Modulating type actuator for regulating the open/close angle of valve from 0 degrees to 90 degrees.
● Intelligent type actuator has the same function as modulating type actuator but it has an LCD display screen.

Modulating type and intelligent type actuator are available in signal control and Bluetooth control to help you control remotely. Also, the electric actuator is available in explosion-proof type, IP68 underwater type, fail-open type and fail-close type to meet various special needs.

Pneumatic 3-piece ball valve means a 3-piece ball valve equipped with a pneumatic actuator. Features include the lowest cost, eco-friendly, and explosion-proof. Available in single-acting (spring return) type and double-acting type actuator.

● Spring return pneumatic actuator means air to open and the valve will auto return once the air is interrupted.
● Double-acting pneumatic actuator means air to open and air to close.

Also, a range of pneumatic accessories is available for you. To help you flow rate control easier and automated.

Applications Of Actuated 3-piece Ball Valve

● Wastewater and water treatment
● Automatic packaging machine
● Brewhouse
● Fish feeding system
● Irrigation
● Food and beverage
● Paper and pulp
And other automatic industries.

Here is the actuated 3-piece ball valve we provided. Hope it could help you know and select. Also we welcome any inquiries from you and we are happy to help you solve the valve problem.

trunnion mounted ball valve

3 Tips For Selecting COVNA Automated Actuators

The automation actuator is a device that facilitates the realization of industrial automation. Automatic actuators and valves are used together in various working conditions to realize remote control and achieve the purpose of flow regulation.

As an experienced actuator manufacturer, COVNA offers a variety of actuators for you to choose from. In this article, we will briefly introduce how to choose an actuator for your reference. Hope that helps you pick the right actuator.

  1. Power Source

According to the power source, actuators can be divided into electric actuators and pneumatic actuators.

● The electric actuator can be driven on and off by DC12V, DC24V, AC24V, AC110V, AC220V, AC380V and other special power sources.

● The pneumatic actuator uses clean air as the power source to drive the opening and closing. At the same time, pneumatic actuators can be divided into spring return type and double-acting types. Single-acting pneumatic actuators are air to open, when air is interrupted the actuator will close. Double-acting pneumatic actuators are air to open and air to close.

  1. Rotation Range

According to rotation range, the actuator can be divided into quarter-turn 90 degrees type and multi-turn 360 degrees type.

● 90 degrees type actuator suitable for the ball valve and butterfly valve.

● 360 degrees type actuator suitable for the gate valve and globe valve. It is also suitable for the ball valve and butterfly valve which need a higher torque to open or close.


  1. Function

Electric actuators have a variety of styles for you to choose from.

● ON/OFF type electric actuator is for opening and closing 90 degrees. Signal control is not accepted.

● Modulating type electric actuator and intelligent type electric actuator is the same function. Both for regulating the open/close angle within 0 to 90 degrees by signal. But intelligent type actuator has an LCD display screen which could help you control and check locally and remotely easier.

● Explosion-proof type actuator, underwater type actuator and auto-return type actuator are available for special applications.

However, a pneumatic actuator is simple. Normally, a pneumatic actuator is just for open/close fully. If you want it to be modulating type or control remotely, we need other accessories to assist. Such as positioner, limit switch, F.R.L and directional control valve.

For more info or inquiries for valve and actuator, feel free to consult us at

2 Guidelines For Selecting The COVNA Automated Valves

Automated valves are the market trend. At present, many industries have begun to use automatic valves to replace manual valves, thereby improving production efficiency, reducing labor costs, and obtaining more profits.
There are many types of automation valves in COVNA company, in this article, we will introduce you to 2 guidelines to help you choose the right valve and actuator.

1. Automated Actuators

The actuator is the most important device in the automatic valve. Actuators can be divided into electric actuators and pneumatic actuators according to the driving source.

Electric actuators are driven by AC/DC power. It can receive and feedback 4-20mA, 1-5V or 0-10V signals, and can be controlled by Bluetooth or manual override helping you to achieve remote control or local control.

Pneumatic actuators are driven by clean air. At the same time, according to the structure, pneumatic actuators can be divided into double-acting types and single-acting types to meet your different actuation requirements. Compared with electric actuators, pneumatic actuators are low-cost.

However, pneumatic actuators need to use other pneumatic accessories to achieve the effect of remote control, such as positioners, F.R.L, limit switches, reversing solenoid valves, etc.

2. Valve

There are ball valves, butterfly valves, gate valves, knife gate valves and globe valves for you to choose from.

Ball valve and butterfly valve belong to the quarter-turn valve. They are suitable for transport, cut-off, changing the flow direction of the medium, regulation, confluence and diversion.

Gate valves, knife gate valves and globe valves are linear valves. Gate valves, as well as knife gate valves, are suitable for starting and stopping the flow. The globe valve is suitable for transport, cut-off and regulation of flow.

Therefore, you can choose the valve according to parameters such as usage, size, pressure, temperature, etc.

As an experienced manufacturer providing high-quality automation solutions for up to 2000+ projects, COVNA will assist you in selecting and providing the right solution to help your project run well.

For more info or inquiries about valve, please contact


Installation Of COVNA Electric Actuator


  • Installation Environment

  1. The product can be installed indoor and outdoor.
  2. The product is non-explosion-proof production, and the installation must be avoided being inflammable or explosive environment.
  3. The electric actuator should be in the protection box in the environment of long-term with the splash of rain, material and direct sunlight.
  4. Please reserve space for controller, manual operation.
  5. The surrounding environment temperature should be in -30℃ to 60℃.

covna electric automatic actuators

  • Temperature Of Working Medium

  1. When matching with the valve, the electric actuator body’s temperature will a bit rise if medium temperature happens heat transfer.
  2. If the temperature or medium is high, the bracket has the function of reducing heat conduction.
  3. Please select the standard bracket if the temperature of the working medium below 60℃.
  4. Please select the standard bracket if the temperature of the working medium above 60℃.
  • Installed On The Valve Body(Figure 3)

  1. Manually operated the actuator to drive the valve, confirm it does not have abnormal situation. Turn the valve in full closed position.
  2. Assemble the bracket to the valve body
  3. Set one end of couplings on valve spindle.
  4. Turn the electric actuator to full closing position, and insert output-input shaft into the square holes of couplings.
  5. Set the screw between the electric actuator and bracket.
  6. Turn actuator by hand shank, confirm that it moves translation, no eccentric, no skew and no overrun.

  • Cable Installation

  1. Install wire tubes as shown in Figure 4
  2. The outside diameter of wire tubes should be ∅9 to ∅11.
  3. Take measures to prevent water.
  4. To prevent actuator from flowing into wire tubes water, the actuation position should higher than wire tubes position.
  5. When installing wire, the outside diameter of wire should be ∅9 to ∅11.
  6. As Figure 5, in case the water flows into actuator interior from line locking, all wire what is not allowed to be used.
  7. The signal wire should be shirlded wire in principle, don’t parallel it to power wire.


  • Special Tips

  1. Caution: Can’t connect one actuator parallel with one another, in other words, can’t use the same controlled contact point to control more than one actuator, otherwise it will cause out of control, motor overhaeting, product damage, shorter service life.
  2. If the actuator is installed outdoor, we suggest equipping other protective cover to prevent water, stabilize mechanical property, make a longer service life.
  • Power Voltage: 220VAC 50Hz/60Hz

  • Guard Line Options For Witch Of Cutting-Off Winding

Item Guard Line Motor Power W/F
05 3A 10
10/16 5A 25,30
30/60 7A 40,90
125/250/400 10A 100,120,14

General Failure and Maintenance Of Electric Actuator

Long-term use of electric actuators, there may happen following 3 issues: Motor Doesn’t Work, The Switch Indicator Doesn’t Work and The Angle Of The Switch Is Constantly Changing.

Failure Phenomenon

Failure Cause

Methods Of Resolution

Motor Doesn’t Work No power Connect the power
Broken wire or the connector is disconnected from the terminal Repair the broken wire, and connect the terminal correctly
Wrong voltage Check the voltage
Overheat protector working(Working temperature too high) Reduce the working environment temperature, use manual control to check whether the valve can be opened properly
Poor action of limit switch Change the switch
Poor capacitance Change teh capacitance
The Switch Indicator Doesn’t Work Light Bulb is broken Change the light bulb
Poor action of limit switch Change the switch
Poor adjustment of the block Adjust it again
The Angle Of The Switch Is Constantly Changing There’s interference from the source Check the signal again
The voltage divider is causing interference Change potentiometer
The gears are loose Check the gears and reinforce the screws on the gears

If you have any issues during using the actuator, COVNA could offer online tech support to help you to solve the problem.


The 13th COVNA Industrial Salon

COVNA Salon is the largest industrial salon in south China. On 21 December 2019, we hosted the 13th Environmental-Industrial Salon and invited 500 companies to share their experience.

First of all, Mr. Ma of Guangdong Water Treatment Technology Association gave a speech and started our 13th Salon Meeting. The COVNA’s Manager Wong introduced the Salon as a “sharing & win-win” event, and invited the event’s organizers and sponsors to take the stage to pay tribute to the 500 companies who have contributed to the environmental industry.

Next, the guests shared their views on the future direction of environmental protection products, and introduced the latest environmental protection products, and put forward the “Made In China to the world” vision. President Hong of COVNA also shared his views on the environmental industry and his knowledge of business management. Each guest shared valuable experiences and suggestions, which were echoed and applauded by the audience.

At the end of the sharing session, guests leave their cards on the signature wall and interact with others to share experiences and seek new business partners.

After the meeting, we went to dinner, ate wine and food, and enjoyed the wonderful performances.

COVNA has hosted 13 COVNA salons since it was first held in 2016. As COVNA’s motto says, “Co-operation, Win-win”, we hope you will be part of COVNA salons in the future! You can learn more about water treatment technology companies in China and more about COVNA’s products here. We Win Together!

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