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, and 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.


What Is Motorized Valve?

Compared with the solenoid valve, the motorized valve is more reliable, safe and can replace the solenoid valve. In this article, we will introduce you in detail that the solenoid valve and motorized valve principle of the difference and different applications.

If you have any demand for motorized valve or solenoid valve, please contact

How the Solenoid Valve Works:

Solenoid valve is composed of the solenoid coil, spool and valve body. When the solenoid coil power or power off, it will drive spool action, make fluid through the valve body or be cut off. The solenoid valve can only play the role of open or closed.

Applications Of Solenoid Valve:

Solenoid valve is driven by solenoid coil, the driving force is small, more easily damaged by voltage impact, generally suitable for less than DN50 and below the pipeline, switching time is short, and there is a special high-frequency solenoid valve, the utility model is especially suitable for the pipeline with high operating frequency or short switching time, and when the power cut can be automatically reset.

Solenoid valve is suitable for a wide range of media, acid, lye, water, gas, oil, steam and other media can be used. But for the medium viscosity, cleaning degree has high requirements, in the installation of solenoid valve before the installation of a filter to be installed, to ensure the normal operation of the solenoid valve, low leakage rate, high security.

Widely used in ventilator machines, car wash systems, fountain systems, and other applications.

How Motorized Valve Works:

Motorized Valve is a power supply to drive the motor rotation, thus opening or closing the valve of a device, and withstand voltage shocks. The rotating range of the electric valve is adjustable. The rotating range can be adjusted by inputting the specified current and voltage signals. The general control signals are current signal (4 to 20mA) or voltage signal (0 to 5V, 1 to 5V).

Applications Of Motorized Valve:

The driving force of the motorized valve is large, and it can control the large diameter valve, such as globe valve, gate valve, etc., the utility model is especially suitable for large diameter pipelines or places where the flow of pipelines is required to be regulated.

Motorized valve is applicable to a wide range of media, water, oil, gas, steam, acid, alkali and other media can be applied. Driving force can control large-diameter valves, and motorized valves can adjust the flow of the pipeline, especially suitable for large-diameter pipelines or require the use of pipeline flow regulation.

Motorized valves can also be programmed, with the use of PLC remote control, so when the working environment is more harsh or remote circumstances, we recommend using motorized valve. Widely used in HVAC, smart irrigation systems, water filter equipment, paper & pulp.


12 Tips Of Installation Pneumatic Butterfly Valve

Pneumatic actuated butterfly valves are widely used in various industries because of their large size range, low price, stable operation, such as water filtration equipment, irrigation systems, etc. , can effectively control or cut off fluid flow. This article will give you a brief introduction to the installation of pneumatic actuated butterfly valve. If you have any questions during the installation process, please feel free to consult us at

Steps To Install Pneumatic Actuated Butterfly Valve

1. Before installation, check all parts of the pneumatic butterfly valve without missing, model no error, check the body without debris, solenoid valve and silencer without blocking

2. Close both the valve and the pneumatic actuator.

3. Install the pneumatic actuator on the valve (either parallel or perpendicular to the valve body) and see if the screw holes are aligned so that there is not too much deviation. If there is a small deviation, adjust the actuator rotation, then tighten the screws.

4. After installation, the Pneumatic Butterfly Valve is debugged (normal air supply pressure is 0.4 to 0.6 MPa) , and the solenoid valve must be opened and closed manually during commissioning (manual operation can be effective only after losing power to the solenoid valve coil) , observe the opening and closing of pneumatic butterfly valve. If during commissioning the valve is found to have some difficulty at the beginning of the opening and closing process, after that it is normal, it is necessary to adjust the actuator stroke small (The actuator at both ends of the stroke adjustment screw to adjust the same point, to adjust the valve to open position, and then turn off the air source resetting), until the valve open and close smooth and no leakage. Also note that the adjustable silencer can adjust the valve opening and closing speed, but not too small, or may cause the valve not to move.

5. Keep the working environment dry.

6. Check the pipe before installing the butterfly valve to make sure there is no foreign matter in the pipe

7. Select the matching toque of a pneumatic actuator.

8. Make sure that the flanges used for butterfly valve are of the correct specification and that the pipe-to-pipe flanges are in accordance with the standard of butterfly valve flanges. It is recommended to Use Butterfly Valve special flanges. Flat welding flanges are not allowed.

9. Make sure the flanges are properly welded and do not reweld the flange after the butterfly valve is installed. To avoid scalding the rubber parts.

10. Line up the pipe flange and align it with the butterfly valve.

11. Install all flange bolts and tighten by hand to make sure the butterfly valve is aligned with flange, then carefully open and close the butterfly valve to ensure a flexible opening and closing.

12. Fully open the valve, and wrench in accordance with the diagonal order to tighten the bolts, without washers, do not tighten the bolts to prevent serious deformation of the valve ring, opening and closing torque is too large.

COVNA, as a pneumatic butterfly valve manufacturer. We will assemble in accordance with your technical requirements prior to shipment. If in the process of using have any problems, please feel free to contact us!



How To Choose The Right Valve?

When selecting a valve, we consider the direction of the medium, the type of medium, and the function of the valve. Below, we will explain how to select a valve in four ways.

1.Valves For Cut-Off And Circulation Media

Flow channel for straight-through valve, commonly used are butterfly valve, ball valve, gate valve and so on. With low flow resistance, these valves are often used as cut-off and circulation media. But because of its winding flow path, the flow resistance is higher than other valves. So when allowing a higher flow resistance of the occasion, such as the media for gas, you can choose the cut-off Valve.

In the choice of butterfly valve, when the medium has more impurities, such as the medium for sewage, should choose horizontal butterfly valve, the valve shaft for horizontal direction, channel bottom is not easy to accumulate debris and scale, to protect the valve plate sealing ring.

3 piece electric actuator ball valve






2. Flow Control Valves

Normally we would recommend the control valve for flow control purposes, also the globe valve is suitable for this purpose. Butterfly valve, ball valve and diaphragm valves can also be used for regulating flow control, but only in a limited valve size range.






3. Diverter Valve

3-way or 4-way ball valves are generally recommended for reverse shunting. This type of valve is divided into t-type and l-type, can effectively achieve the role of medium flow diversion.






4. Media With Suspended Particles

When the medium with suspended particles, the most suitable for the use of closed parts along the sealing surface of the sliding with the role of wiping the valve. Ball and plug valves are recommended. Because these 2 types of valves in the opening and closing process, the sealing surface has the role of wiping, it is suitable for use in the medium with suspended particles.

COVNA manufacture ball valve, butterfly valve, gate valve and globe valve which have ISO5211 platform which suitable for electric actuator and pneumatic actuator to achieve the purpose of industrial automation.

Any demand, please contact us!


How To Choose Electric Actuator Valve?

With the development of industrial automation, more and more electric actuator valves are used, and the technical requirements for electric actuated valves are becoming higher and higher.

When we are in the choice of electric actuated valve, electric actuated valve control should be considered. According to our engineering requirements, determine whether to use centralized control mode, single control mode, whether it needs to interact with other equipment, manually control, remote control, and so on. We should determine a good control mode at first, confirm technical requirements, and then according to the requirements of the selection and purchase of electric actuated valve.

In addition, in the purchase of electric actuator valves, should consider the need to buy a controller. The controller is more convenient and simple than manual programming. According to their own needs, the need to choose whether the controller.

At present, the purpose of selecting electric actuator valve is not only to open or close the valve, but also to save manpower and improve production efficiency. Therefore, the selection of the appropriate valve, the appropriate electric actuator for the operation of the project is particularly important.

Therefore, the correct choice of electric actuated valve to ensure the normal operation of pipeline engineering is one of the important conditions. If the use of inappropriate valves, not only will not play the greatest role in the valve, more likely to let the project stagnation, resulting in cost losses. Therefore, in the choice of electric actuated valve, we should pay attention to pipeline parameters, but also pay attention to the working environment conditions.

Generally, electric actuator valves are recommended when working in the following conditions:
1. Indoors or with protective measures for outdoor use.
2. Installed in the open air, with rain, rain, sun and other erosion
3. Environment with flammable and explosive gas (recommended use of explosion-proof electric actuators).
4. It is the environment of the Tropics and the dry tropic.s
5. The occasion with violent vibration.
For the above-mentioned environment, electric actuated valve will be in accordance with different working environment with different structure and protective measures. Electric actuated valves are therefore recommended for efficiency and cost reasons.

At the same time, COVNA can provide weatherproof, explosion-proof, sealed electric actuator ball valves and electric actuator butterfly valve for you to choose from. We hope to be able to help you solve any problem, and provide a professional one-stop solution to assist your living up.

If you have any demand, please do not hesitate to contact us!