difference-of-gate-valve-globe-valve

Difference Between Gate Valve And Globe Valve

  1. Working Principle Difference Between Globe Valve and Gate Valve

Globe valve in open and closed, is the rising stem, rotating handwheel, hand wheel with the stem together with the rotation and lifting movement. And the gate valve is the rotation of the handwheel so that the stem to do lifting movement, the handwheel itself position unchanged.

Secondly, the gate valve can only be fully open or closed, do the use of cut-off Valve, the gate open and close the travel is very large, open and close time. Globe valve plate motion stroke is small, mainly for flow regulation and cut-off use.

  1. Performance Difference Of Globe Valve And Gate Valve

Cut-off valve can cut off the flow, can also adjust the flow. The fluid resistance of the globe valve is large, when opening and closing is laborious, but the valve plate is short distance from the sealing surface, so the opening and closing time is short.

When the gate valve is fully opened, the flow resistance of the medium in the valve body channel is almost 0. Therefore, the gate valve opens and closes labor-saving, but the gate plate is far away from the sealing surface, opens and closes the time to be long.

  1. Installation Flow Direction Difference Of Globe Valve And Gate Valve

Gate valve for the installation of no flow requirements, the media can be two-way flow. But the globe valve for the installation of strict flow requirements must be identified in accordance with the direction of the valve body installation, that is, top-down.

  1. Globe Valve and Gate Valve Structure Difference

Gate valve has the stem and stem, and cut-off valve has no stem stem stem stem stem.

COVNA manufacture gate valve and globe valve with electric actuator including quarter-turn actuator and multi-turn actuator for choice.

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

food-safe-pneumatic-actuated-valve

What Is Food Safe Valve?

Food Safe Valve is playing a very important role in the medical, food and health industry, especially in the industry which requires high sanitation of Valve, the sanitary valve is more important.

General food safe valves are used for equipment maintenance and replacement in pharmaceutical and food factories, or for the construction of integrated systems. Widely used in wine, vinegar, milk and other liquid accurate flow control.

The valve body is composed of an opening and closing plate, a cover, the main shell and a valve core. An air vent is arranged on the wall of the liquid outlet pipe of the main shell, and one end of the air vent is connected with the air pipe, and the other end is connected with the atmosphere. A pull rod is fixed in the valve core of the product, a spring seat is arranged on the valve core, a spring seat is placed on the spring seat, a through-hole is opened at the top center of the cover of the product, an opening and closing plate is arranged on the cover of the main body, and an opening and closing plate is connected with the pull rod, a handle and a vent plug are fixed on the opening and closing plate. Make the container usually closed, and air isolation, to maintain liquid quality, extended storage time. The required air can be filled at the same time when the liquid is discharged, so that the liquid is discharged smoothly. The valve has the advantages of simple structure, easy manufacture, good sealing performance, convenient operation and clamp connection, which can effectively avoid liquid contact with outside air and prevent pollution.

Food safe valves offer acid, alkali and high temperature resistance. Stainless Steel 304 material or 316L material is used to ensure the highest degree of hygiene.

COVNA manufacture food safe ball valve with electric actuator/pneumatic actuator and food safe butterfly valve with electric actuator/pneumatic actuator. All food safe valves with FDA, CE, ISO certificates.

Model

HK60Q-W Food Safe Electric Actuator Ball Valve
Torque Range 50Nm to 600Nm (442 in-lb to 5309in-lb)
Voltage 12V,24V-DC; 24V,110V,220V,380V-AC
Size Range Φ19 to Φ102
Price

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Model HK60D-W Food Safe Electric Actuated Butterfly Valve
Torque Range 50Nm to 300Nm (442 in-lb to 2654in-lb)
Voltage 12V,24V-DC; 24V,110V,220V,380V-AC
Size Range Φ19 to Φ102
Price Get A Quote Now

 

 

 

Model HK56-W Food Safe Pneumatic Actuated Butterfly Valve
Actuator Type Single Acting(Spring Return) & Double Acting
Air Supply Pressure 2.5 bar to 8 bar
Size Range Φ19 to Φ102
Price Get A Quote Now

 

 

Model HK59D-M Food Safe Butterfly Valve With  Pneumatic Actuator
Actuator Type Single Acting(Spring Return) & Double Acting
Air Supply Pressure 2.5 bar to 8 bar
Size Range Φ19 to Φ102
Price Get A Quote Now
electric-actuator-valve

What Is The Overloading Of Electric Actuator?

Electric actuators have their own special requirements, that is, must be able to limit the torque or axial force. Usually, electric actuators use a torque-limiting coupling. When the specification of the electric actuator is determined, the control Torque is also determined. Generally in the predetermined time and operating temperature, the actuator will not appear overload phenomenon.

However, the electric actuator may be overloaded if:

  1. The power supply voltage is low, the actuator does not get enough power and torque, so that the motor stops rotation.
  2. The torque adjustment error, causes the excessive torque, causes the motor to stop the rotation.
  3. Continuous use, the actuator has not had time to dissipate heat, the motor can withstand the temperature value.
  4. Torque limiting mechanism circuit failure, so that the torque is too large
  5. The high ambient temperature causes the decrease of the heat capacity of the actuator

In general, the protection of an actuator that is overloaded is:

  1. For motor continuous operation or electric operation overload protection, the use of thermostats
  2. Thermal relay is used to protect the motor from blocking
  3. Use Fuses or overcurrent appliances for short circuit accidents

Electric actuators are an essential part of industrial automation. In order to make the project safe and stable operation, it is very important to prevent the electric actuator from load phenomenon.

COVNA manufactures quarter-turn electric actuator with overloading protection. If you interested in, please contact us!

pneumatic-actuatr-valve-with-positioner

Advantages of Intelligent Pneumatic Actuated Valve

The intelligent pneumatic actuated valve mainly refers to the use of pneumatic actuated valve with positioner, through the positioner signal feedback, remote control through programming and accurate flow regulation.

With the increasing demand of industrial automation and the development of science and technology, intelligent pneumatic actuated valve has gradually spread to pipeline control in various industries.

The main advantages of intelligent pneumatic actuated valve are:
1. Fault Diagnosis
Pneumatic actuated valve with positioner and through the signal feedback, can diagnose whether the valve is safe to open or close and whether the valve regulation flow is accurate. Make the management of pneumatic valve more convenient, reduce manpower, reduce expenses.

2. Cut Costs
Using intelligent pneumatic valve can not only change the flow characteristics of pneumatic actuated valve conveniently, but also improve the accuracy of flow regulation. This means buying fewer unnecessary automation parts, simplifying the assembly of engineering or equipment, reducing costs and increasing productivity.

3. Digital Communications
Based on HART communication protocol, the positioner realizes the input signal and the valve signal on the same transmission line. The combination of pneumatic actuated valve, positioner and PID control function module makes the control more timely and faster.

In addition to the intelligent pneumatic valve can remote control valve switch, monitoring and regulating the accuracy of flow, but also to improve the production efficiency, access to greater benefits. It is believed that in the near future, the intelligent pneumatic valve will be widely used.

COVNA, as an actuator and valve manufacturer with 20 year experience. We offer pneumatic actuator ball/butterfly valve and positioner to help your application more automatic and gain more profitable.

electric-actuator-valve

3 Advantages of Electric Actuator Valve

With the increasing demand for automation, the demand for electric actuator valves(electric ball valve and electric butterfly valve) has gradually increased, and gradually replaced the manual valve. Although the cost of electric actuator valve is several times of manual valve, even dozens of times, but because of the unique advantages of electric actuator valve, is still loved by various industries. Next, we will briefly understand the 3 advantages of electric actuator valve.

1.Industrial Automation

By programming and adjusting the signal, the valve can be started or closed remotely by the system. Engineers do not need to be present to open the valve, reducing labor costs. When the engineering environment is worse, the engineer does not have to open the valve on the spot, and the safety of the engineer can be guaranteed.

At the same time, electric valve can work for a long time up to 99 hours to achieve engineering automation, improve production efficiency, speed up the construction of the project.

2.Low Failure Rate

Electric actuator valve with load protection device. When the voltage is too high, or the working time is too long to cause the motor to overheat, the load protection will be turned on. But the motor temperature cooling, then only need to re-turn on the power supply, can be opened again. And because the motor drive mode open and close more smoothly, without the disadvantage of too much instantaneous impulse, the failure rate can be greatly reduced.

3.Safe And Easy Installation

Electric actuator valve to motor-driven, easy to install, only with the factory’s original automatic control line can save installation costs.

Although the cost of electric actuator valve is higher than the cost of manual valve, the benefits of electric actuator valve is several times of manual valve.

If you have any intention to replace the manual valve with electric actuator valve, or are interested in electric actuator valve, please contact us! We are happy to provide you with professional automation solution!

working-principle-of-electric-actuator

Working Principle Of Electric Actuator

An electric actuator is a mechanical device that converts electrical power into torque by means of a motor. It is used for rotary or linear motion. And can be programmed (such as PLC control), through the signal control (4-20mA, 1-5VDC, 0-10VDC) to make the valve opening more automatic, improve production efficiency and work efficiency.

Due to the increasing demand for automation and the development of technology, the demand for electric actuators has also improved a lot, such as safety performance. Electric actuators now have over loading protection, and when the voltage exceeds the required range, or an abnormal overheating occurs, the protection is immediately activated to prevent a failure that could cause the project to suspend and reduce productivity. When the motor is cooled, the switching power supply can be switched on again and the motor can work again.

An electric actuator is a geared motor that can have a variety of voltages and is the primary component that produces torque.
The voltage commonly used in single-phase motors is:
12V, 24V-DC
24V, 110V, 220V-AC
The voltages commonly used for three-phase motors is:
380V AC

At present, the electric actuator is widely used in many fields. They are used with ball valves or butterfly valve in a wide variety of applications including:

· Wastewater treatment
· HAVC
· Food processing
· Pulp and paper
· Irrigation

At COVNA, we are committed to providing quality, professional services to our clients. German technology, follow the ISO quality system, ensure every step of the manufacturing process is error-free, provide high-quality products.
For more information on electric actuators, please contact us.

global-penumatic-actuator-market

Global Pneumatic actuator Market

The pneumatic actuator is powered by compressed gas to drive the valve switch. Because of its low price, high-cost performance, long working time, quick start and other advantages and widely used in various fields to replace the manual valve. For example: power plant, water treatment, equipment, food processing, pulp and paper and so on.

According to the Marketsandmarkets.com, the market for pneumatic actuators is expected to reach $6.2 billion by 2025. The compound growth rate from 2019 to 2025 is 5.3%. Industrial Automation, equipment efficiency, productivity and other factors are driving the growth of the global pneumatic actuator market.

(From: Marketsandmarkets.com)

With the development of technology and the increasing demand for automation in different fields, this is an opportunity for pneumatic actuators.

According to the type can be divided into: 1/4 Turn Pneumatic Actuator and Linear Pneumatic Actuator. Linear actuators are more often used in automation equipment, and 1/4 turn pneumatic actuators are more often used in engineering or equipment, such as water treatment equipment, filter presses, irrigation, and so on.

In 2016, a quarter of the market was dominated by pneumatic actuators. Its compact design and cost-effective advantages, replacing expensive cut-off control valves and other factors will help the industry grow in the coming years.

During the forecast period, the oil and gas field will continue to lead the growth of pneumatic actuators. This area is attracting investment from all over the world, increasing the demand for pneumatic actuators.

Secondly, the Asian region(India, Pakistan) increased demand for electricity, which also stimulated the Asian region’s demand for pneumatic actuators. At the same time, Latin America’s industrial automation is in the development stage. There will be a high demand for pneumatic actuators, especially for food and packaging and transport applications. For actuator manufacturers and distributors, the Asia region and Latin America will be a great opportunity to strengthen their business in these two regions.

covna-electric-ball-valve

Global Electric Actuator Market

According to the Technavio report, the electric actuator market is expected to grow by $994.2 million between 2019 and 2023, with a compound annual growth rate of nearly 7%. Among them, global industrial automation, improving production paths and reducing industrial stoppages are the main factors driving the growth of the global electric actuator market. In other words, high cost-effectiveness and innovative technology will be the future electric actuator manufacturers need to pay attention to the development of the road. Only with the increasing demand for automation and continuous innovation in technology, can a good market share.

Electric actuators are divided into linear, quarter-turn and multi-turn. It can be used in different industries according to the product characteristics. Linear electric actuators are more used in automation equipment, quarter-turn and multi-turn actuators are more used in the industry. Such as water treatment projects, pulp and paper, HVAC, food processing, power plants and so on.

Due to the unique advantages of electric actuators–Easier installation, higher efficiency, in part of the industry has gradually replaced pneumatic & hydraulic actuators, which also makes the demand for electric actuators in recent years.

The electric actuator market has grown in Europe, North America and the Asia Pacific region over the past 5 years, but the Asia Pacific region is expected to grow at its highest annual compound growth rate, according to the report. There are two main reasons:
1. The Asia-pacific region is now developing industries at a high speed, building infrastructure and increasing the demand for actuators.
2. Many countries have moved factories to the Asia-pacific region, boosting demand for actuators.
The Asia-pacific region will be an excellent market for actuator manufacturers.

(From:marketsandmarkets.com)

COVNA as a leading manufacturer of actuators and valves in China. We are committed to innovation, delivering cost-effective products globally and improving the efficiency of the valve industry.