Basic Structure
- Valve Body: Judging from its appearance, it may be made of ductile iron, carbon steel, or stainless steel, featuring good mechanical strength and corrosion resistance. The black valve body part is probably treated with an anti-corrosion coating to enhance its durability under different working conditions.
- Butterfly Disc: Usually made of materials like stainless steel and alloy, it can withstand the scouring and corrosion of the medium. The design of the butterfly disc is crucial for the flow control and sealing performance of the valve.
- Valve Seat: Common materials include rubber, stainless steel, and cemented carbide. A rubber valve seat has good sealing performance and is suitable for general fluid transportation, while stainless steel or cemented carbide valve seats are applicable to harsh working conditions such as high temperature, high pressure, and strong corrosion.
- Pneumatic Actuator: The component with alternating silver - gray and gray colors at the upper part of the picture is the pneumatic actuator, which is driven by compressed air. It has two types: double - acting and single - acting (spring return). When the air supply is interrupted, the single - acting actuator can automatically reset by relying on the spring, ensuring that the valve stays in a safe preset position. For example, it can automatically close to prevent medium leakage when there is no air supply.
Working Principle
Compressed air is introduced into the pneumatic actuator to drive the piston or diaphragm inside the actuator to move, thereby driving the valve stem and the butterfly disc to rotate. When the butterfly disc rotates to the 0° position, the valve is completely closed, blocking the flow of the medium; when the butterfly disc rotates to 90°, the valve is fully open, and the medium can pass through smoothly. With precise air pressure control, the valve can also be adjusted within a certain opening range to control the flow of the medium.
Performance Features
- High Sealing Performance: High - performance butterfly valves usually adopt a special structural design, such as an eccentric design, so that the sealing specific pressure between the butterfly disc and the valve seat is evenly distributed. It can effectively prevent medium leakage, reach a relatively high sealing level, and meet the needs of industries like gas and chemical engineering that have extremely high requirements for sealing.
- Good Flow Regulation Performance: The relationship between the rotation angle of the butterfly disc and the flow rate is approximately linear, facilitating precise control of the medium flow. It is widely used in occasions that require fine flow regulation, such as HVAC systems and water treatment systems.
- Strong Durability: High - quality materials and advanced manufacturing processes are selected, enabling the valve to withstand frequent opening and closing operations. At the same time, it can maintain stable performance under different temperature, pressure, and medium conditions, prolonging its service life and reducing maintenance costs.
- Fast Response Speed: The pneumatic actuator acts quickly and can complete the opening and closing actions of the valve in a short time, meeting the requirements of automatic control systems for rapid response.
Application Fields
- Water Supply and Drainage Industry: It is used to control the flow and direction of water. For example, it plays an important role in the water delivery pipelines of water plants and the sewage discharge pipelines of sewage treatment plants.
- HVAC Systems: It regulates the flow of air or water, controls environmental parameters such as indoor temperature and humidity, and ensures the efficient operation of the system.
- Petrochemical Industry: It is suitable for the transportation process of petroleum, chemical raw materials, and products. It can precisely control various corrosive, flammable, and explosive media, ensuring the safety and stability of the production process.
- Power Industry: In the steam - water systems and circulating water systems of power plants, it realizes the interception and flow regulation of media such as steam and water.
Maintenance
- Regular Inspection: Regularly check whether the air source pressure of the pneumatic actuator is normal, whether the sealing performance of the valve is good, and whether there is any leakage; check the wear condition of the butterfly disc and the lubrication condition of the valve stem.
- Cleaning: Timely clean the impurities and dirt inside and outside the valve to prevent them from affecting the normal operation and sealing performance of the valve.
- Lubrication: Regularly lubricate the moving parts such as the valve stem to reduce friction and ensure the flexible rotation of the valve.
- Pneumatic Actuator Maintenance: Check whether the seals of the actuator are aged or damaged, and replace them in a timely manner; ensure that accessories such as solenoid valves and filters work properly.
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