What is a pneumatic butterfly valve?
Pneumatic butterfly valve is composed of pneumatic actuator and butterfly valve. Pneumatic butterfly valve is a pneumatic valve that uses a circular butterfly plate that rotates with the valve stem to open and close to achieve activation. It is mainly used as a cut-off valve. It can also be designed to have the function of regulating or blocking and regulating. Butterfly valves are used in low-pressure applications. Increasingly used on medium diameter pipes.
Pneumatic butterfly valve classification: stainless steel pneumatic butterfly valve, hard seal pneumatic butterfly valve, soft seal pneumatic butterfly valve, carbon steel pneumatic butterfly valve. The main advantages of pneumatic butterfly valves are simple structure, small size, light weight, and low cost. This feature of pneumatic butterfly valves is particularly significant. It is installed in a high-altitude secret passage. It is easy to operate through the control of a two-position five-way solenoid valve, and can also adjust the flow medium.
Basic information of pneumatic butterfly valve:
Application fields: food, chemical industry, petroleum, electric power, etc.
Valve body material: cast iron, carbon steel, stainless steel
Applicable temperature: 10℃～120℃
Pneumatic accessories: solenoid valves, air filters, positioners, signal switches
Functional use: switch cut-off, proportional adjustment, emergency cut-off
Applicable media: liquid, gas, powder and other media
Valve plate material: QT450, WCB, 304, 316L
Nominal diameter: DN50-DN1200mm
Specific classification of pneumatic valves:
Pneumatic flange butterfly valve is composed of rubber seal butterfly valve, carbon steel or stainless steel valve plate and valve stem. It is suitable for regulating flow and intercepting media in water supply, drainage and gas pipelines with temperatures ≤80~120℃ such as food, chemical industry, petroleum, electric power, textile, papermaking, etc.
The pneumatic wafer-type butterfly valve has a novel structure. The valve body is constructed as a short-distance wafer structure to meet the narrow pipeline space. It has zero external leakage and internal leakage in line with national standards.
Pneumatic rubber-lined butterfly valve, the connection method is flange, clamping, the sealing lining is nitrile rubber, ethylene propylene rubber, heat-resistant ethylene propylene rubber, natural rubber, neoprene rubber, fluorine rubber, polytetrafluoroethylene, according to the medium chemistry Properties have more reasonable options.
Pneumatic fluorine-lined butterfly valve, anti-corrosion fluorine-lined butterfly valve adopts a two-piece valve body combination. The valve seat and valve body lining are integrated. When the valve is working, only the full plastic valve seat and plastic-lined butterfly plate are in contact with the medium. The product can withstand Corrosion by any medium “except molten alkali metals and elemental fluorine”, in which the D71F46 valve stem and butterfly plate (forged) are integrated, and the surface is evenly coated with a layer of FEP. The inner surface of the valve body channel is smooth, the fluid resistance is small, the CV value is high, the flow capacity is strong, and the torque is moderate. It adopts a four-level sealing structure and is equipped with an elastic liner valve seat of temperature-resistant and anti-aging SI rubber outside the sealing surface, fully achieving Zero leakage of media.
Pneumatic ventilation butterfly valve features a thin gap between the valve plate and valve seat. This product is suitable for use in environments with poor air circulation.
The main features of the pneumatic telescopic butterfly valve are as follows: novel and reasonable design, unique structure, light weight, easy operation, rapid opening and closing; in addition to regulating and shutting off, and compensating for thermal expansion and contraction caused by the temperature difference in the pipeline, the telescopic butterfly valve also It can provide convenience for installation, replacement and maintenance of valves. The sealing part can be adjusted and replaced, and the sealing performance is reliable.
Advantages of pneumatic butterfly valve:
The main advantages of pneumatic butterfly valves are simple structure, small size, light weight, and low cost. This feature of pneumatic butterfly valves is particularly significant. It is installed in a high-altitude secret passage. It is easy to operate through the control of a two-position five-way solenoid valve, and can also adjust the flow medium.
The fluid resistance is small. When the medium and large diameter pneumatic butterfly valve is fully open, the effective flow area is large, and the opening and closing is quick and labor-saving. The disc lever can be opened and closed by rotating 90 degrees, because the medium force of the butterfly wrench on both sides of the rotating shaft is nearly equal. , and the direction of the generated torque is opposite, so the opening and closing torque is small, and good sealing can be achieved under low pressure;
Butterfly valve sealing materials include nitrile rubber, fluororubber, edible rubber, and are lined with PTFE, so they have good sealing performance. Among them, hard-sealing butterfly valves are soft and hard laminated metal sheets, which have the advantages of metal hard sealing and elastic sealing, regardless of low temperature conditions. Both have excellent sealing performance.
Butterfly valve has the following characteristics:
If a butterfly valve is required to be used as a flow control, the main thing is to select the correct size and type of valve. The structural principle of butterfly valve is especially suitable for making large diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical industry, and water treatment, but are also used in the cooling water system of thermal power stations.
1. Compact and lightweight, easy to disassemble and repair, and can be installed at any location.
2. The structure is simple and compact, the operating torque is small, and the 90° rotation opens quickly.
3. The flow characteristics tend to be linear and the adjustment performance is good.
4. The connection between the butterfly plate and the valve stem adopts a pinless structure, which overcomes possible internal leakage points.
5. The outer circle of the butterfly plate adopts a spherical shape, which improves the sealing performance and extends the service life of the valve. It can maintain zero leakage for more than 50,000 times of opening and closing under pressure.
6. The seals are replaceable and the sealing is reliable and achieves two-way sealing.
7. The butterfly plate can be spray-coated according to user requirements, such as nylon or polytetrafluoroethylene.
8. The valve can be designed for flange connection and wafer connection.
9. The driving mode can be selected from manual, electric or pneumatic.
Features of pneumatic butterfly valve:
Pneumatic actuators are available in double-acting and single-acting (spring return), gear transmission, safe and reliable;
1. Pneumatic butterfly valve has gear-type double pistons, large output torque and small size.
2. The cylinder is made of aluminum gold, which is light in weight and beautiful in appearance.
3. Manual operating mechanisms can be installed on the top and bottom.
4. The rack-type connection can adjust the opening angle and rated flow rate.
5. The butterfly valve actuator can be equipped with electrified signal feedback indication and various accessories to achieve automated operation.
6. IS05211 standard connection provides convenience for product installation and replacement.
7. The adjustable joint screws at both ends allow the standard product to have an adjustable range of ±4° between 0° and 90°. Ensure synchronization accuracy with the valve.
