U-type butterfly valve
The U-type butterfly valve adopts a top-loading structure, which reduces the connecting bolts of the valve body itself under high pressure and large diameter conditions, enhances the reliability of the valve and can overcome the influence of the system's deadweight on the normal operation of the valve.
The butterfly valve, also known as the flap valve, is a simple regulating valve that can be used for the on-off control of low-pressure pipeline media. The butterfly valve refers to a valve whose closing part (valve disc or butterfly plate) is a disc that rotates around the valve axis to achieve opening and closing.
The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays a role of cutting off and throttling on the pipeline. The butterfly valve opening and closing part is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating.
DN50mm-DN300mm
PN1.0MPa-1.6MPa
-29C-300C
A butterfly valve is a valve that uses a disc-type opening and closing member to reciprocate about 90 degree to open, close or adjust the flow of the medium. The butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy and quick to operate, but also has good flow regulation function and closing sealing characteristics at the same time. It is one of the fastest growing valve varieties in the past decade. The use of butterfly valves is very extensive. The variety and quantity of its use are still continuing to expand, and it is developing towards high temperature, high pressure, large diameter, high sealing, long life, excellent adjustment characteristics, and one valve with multiple functions. Its reliability and other performance indicators have reached a high level.
In order to meet the use requirements of industrial applications such as high and low temperatures, strong erosion, and long life, metal-sealed butterfly valves have been greatly developed. With the application of high-temperature resistant, low-temperature resistant, strong corrosion resistant, strong erosion resistant, and high-strength alloy materials in butterfly valves, metal-sealed butterfly valves have been widely used in industrial fields such as high and low temperatures, strong erosion, and long life. Butterfly valves with large diameters (9~750mm), high pressures (42.0MPa), and wide temperature ranges (-196~606C) have appeared, bringing the technology of butterfly valves to a new level.
When the butterfly valve is fully opened, it has a small flow resistance. When it is opened between about 15 degree and 70 degree , it can perform sensitive flow control. Therefore, butterfly valves are widely used in large-diameter regulation fields.
The structural length and overall height of the butterfly valve are small, the opening and closing speeds are fast, and it has good fluid control characteristics. The structural principle of the butterfly valve is most suitable for making large-diameter valves. When the butterfly valve is required to control the flow, the most important thing is to correctly select the specifications and types of the butterfly valve so that it can work properly and effectively.
Generally, in throttling, regulating control and mud media, short structure length, fast opening and closing speed, low pressure cut-off (small pressure difference) are required, and butterfly valves are recommended. Butterfly valves can be used in double-position regulation, reduced-diameter channels, low noise, cavitation and vaporization, small leakage to the atmosphere, and abrasive media. Throttling regulation under special working conditions, or strict sealing, severe wear, low temperature (deep cold) and other working conditions are required.
It is mainly composed of valve body, valve stem, butterfly plate and sealing ring. The valve body is cylindrical, with short axial length and built-in butterfly plate.
1. The butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, rapid switching, 90 degree reciprocating rotation, small driving torque, etc. It is used to cut off, connect and adjust the medium in the pipeline, and has good fluid control characteristics and closing sealing performance.
2. The butterfly valve can transport mud and accumulate the least liquid at the pipe mouth. Under low pressure, a good seal can be achieved. Good adjustment performance.
3. The streamlined design of the butterfly plate makes the fluid resistance loss small, which can be regarded as an energy-saving product.
4. The valve stem is a through-stem structure, which has been tempered and has good comprehensive mechanical properties and corrosion resistance and abrasion resistance. When the butterfly valve is opened and closed, the valve stem only rotates but does not move up and down. The packing of the valve stem is not easy to be damaged and the seal is reliable. It is fixed with the cone pin of the butterfly plate, and the extended end is designed to prevent the valve stem from collapsing when the connection between the valve stem and the butterfly plate is accidentally broken.
5. The connection methods include flange connection, clamp connection, butt welding connection and lug clamp connection. The drive forms include manual, worm gear drive, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuators, which can realize remote control and automatic operation.
1. It is convenient and quick to open and close, labor-saving, and has low fluid resistance, so it can be operated frequently.
2. It has a simple structure, small external dimensions, short structural length, small volume, and light weight, and is suitable for large-diameter valves.
3. It can transport mud, and the liquid is stored at the pipe mouth at a minimum.
4. Under low pressure, it can achieve good sealing. 5. Good adjustment performance.
6. When fully open, the effective flow area of the valve seat channel is large, and the fluid resistance is small.
7. The opening and closing torque is small. Since the butterfly plates on both sides of the rotating shaft are basically affected by the medium, and the direction of the torque is opposite, it is easier to open and close.
8. The sealing surface material is generally made of rubber and plastic, so the low-pressure sealing performance is good.
9. Easy to install. 10. The operation is flexible and labor-saving, and manual, electric, pneumatic, and hydraulic methods can be selected.
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