Butterfly valve development and application introduction

The disadvantage of the rubber-sealed butterfly valve is that when it is used for throttling, cavitation may occur due to improper use, causing the rubber seat to peel and damage. To this end, the international development of metal seal butterfly valve, cavitation area decreases in recent years, China has also developed a metal seal butterfly valve in Japan in recent years also developed cavitation-resistant, low vibration, low noise comb-shaped butterfly valve. General seal seat life under normal circumstances, rubber 15 years - 20 years, 80 years of metal - 90 years. But how to choose correctly according to working conditions. The relationship between the opening of the butterfly valve and the flow rate changes substantially linearly. If it is used to control the flow, its flow characteristics are closely related to the flow resistance of the pipe. For example, the diameters and forms of the valves installed in the two pipes are all the same, while the pipe loss coefficient is different, and the flow difference of the valve will also be very large. If the valve is in a state of large throttling, the back of the valve plate is prone to cavitation, the possibility of damage to the valve, are generally used at 15 °. When the butterfly valve is at the opening degree, the shape of the opening formed by the valve body and the front end of the butterfly valve takes the valve shaft as the center and the two sides form different states. The front end of the butterfly plate on one side moves in the direction of flowing water while the other side flows in the direction of flowing water Therefore, one side of the valve body and the valve plate is formed like a nozzle-shaped opening, the other side is similar to the throttle-shaped opening, the nozzle side than the throttling side of the flow rate is much faster, and throttling side of the valve will produce negative pressure, often There will be a rubber seal off. Butterfly valve operating torque, due to the opening and the valve opening and closing direction of different values, horizontal butterfly valve, especially large-diameter valve, due to the depth of the valve shaft, the difference between the head and the resulting torque can not be ignored. In addition, the valve inlet side of the device elbow, the formation of bias current, the torque will increase. Valve in the middle of the opening, due to the role of water flow torque, the operating mechanism needs self-locking.

Powerful Double-Toothed Roll Crusher

The graded toothed roller crusher is powered by two electric motors, which are decelerated by a reducer and then drive two parallel mounted toothed rollers to rotate in opposite directions. When the material falls between the two rollers of the graded crusher, the material is first screened with spiral teeth or knife shaped teeth. Particles smaller than the discharge particle size directly pass through without crushing, and enter the discharge chute. Under the combined action of vertical stress or shear force, large pieces of material are split by the teeth of the toothed roller Shearing and stretching are broken and discharged from the discharge port.

Advantages of Powerful Double-Toothed Roll Crusher

1. The grading crusher crushes materials by shearing and stretching, resulting in uniform particle size of the product after crushing, with low levels of over particle size and overfilling.

2. The transmission device has a compact structure, flexible operation, low noise, and high safety.

3. Adopting a hydraulic coupling and a "utility model" safety coupling for dual overload protection, it is safe and reliable.

4. Adopting a "utility model" crusher tooth plate, the tooth plates are arranged in a spiral manner, with good wear resistance and long service life.

5. The body adopts a modular design, and the combination of various units is convenient and fast, making it easy to disassemble and transport underground and coal buildings.

6. The overall height is low, suitable for working environments with limited space.

7. According to user requirements, speed sensors and PLC programming can be installed to control the working status of monitoring equipment, achieving remote control.

8. Adopting an automatic oil supply system to extend the service life of bearings and reduce the intensity of daily maintenance work.

Powerful Double-Toothed Roll Crusher,Double Roller Crusher

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