Wafer Explosion -proof Butterfly Valve
What Is An Explosion?
The prerequisite for causing an explosion is that explosive substances must be mixed with oxygen to a certain extent to cause a chemical reaction under appropriate ignition conditions. If the reaction speed exceeds the speed of sound, it is defined as an explosion. Explosive mixtures that have accumulated to a certain extent suddenly explode and cause destructive effects in the form of an explosion wave.
What Is Explosion Proof?
If any one of the above three conditions is restricted from occurring, explosions can be prevented. In many use sites, the presence of explosive substances and oxygen is difficult to avoid, so ignition sources must be limited. Electrical equipment is a potential source of ignition, causing surface temperature to rise, electrostatic discharge or sparks caused by instantaneous current when the machine is running. Electrical equipment is designed to avoid excessive surface temperatures and sparks during operation. Therefore, flameproof electrical equipment does not become a potential source of ignition.
The Usage Principle Of Butterfly Valve
The relationship between the opening of the butterfly valve and the flow rate basically changes in a linear proportion. If it is used to control flow, its flow characteristics are also closely related to the flow resistance of the piping. For example, if two pipelines are equipped with the same valve diameter and form, but the pipeline loss coefficient is different, the flow rate of the valve will be very different.
If the valve is in a state of large throttling amplitude, cavitation is prone to occur on the back of the valve plate, which may damage the valve. It is generally used outside 15°.
When the butterfly valve is in the middle opening, the opening shape formed by the valve body and the front end of the butterfly plate is centered on the valve axis, and the two sides form different states. The front end of the butterfly plate on one side moves in the direction of the flow of water, and the front end of the butterfly plate on the other side moves in the direction of the water flow. Therefore, one side of the valve body and the valve plate form a nozzle-shaped opening, and the other side is similar to a throttle-shaped opening. The flow rate on the nozzle side is much faster than that on the throttle side, and negative pressure will be generated under the valve on the throttle side, often Rubber seals may come off.
The operating torque of a butterfly valve has different values due to different openings and valve opening and closing directions. For horizontal butterfly valves, especially large-diameter valves, the torque generated by the water depth and the head difference between the upper and lower valve shaft cannot be ignored. In addition, when an elbow is installed on the inlet side of the valve, bias flow will occur and the torque will increase. When the valve is at the intermediate opening, the operating mechanism needs to self-lock due to the effect of hydrodynamic torque.
Advantages of butterfly valve
1. Opening and closing is convenient, fast, labor-saving, has small fluid resistance, and can be operated frequently. 2. Simple structure, small size and light weight.
3. It can transport mud with minimal liquid accumulation at the pipe mouth.
4. Under low pressure, good sealing can be achieved.
5. Good adjustment performance.
Disadvantages of butterfly valve
1. The operating pressure and operating temperature range are small.
2. Poor sealing.
Working Principle Diagram Of Electric Butterfly Valve
With the rapid development of my country's industrial manufacturing industry, the demand for valves is also getting higher and higher, especially the use of electric butterfly valves and electric ball valves, which are the most prominent among many valves and are common types in pipelines! As a component used to realize on-off and flow control of pipeline systems, electric butterfly valves are increasingly used in practical applications due to their excellent quality and performance!
According to different connection methods, electric butterfly valves can generally be divided into the most common electric wafer butterfly valves and electric flange butterfly valves. The sealing materials include soft seals (normal temperature and pressure) and hard seals (high temperature and high pressure). The working power supply usually includes: AC220V, AC380V, DC24V, the input signal includes 4~20mA 0~10v and other weak current signals. Finally, according to the control form, it is divided into switch type and regulating type. The switching type plays the role of switch; the regulating type is used to adjust the flow and can accurately It is also a relatively expensive valve to adjust the flow to a thousandth of a degree.
The electric butterfly valve uses electric energy as the driving force. The electric device drives the valve stem, causing the butterfly plate to rotate 90° to open and close the valve. It can also receive 4~20mA or other signals from the industrial automation control system to accurately control the valve opening. , thereby achieving the regulation and control of different process parameters such as flow, temperature, and pressure.
Features Of Butterfly Valve
▼ Simple structure and small size. Due to its compact structure, short structural length, small size and light weight, it is suitable for large diameters.
▼The fluid resistance is small. When fully open, the effective circulation area of the valve seat channel is large, so the fluid resistance is small.
▼ Opening and closing is convenient and fast, the adjustment performance is good, and the butterfly plate rotates 90 degrees. Both opening and closing can be completed. By changing the rotation angle of the butterfly plate, the flow rate can be controlled in stages.
▼ The opening and closing torque is small. Since the butterfly plates on both sides of the rotating shaft are basically equally affected by the medium and the torque is generated in opposite directions, opening and closing is less labor-intensive.
▼ The low-pressure sealing performance is good. The sealing surface materials are generally made of rubber and plastic, so the sealing performance is good. Limited by the material of the sealing ring, the operating pressure and operating temperature range of the butterfly valve is small. However, the operating pressure and operating temperature range of hard-sealed butterfly valves have been greatly improved.
1. When the butterfly valve is fully open, it has small flow resistance. When it is opened between about 15° and 70°, it can perform sensitive flow control. Therefore, butterfly valves are very commonly used in the field of large-diameter adjustment. Since the movement of the butterfly plate of the butterfly valve is wiping, most butterfly valves can be used in media with suspended solid particles. Depending on the strength of the seal, it can also be used for powdery and granular media.
2. Butterfly valve is suitable for flow regulation. Since the pressure loss of butterfly valves in the pipe is relatively large, about three times that of gate valves, when selecting butterfly valves, the impact of pressure loss on the pipeline system should be fully considered, and the strength of the butterfly plate to withstand the pressure of the pipeline medium when closed should also be considered. . In addition, the operating temperature limitations of the elastomeric seat material at elevated temperatures must also be considered.
3. The butterfly valve has a small structural length and overall height, fast opening and closing speed, and good fluid control characteristics. The structural principle of butterfly valve is most suitable for making large diameter valves. When a butterfly valve is required to control flow, the most important thing is to correctly select the specification and type of the butterfly valve so that it can work properly and effectively.
Hot Tags: electric stainless steel sanitary butterfly valve, China, manufacturers, suppliers, factory, buy, price, quotation, Proportional Valve For Water, 220v Butterfly Valve Electric Actuator, Linear Electric Actuator For Rotork, Remote Control Valve Actuator, Controls Electric Actuator For Bernard, High Temperature Globe Valve
