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What are the precautions for comparing electric valves with traditional valves

by:Sino Valves     2021-02-28
Leading electric valve products include: electric gate valves, electric ball valves, electric butterfly valves, electric shut-off valves, electric regulating valves, small electric actuators, linear electric actuators, quarter-turn electric actuators, 381 electric actuators, multi-turn valve electric devices , Part-turn valve electric device, LQ valve electric device and other series of products. Many customers think that electric valves are expensive and costly to use. In fact, it is not. If calculated as a whole, traditional valves have to be installed with many accessories and pipelines. The price is not dominant, but more maintenance costs. As far as electric valves are concerned, because they have the advantages of easy assembly, low failure rate and meeting the industry's automation needs, they are a more cost-effective choice for the industry. Because the general traditional pneumatic valve is used, it is inevitable to have piping, solenoid valve and compressor to match, and the electric valve is driven by a motor, which is easy to install and hassle-free, and the electric valve can be installed with the original automatic control circuit of the factory, which can save other the costing payment. In addition, the motor-driven opening and closing is smoother, without the shortcomings of excessive instantaneous impulse, and the failure rate can be greatly reduced. Relevant people in the industry said that valves are mostly used in industrial processes to control the travel and flow of various fluids, such as water, oil, and chemical liquids, based on parameters such as temperature, pressure and flow. The control valves commonly used in factories include pressure reducing valves, pneumatic constant temperature valves, solenoid valve constant temperature systems, proportional control valve constant temperature systems, and temperature control valves. When selecting various types of automatic valves, consideration should be given to factors such as the type of heat engine, the required accuracy, the quality of the control valve, the pressure drop, the flow rate and its structure, the failure rate, the credit of the manufacturer, and the after-sales service to achieve economical and practical purposes. What are the precautions for comparing electric valves with traditional valves? 1. When starting, confirm that the clutch handle is in the corresponding position. 2. If the electric valve is controlled in the control room, turn the switch to the REMOTE position, and then control the electric valve switch through the SCADA system. 3. If it is manually controlled, turn the switch in the LOCAL position, and operate the switch of the electric valve on the spot. When the electric valve is opened or closed, it will automatically stop working, and finally turn the operation switch to the middle position. 4. When the valve is operated on site, the valve opening and closing instructions and the operation of the valve stem should be monitored, and the valve opening and closing degree should meet the requirements. 5. When using on-site operation to fully close the valve, before the valve is closed in place, stop the electric valve closing, and use micro-motion to close the valve in place. 6. For the tuned valve of the stroke and super torque controller, when the valve is fully opened or fully closed for the first time, attention should be paid to monitor its control of the stroke. If the valve is switched to the position and does not stop, it should be manually emergency shutdown immediately. 7. In the process of opening and closing the valve, if there is an error in the signal indicator or the valve makes an abnormal noise, the machine should be shut down for inspection in time. 1. Electric valves use motors as power, pneumatic valves use compressed air as power. (1) Advantages of electric valve: It has good effect on liquid medium and large pipe diameter gas, and is not affected by climate. Not affected by air pressure. The disadvantages are: high cost and not good in a humid environment. (2) Advantages of pneumatic valves: good effect on gaseous media and small-diameter liquids, low cost and easy maintenance. The disadvantages are: Affected by the pressure fluctuation of the air pressure, in the northern winter, it is easy to be affected by the water content of the air pressure, causing the transmission part to freeze and not move. Second, pneumatics are generally faster than electrics, and electrics are generally dual-purpose flashlights. Pneumatic valves require both hands and pneumatics. The price is generally higher. 3. Electric valves are used in places with large pipe diameters, because pneumatic valves are difficult to achieve, but electric valves are not as stable as pneumatic valves, their switching speed is slow, and the actuator runs for a long time. There will be a jam phenomenon. Pneumatic valves have fast switching speed and high precision, but they need a stable air source. Four. There are not many brands of electric valves that can be explosion-proof; the price of explosion-proof pneumatic valves is relatively lower than that of electric valves. When electric valves are used for interlocking valves, 1. The local weather and climate are relatively humid, so pneumatic valves cannot be used because the air source is likely to carry water. 2. The electric valve realizes the power-off and position-preserving interlock without additional cost, and the pneumatic valve needs to increase the position-preserving valve, which increases the cost.   
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