Difference Between Pneumatic Valve And Electric Valve

Pneumatic valve and electric valve are both widely used in the market at present. What is the difference between pneumatic valve and electric valve?
Appearance difference: It is composed of actuator and valve body. The limit switch of electric valve is in the electric device, and the limit switch of pneumatic valve, air source filter and solenoid valve.
Time difference: the pneumatic valve should be switched on and off quickly. The DN50 pneumatic ball valve can be switched on and off in one second. The electric valve is relatively slow to switch on and off, which generally takes 15-30 seconds.
Cost problem: relatively speaking, the cost of electric valve is higher than that of pneumatic valve. If there is air source on the site, it is recommended to use pneumatic valve (generally the air source pressure is 4-6 kg), and the applicability of pneumatic valve on the market is higher than that of electric valve.
Service life problem: the service life of electric valve is generally less than 10000 times, and the service life of pneumatic valve can reach millions of times. (If electric valve wants to achieve more than 100000 times, it can reach about 300000 times unless brushless motor is used, but it can only make gears of 50mm, and it can not be used if it exceeds 50nm. Relatively speaking, it can only be equipped with DN32 caliber ball valve, and butterfly valve can be equipped with DN100 caliber or less).
Waterproof: electric valve is not as waterproof as pneumatic valve, and its own waterproof is not bad. However, some customers do not connect it properly during wiring, which will lead to water leakage, and many electric valves are used outdoors. In the rainy season in the south, excessive temperature difference will produce condensate, too much condensate will cause internal mildew and short circuit, and the circuit board inside will be easily damaged by condensate, Therefore, we recommend that customers who buy electric valves switch on 2-3 times a month without using them. The air cylinder doesn't matter, and the water resistance of the pneumatic valve will be better.
Switch mode: the pneumatic valve is driven by the air source (the air source is from the air compressor). After the air source enters, the valve is closed. When the air is discharged, the valve rod is turned to open. The electric valve is a 90 ° turn switch valve.
Which is the ball valve or butterfly valve?
It is recommended to choose ball valve and ball valve rather than butterfly valve. The ball valve is two-way sealed, and there are sealing gaskets on both sides. Even if one side cannot be sealed, the other side can be sealed. The service life of ball valve is much longer than that of butterfly valve. The butterfly valve (common butterfly valve is one-way, hard seal is two-way and one-way, and most butterfly valves are one-way) is of central line. If it is also DN50 caliber, the cost of ball valve is higher than that of butterfly valve, but the service life is also much higher, The service life of ball valves can generally reach about 150000 times (generally, the service life of ball valves on the market is about 70000-80000 times, the service life of national calibration is about 80000 times, and the service life of national calibration is about 5-8 years). At present, most of the high level ball valves are about 50000 times, and the service life of low platform ball valves will not exceed 20000 times at most. The ball valve is divided into high platform and low platform. The high platform with bracket in the middle and the low platform without bracket. The high platform ball valve has one advantage. If there is leakage in the middle, it can still tighten the screws. The high platform part is also technical.
The center line butterfly valve is relatively simple, that is, the middle plate. The biggest advantage is that it is cheap. Generally, the center line butterfly valve is made of iron, the valve plate is also made of iron, and the seal is made of rubber. Therefore, the cost is low. The butterfly valve cannot be used in high frequency occasions. The service life of the butterfly valve is generally about 7000 to 8000 times, which is lower than that of the ball valve. The butterfly valve has one disadvantage. The center line butterfly valve is one-way sealed, which is sealed by the middle single plate, If the rod in the middle is slightly skewed, its sealing will not be good, and the wear resistance depends on the plate in the middle. When the butterfly valve is fully opened, all the media will wash the butterfly plate in the front. If it is washed for a long time, the butterfly valve will be worn, the sealing will be poor, and the service life will also be reduced. Butterfly valve can be selected unless it is switched on and off several times a year, and ball valve is recommended for other high switching frequency