How to Choose Between a Pneumatic Ball Valve and an Electric Ball Valve?

A pneumatic ball valve is actuated by an air supply (sourced from an air compressor). When air enters, the valve closes; when air is released, the valve stem rotates to open. An electric ball valve operates by a 90° rotation. Both pneumatic and electric ball valves consist of an actuator and a valve body. The valve bodies are identical. The limit switch for an electric ball valve is integrated into the actuator, while the limit switch for a pneumatic ball valve is mounted on the actuator. Pneumatic ball valves also include an air filter and a solenoid valve.

In terms of switching speed, pneumatic valves are faster. A DN50 pneumatic ball valve can open or close in one second, while electric valves are relatively slower, typically requiring 15-30 seconds. Electric valves are generally more expensive than pneumatic valves. If an air supply is available on-site (typically with a pressure of 4-7 kg), pneumatic valves are recommended. Furthermore, pneumatic valves currently have wider applicability than electric valves. Electric valves have a shorter lifespan, generally less than 10,000 cycles, while pneumatic valves can last for millions of cycles.

Electric ball valves are not as waterproof as pneumatic ball valves. While electric ball valves are generally quite waterproof, leaks can occur due to improper wiring by some customers. Many electric valves are used outdoors, and in southern regions during the rainy season, large temperature differences can cause condensation. Excessive condensation can lead to internal mold growth and short circuits, easily damaging the internal circuit boards. Therefore, we recommend that customers who purchase electric valves only power them on 2-3 times a month when not in use. Pneumatic ball valves, on the other hand, have better waterproofing than pneumatic cylinders.