Selection Knowledge for Electric Valves and Solenoid Valves

Solenoid Valves: Solenoid valves are typically powered by a 220V instrument power supply for control. Solenoid valves are also considered electric actuators. Both require power to operate and open the valve. However, the difference between electric valves and solenoid valves is that solenoid valves generate an upward force directly upon power application, driving the valve stem. Solenoid valves, after being energized, generate an electromagnetic force that pushes the valve core to open or close. Solenoid valves are widely used in hydraulic and pneumatic control, controlling the state of hydraulic and pneumatic cylinders, and are control components used in oil and gas circuits. Their function is similar to that of contactors in electrical systems.

Electric Valves: Electric valves are typically used for larger pipe diameters and are widely applied in controlling fluid flow, stopping flow rate, pressure, etc. Those used for flow and pressure control are called electric control valves; those used for flow and stop control are called electric shut-off valves. Electric valves generate a higher lifting force than solenoid valves, allowing them to open larger valve diameters. However, electric valves have a disadvantage: they are not resistant to high temperatures. Temperatures above 140 degrees Celsius can easily damage the motor. Similarly, compared to solenoid valves, their sealing performance is also less satisfactory, and they are prone to operational inaccuracies when lifting the valve stem, potentially leading to over-opening or insufficient opening.