There are differences between electric valves and pneumatic valves in terms of power source, control performance, applicable scenarios, maintenance costs, etc., as follows:

1. * * Power source**

-Electric valve: It uses an electric motor as a power source to drive the opening and closing of the valve. Electric motors usually use mains or other DC power sources, and as long as there is a stable power supply, electric valves can work normally.

-Pneumatic valve: Powered by compressed air, it requires auxiliary equipment such as air compressors and air source processing devices to provide compressed air. Compressed air drives the valve core movement of the valve through a pneumatic actuator to achieve valve opening and closing control.

2. * * Control performance**

-Electric valve: With high control accuracy, it can achieve precise opening control and is suitable for situations where precise control of parameters such as flow and pressure is required. The response speed is relatively slow, especially in large-diameter valves or high load situations, where there may be some delay in the start and stop of the motor.

-Pneumatic valve: With fast response speed, it can quickly achieve the opening and closing action of the valve, suitable for situations that require emergency cut-off or quick response. The control accuracy is relatively low and is generally used in situations where high control accuracy is not required. However, by using high-precision pneumatic locators and other equipment, its control accuracy can also be improved.

3. * * Output torque and thrust**

-Electric valve: With a large output torque, it can be used for valves with larger diameters and higher pressures. But for some situations that require a large instantaneous thrust, electric valves may not perform as well as pneumatic valves.

-Pneumatic valves: Under the same specifications, the output thrust of pneumatic valves is usually greater than that of electric valves, which can meet some applications with higher requirements for valve opening and closing force.

4. * * Applicable scenarios**

-Electric valves: suitable for various industrial applications, especially in environments that require high control accuracy and convenient power supply, such as automation control systems in chemical, pharmaceutical, power and other industries. Due to its relatively poor fire resistance, special explosion-proof electric valves need to be selected for use in some flammable and explosive hazardous areas.

-Pneumatic valves are widely used in flammable and explosive places in industries such as petroleum, natural gas, and chemical. Compressed air is relatively safe as a power source and is less likely to generate hazardous factors such as electric sparks that could cause explosions. In addition, in some situations where fast response speed is required for valves, such as emergency shut-off systems, rapid adjustment systems, etc., pneumatic valves also have obvious advantages.

5. * * Maintenance costs**

-Electric valves: Maintenance is relatively complex, with a relatively high probability of malfunctions in components such as motors, reducers, and controllers. Maintenance techniques require high standards, and maintenance costs are also high. But the daily operating cost of electric valves is relatively low, as long as the power supply is stable, there is no need for additional gas source consumption.

-Pneumatic valves: Maintenance is relatively simple, with the main focus on pneumatic actuators and auxiliary equipment such as air filtration and pressure reduction. But it is necessary to regularly inspect and maintain equipment such as air compressors and air source pipelines to ensure the stability and cleanliness of the air source. Due to the need to consume compressed air, its operating cost is relatively high.

6. * * Cost**

-Electric valves: The initial procurement cost is relatively high, especially for some high-precision, high torque electric valves, whose price may be several times that of pneumatic valves.

-Pneumatic valves: The procurement cost is relatively low, but the supporting air source equipment such as air compressors, storage tanks, and air source treatment devices require additional investment, and the comprehensive cost also needs to be evaluated based on specific circumstances.