What is the difference between pneumatic butterfly valve and electric butterfly valve?

Electric butterfly valve overview:

Electric butterfly valve can be classified as a large category of electric valve, also can be classified as electric control valve. The connection method of electric butterfly valve mainly includes: flange connection and sandwich connection; Electric butterfly valve seals mainly include: hard seal and soft seal. Electric butterfly valve through the electric actuator to control the electric butterfly valve switch closure. It can be used as block valve, control valve and check valve in pipeline system. With manual control assembly, if there is any problem with the actuator, the switch closure of the valve body can be controlled by manual device, which will not affect the working condition.

Operating principle of electric butterfly valve:

The working power supply of the electric actuator usually has: AC220V, AC380V, etc. Input signal: 4~20mA 0~10v weak current signal. After the adjusting electric actuator and valve stem are installed and adjusted; Drive the butterfly valve disc with the electric energy as the driving force, making 0~90° partial reverse rotary movement. Receive 4~20mA signals from the industrial automation control system to accurately control the valve switching degree, so as to achieve the flow, temperature, pressure and other different demand parameters regulation and control.

Overview of pneumatic butterfly valve:

Pneumatic butterfly valve is composed of pneumatic actuators and butterfly valves. Pneumatic butterfly valve is used with the stem rotation of the circular disc do open and close, has completed the switch of the pneumatic valve mainly do block valve application, can be used as a switch and adjustment of the application, now the butterfly valve in the high pressure medium and large caliber pipeline applications more and more. Pneumatic butterfly valve classification: stainless steel pneumatic butterfly valve, hard seal pneumatic butterfly valve, soft seal pneumatic butterfly valve, carbon steel pneumatic butterfly valve.

Working principle of pneumatic butterfly valve:

It is composed of the pneumatic actuator and the butterfly valve. The pneumatic butterfly valve drives the actuator to drive the circular butterfly plate to do 90° rotation movement through the compressed air entering the pneumatic actuator, so as to serve as the pipeline switch and adjust the flow. Pneumatic butterfly valve is through the 0-90 degrees of opening and closing as a working principle. That is, 0 degrees is the state of full close, and 90 degrees is the state of full opening. Add a positioner on the pneumatic actuator, input the corresponding signal, the butterfly valve disc version can be adjusted from 0 to 90 degrees. It can be used as pneumatic regulating butterfly valve, in addition to filter reducing valve and solenoid valve can be added to better control the use of pneumatic butterfly valve.

Pneumatic clamp butterfly valve

Comparison of actuators: an actuator is a device in an automation tool that receives control information and exerts control over a controlled object. Actuators are divided into pneumatic, electric and hydraulic actuators according to the driving energy used. Electric and pneumatic actuators are the mainstream actuators at present.

We mainly from the initial cost, operation, performance, scale, speed of action, corrosion resistance, operation safety, maintenance, failure safety after-sales guarantee, maintenance, manual operation these aspects to carry out a comprehensive comparison.

From the cost, the price of pneumatic actuator is relatively low, electric actuator is relatively expensive, so you can reduce the use of pneumatic.