Pneumatic butterfly valve working principle and structure diagram

Today, pneumatic butterfly valve is used more and more widely, such as chemical industry, paper industry, coal mining, oil, medical and other fields will use pneumatic butterfly valve.  Pneumatic butterfly valve is widely used because of its simple structure, easy maintenance, and rapid switch, greatly improving work efficiency, reduce maintenance time.  This article will introduce the working principle and structure of pneumatic butterfly valve for you.  

Pneumatic butterfly valve working principle  

Pneumatic butterfly valve is composed of pneumatic actuator and butterfly valve.  Pneumatic butterfly valve by compressed air as a power source, through the valve stem to control the disc rotation around the axis, when the valve from the initial position of 90° rotation is an end of the action (from off to open), and vice versa for another end of action (from open to close).  

By pneumatic butterfly valve positioner, solenoid valve, such as equipment, absorb and control the air, will be sent to the air inside the cylinder, and air compression become pneumatic actuators, when the compressed air inside the cylinder block incoming actuator air chamber, air pressure on the piston, the thrust output shaft rotates to drive the stem and disc rotating at the same time, is complete an opening and closing butterfly valve.  

Add a valve positioner to the pneumatic butterfly valve, you can accurately adjust the opening.  Intelligent positioner can also be used to connect with the field bus to detect the working state of the pneumatic butterfly valve.  

Pneumatic butterfly valve structure  

Pneumatic butterfly valve structure is very simple, by the body, stem, seat, butterfly plate and pneumatic actuator composition.  

Valve body is the support of the whole butterfly valve, several common materials according to the performance of gray cast iron, nodular cast iron, cast steel, stainless steel material performance is the best.  

Stem in the body, connected with the butterfly valve transmission device and butterfly plate, by driving the transmission device to drive the stem rotation, stem and butterfly plate to do rotation, to realize the opening and closing of the valve, stem material usually use stainless steel.  

Valve seat and butterfly plate, are in direct contact with the medium inside the pipe parts, received the media erosion and corrosion is the largest,  

Butterfly plate material is the most common of two kinds: ductile iron and stainless steel.  

The pneumatic actuator of the pneumatic butterfly valve is controlled by the solenoid valve to open and close the inlet.  

The working principle and structure of pneumatic butterfly valve is introduced to you here. If you want to purchase pneumatic butterfly valve products, you can contact Bundor Valve for inquiry.