Pneumatic aeration butterfly valve is made up of pneumatic actuator,valve body assembly and handwheel.

Structure

 Piston type pneumatic actuator

Single-action and double-action are available according to working condition.Double-acting actuator makes valve stay on the working condition when it is power loss or air pressure loss.Single-acting actuator makes valve stay on extreme position(full-on or full-off) to ensure safety of pipeline.Single-action actuator contains air-to-close type and air-to-open type. Air-to-close type:original state is full open and close with the increase of signal till full-off. Air-to-open is the opposite.

How single-action type piston actuator works

On receipt of inlet pressure signal,the actuator rotates stem to compress spring.Piston and stem drive output shaft,shaft and disc to change flow area between disc and seat. 

Main parts and materials

Established in 2012,Hangzhou Niuzhuo Valves Industrial Co., LTD. is a manufacturer and exporter that is concerned with the design, development and production of valves.
HZNZ is located in Hangzhou, with convenient transportation axxess.Covering an area of 13000 square meters, HZNZ now have about 100 employees, an annual sales figure that exceeds USD 7.7 million and are currently exporting 22% of our production worldwide.
All of our products comply with international quality standards and are greatly appreciated in a variety of diffrent markets throughout the world.
As a result of our high quality products and outstanding customer service, we have gained a global sales network reaching Korea , Thailand, Malaysia,Mid East and more.
If you are interested in any of our products or would like to discuss a custom order, please feel free to contact us. We are looking forward to forming successful business relationships with new clients around the world in the near future.