— Generality of pneumatics —

• ➤ Generality of pneumatic technology

  Air pressure is a device to compress the air and transform the fluid dynamic into mechanical power and generates mechanical energy.

• ➤ Property of air

  Under common conditions , the absolute pressure of air is 760 mm - Hg , 75% relative humidity and weight of 1.293 kgf/m2 , named as atmosphere.The property of air is divided into pressure, density , specific gravity , air viscosity and the moisture contain is the air and dew point.

• ➤ Advantages of drawback of pneumatic

  Advantages	Drawbacks
  1. Compressed air is easy to get.	1. Unable to obtain maximum output : the maximum output is about one ton.
  2. Storage easily.	2. Poor speed control and difficult to stop immediately.
  3. Easy to transmission.	3. Moisture in the air leads to corrosion of components.
  4. Stageless speed variations.	4. Pipe line can not be too long , could easily lead to pressure loss.
  5. Low cost	5. Making a lot of noise
  6. Action fast.
  7. Low danger.
  8. Able to be used in the temperature range of -20 ~ 200oC.
  9. Meet the requirement of environment protection and no pollution.
  10. Simple operation , easy maintenance and management.

• ➤ Pneumatic system