What Is The Difference Between Hydraulic Cylinders And Pneumatic Cylinders

It is important to know the difference between hydraulic cylinders and pneumatic cylinders when it comes to making selection and decision of your applications. This article generally described the main difference between the two and compared their advantages and disadvantages.

Definition of hydraulic cylinders and pneumatic cylinders.

  • Hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating or swinging motion.
  • Pneumatic cylinder is a pneumatic system component that converts air pressure energy into mechanical energy and performs linear reciprocating motion.

Difference between hydraulic cylinders and pneumatic cylinders.

1. Working principle is different.

  • The pressure of the pneumatic system of the pneumatic cylinder is generally in the range of 0.2-1.0Mpa, so it is not available as a high-power power element.
  • But the hydraulic cylinder can be used as a relatively large power component using the hydraulic system.

2. Working medium is different.

  • Hydraulic cylinders rely on hydraulic oil to operate normally which is a non-renewable resource and cannot be used cyclically, and the used hydraulic oil will have an impact on the environment.
  • The pneumatic cylinder uses air to complete the operation which is inexhaustible, without cost and supply difficulties. The used gas is directly discharged into the atmosphere, which is convenient for processing and can be reused without any pollution.

3. Working resistance is different.

When the pneumatic cylinder is in application, the air viscosity is small, and its resistance is less than that of hydraulic oil.

4. Use efficiency of resources is different.

The compression rate of air is much greater than that of hydraulic oil, so the working stability and response of the pneumatic cylinder is worse than that of the hydraulic cylinder.

Advantages and disadvantages of hydraulic cylinders and pneumatic cylinders.

Hydraulic cylinders.

  • Advantages: hydraulic cylinder is simple in structure and reliable in work. When it is in application to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is stable. Therefore, it is widely used in various mechanical hydraulic systems.
  • Disadvantages: common faults are hydraulic cylinder malfunction, inability to push the load, and piston slippage or crawling.

Pneumatic cylinders.

  • Advantages: the principle and structure of the pneumatic cylinder are simple, easy to install and maintain, and the requirements for users are not high.
  • Disadvantages: the pneumatic cylinder is prone to plastic deformation and leakage during use.

The main differences between hydraulic cylinders and pneumatic cylinders are as described above. In general, each has its own advantages and disadvantages. The most important thing is to make the best use of the material in the specific environment and specific application, for the benefit of mankind.

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