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How do you bleed air from a hydraulic cylinder?

If you want to know how to bleed a hydraulic cylinder, you've come to the right place. This article explains how to do it step by step. With instructions and advice, here's how to bleed the air from a hydraulic cylinder.

Hydraulic cylinders: definition, types and roles

Before going through the various steps involved in bleeding air from a hydraulic cylinder, let's look at how such a system works.

Hydraulic cylinders are used in many sectors, including agriculture (on equipment), public works (on machinery) and industry (on certain machines). Its job is to transform energy into mechanical force. There are several types of hydraulic cylinder available today: single-acting and double-acting. Their dimensions are different. As a result, the force and speed vary. Here are a few explanations of these two types of hydraulic cylinder and how they work:

- Single-acting hydraulic cylinders: act in one direction only. Pressure can only be applied to a supply port. As soon as the movement is completed, the cylinder returns to its starting position. This action is made possible by the effect of weight.

- Double-acting hydraulic cylinders: this model produces two movements. With this cylinder (which has two supply ports), both chambers can be supplied with power at the same time.

While the type of hydraulic cylinder must be taken into account when choosing your hydraulic cylinder, other parameters should also be considered to make the right choice: the diameter of the rod and piston, the type of mounting and the external diameter should all be analysed.

Bleeding air from a hydraulic cylinder: what are the steps to follow?

Having discovered the role and different models of hydraulic cylinders, we now turn to the steps to follow to bleed the air from a hydraulic cylinder. If your cylinder has a bleed screw, here's how to bleed it:

  • - Open it;
  • - Move the rod back and forth inside the cylinder several times;
  • - Collect any fluid leaking from the screw.

If your hydraulic cylinder is double-acting, the principle is the same. However, the two bleed screws should be opened alternately.

Does your cylinder not have a bleed screw? The steps for bleeding air from your hydraulic cylinder are different from those for a hydraulic cylinder with a bleed screw. To bleed the air, you need to move your cylinder back and forth several times. This action should evacuate the air.

If these two steps are not enough to bleed the air from your hydraulic cylinder, we recommend that you refer to the instructions included with your device. The steps for removing air from your hydraulic cylinder are probably mentioned.

Would you like to bleed the air from your hydraulic cylinder? You now have a clearer idea of the procedure to follow. As you've seen, the steps to follow differ depending on the type of hydraulic cylinder (whether it has a bleed screw or not). All you need to do is follow the appropriate procedure to bleed the air from your hydraulic cylinder.

If you'd like to find out more about hydraulics, we invite you to visit our website au-comptoir-hydraulique.fr. You'll find a wealth of information and the hydraulic components you need!

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