13 Dec
designing fluid power systems

Common mistakes people make when designing fluid power systems

A proper fluid power system is very essential for the efficient functioning of the power system. It requires some very accurate and professional designers in order to do it. There are some terms in the fluid power system which may sound similar but they are different in reality.

But the problems arise when the people or designers get confused with this. These are only some of the mistakes which occurs while designing the power systems. There are many other mistakes too. Some of the common mistakes which generally occur in the designing of fluid power systems and the air valve have been discussed below.

Cylinder extension and retraction forces

Mostly, people are confused between cylinder extension and retraction forces. If your rod is not attached to your device, a cylinder would be useless. The rod moves in a reciprocating motion. The cylinder rod is attached to the piston which has pressurized fluid which acts upon the rod.

Cylinder extension and retraction forces

Most of the mistakes occur when the designer calculates the force required in an application involving both push and pull, using only the piston side. The problem arises when the designer considers only the tension and not any other force while calculating the piston side. As a result, the cylinder cannot move and the push might not be equal to the pull. If you do not commit this mistake, you will be saved from doubling your piston pressure which will add up to more power and cost.

Pressure and flow

Pressure and flow are the other mistakes which most of the designers commit. Some designers in order to lift a bigger load, require more force and require a bigger pump. They think that a smaller pump will raise the pressure slightly while preserving the input horsepower.

Most designers commit the mistake of confusing between pressure and flow in valves. While adding and choking the inline flow control to the system, the upstream pressure will rise. Most of the designers believe it to be adjusting the pressure. On the other hand, in a sub circuit controlling motor, if you put a relief valve, it will create a back pressure causing the relief valve to start damping fluid to the tank, making the designer believe it to be a metering valve. Thus, it is important that you know the difference and the relationship between the pressure and flow.


These are some of the few mistakes which you must look to avoid.