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How do you select hydraulic cylinder seals?

Hydraulic cylinders do the work of harnessing fluid pressure and flow to generate linear motion and force. They are used in industrial machines like presses and plastic molding machines. Also, in mobile equipment like excavators and mining trucks! 

Selection of Proper Hydraulic cylinder seals:

The main objective of designing hydraulic seals is to manage high-pressure dynamic applications, mostly hydraulic cylinders.

An Unsuitable hydraulic seal can cause cylinder oil leakage and easy deformation and failure of the seal. 

 The parts of the cylinder that need to be sealed are usually included rod, ram, gland, or Hydraulic cylinder piston seals, which may also require wipers or bearing strips. After knowing the place to seal, one will understand if it is a single acting or double acting seal method.

 They are selected by the guidelines given below:

 a. reciprocating speed

b. fluid pressure range

c. temperature ranged. fluid media

e. application

a) One should choose the right cylinder type:

There are two basic hydraulic cylinder designs. They are for industrial applications like tie-rod and welded cylinders. The Hydraulic seal manufacturers help in the selection of seals by issuing many guidelines. 

The tie-rod cylinders are designed in such a way, where they can use the high-strength threaded steel tie rods. It is always on the outside of the cylinder housing. It gives additional strength and strong stable functioning. NEPA is the standard measurement tool. The tie-rod cylinders are manufactured as per the standards set and thus, manage the dimensions and pressure ratings accordingly.

Hydraulic cylinder piston seals are selected by many norms. There is heavy-duty housing with a barrel welded in mill-type cylinders or welded cylinders. They are bolted directly to the end caps.

b) Selection of proper mountings:

In a cylinder’s performance, it should be noted that mounting methods play a very decisive role. The Hydraulic piston seals suppliers globally advise users on cylinder mounting methods. In stationery cylinders, the fixed mounts on the centerline of the cylinder are advised. They are ideal for straight-line force transfer which causes less wear and tear. One has to take care as to mount the cylinder even if it is the cylinder body is stationed or pivots.

The tie-rod cylinders possess high-strength threaded steel tie rods on the outskirt of the cylinder housing. This gives more strength and stability. There are guidelines for all the cylinders. They are the bore diameter, stroke, rod diameter, pressure ratings, etc. The installations of cylinders are very easy. They can be mounted either sideways or foot – mounted. Thus, it is relatively easy to generate offset loads.

Piston-rod diameter is critical in Hydraulic cylinder piston seals. Piston-rod diameters can range from 0.5 to more than 20 inches. The sizing of the loads is very important. The Hydraulic seal manufacturers always take into consideration while designing a cylinder to generate a required force, sizing the rod is always the first consideration. Need to determine bore size for the available pressure!

c) Rod bending needs to be prevented:

There are instances of a fully extended rod, which will bend under its weight, mostly in cylinders with long strokes.

Excessive bending leads to wear and damage to Hydraulic cylinder piston seals. It could also cock the piston inside the bore, which can score and damage the inner surface of the cylinder. The Hydraulic seal manufacturers always take care during production to see that the rod deflection should never exceed 1 to 2 mm.

It could even cock the piston inside the bore, which damages the inner surface of the cylinder. 

d) Sizing is very important:

Most of the companies use smaller cylinders for being cost-effective. They operate at higher pressures. Also, the smaller cylinders require less flow. Mainly the smaller pumps, lines, valves, etc. Many installations see an overall cost reduction by moving to higher pressures according to many Hydraulic piston seals suppliers.

To choose a cylinder with a weight of 20% more is required than the load. The Hydraulic cylinder piston seals will suffer efficiency losses, actual pressure below the rated system pressure, slip-stick on a cylinder, and bearings!