Pro Tips for installing piston seals catalogue (Sept.2020)

Pro Tips for installing piston seals catalogue (Sept.2020)


How to install Piston Seals Catalogue properly? Step by step Guide

Piston seals catalogue is a vital part of any machine.  This material is essential for the reliability of the piston

The material often selected to meet these requirements is PTFE. It exhibits exceptionally low sliding and static friction as well as good chemical resistance.

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However, piston seals catalogue have some limitations. The most notable is the limited elasticity of the material with a risk of damage to the seals during assembly. PTFE gaskets should be stretched using special sleeves prior to installation. And then calibrated to the correct diameter.

Tips for installing piston seals catalogue

It is important to follow accurate guidelines to install piston seals.

  • Before installing the sealing parts, all mating parts of the hydraulic unit must be flushed from:
  • Dirt
  • shavings and other foreign particles

You should clean with compressed air and coated with working fluid.

Similarly, one needs to be careful. Because sharp edges of parts with which the seals may come into contact during installation. Technician should make them round.

The end of piston seals catalogue must have a chamfer.  The dimensions of which are shown in the descriptions for each seal type. The edge at the transition from the chamfer to the sliding plane must be rounded and polished.

During installation, do not push seals over sharp edges of grooves, holes, threads, etc.

  • The accessories used during the installation must be made of soft material. It should exclude damage to the seals. And in addition, be suitable for the type and dimensions of the seals.
  • To increase the flexibility of seals, it is recommended to preheat them with immersion before installation:

Piston seals catalogue material guidelines for installation

1) For thermoplastic polyester and fluoroplastic in boiling water for 1-2 minutes;

2) For thermoplastic polyurethane in hot oil for 1-2 minutes.

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Installation of piston seals

Piston seals catalogue can be installed in open or closed grooves. Small seals with a diameter of up to 50 millimeters are recommended to be installed in an open groove.

This installation method is done manually and is usually straightforward. Fitting flexible seals into a closed groove can be done manually. At the same time, using 2 synthetic tapes threaded under the sealing element, it greatly simplifies the installation process.

The installation of little elastic seals on integral pistons must be carried out using special mounting accessories.

When installing two-piece seals, the rubber grip ring is first installed manually. Twisting the ring is not allowed. This method guarantees piston seals catalogue:

  • Ease
  • accuracy and
  • safety of installation

To eliminate the possibility of rupture, O-rings made of PTFE-based material must be pre-heated.

Rod piston seal installation

Rod Seal Installation Similar to piston seals, rod seals can also be installed in open and closed grooves. It is recommended to install seals with an outer diameter less (6-8) times the profile thickness in an open groove. Such installation is possible without using additional devices (manually).

Fitting the piston seals catalogue into the closed groove is done using a suitable plastic mandrel and plug. When installing two-piece seals, first insert, without twisting, the compression rubber ring and then the profile sealing ring.

The process of installing rod seals is greatly simplified by the use of special pliers. To avoid sharp bends of the seal, the diameter of the fingers on the pliers must be at least (0.15-0.2).

After installing the seal, it is required to calibrate it with a special mandrel. In terms of dimensions, surface quality and the presence of a lead-in chamfer that completely repeats the hydraulic cylinder rod.

An oiled mandrel should be pushed into the low pressure side of the piston seals catalogue. It should be go with slight twisting to both sides. Moreover, one needs to and pull smoothly through the seal.

Due to the age of use or misuse, the hydraulic seals fail over time and must be replaced. The design engineer can reduce the damage done to hydraulic seals. By keeping in mind what usually leads to failure and trying to prevent negative impacts.

Piston seals catalogue Hardening

Piston seals catalogue when exposed to high temperatures. This can be caused either by a high fluid temperature or by a high rate of heat generation from stroke operations. When the cuffs harden, they crack and lose elasticity. It results in seal damage.


Due to insufficient lubrication or excessive lateral loading, wear on the dynamic seal lip surface can cause significant damage.


Installation tools and processes are critical to maintaining seal life. Improper installation can result in cuts or dents in the dynamic lip of the oil seal. This affects the performance of the hydraulic oil seal and also introduces foreign material into the hydraulic fluid.


Cracking is a condition resulting in scorching, tearing, long cracking and complete rupture of the dynamic side of the cuff. This is due to excessive back pressure, high pressure shocks / surges, or the use of poor quality materials in the cuff manufacturing process.

Incorrect installation

As previously mentioned, improper installation can create problems with the piston seals catalogue. This can lead to contamination and incorrect calibration of the selected cuff. The selection of the cuff prior to assembly is very important to ensure that the design is correct and to ensure proper sealing.


External debris entering the hydraulic rod will cause contamination. When particles of dirt or powder adhere to the piston, they contaminate the seal. The dirtier the seal, the more it loses its ability to seal against contamination from the piston area.

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Piston seals catalogue conclusion

The piston seals catalogue is destroyed when it encounters a corrosive liquid. This occurs when the wrong seal material is selected for the fluid. The use of incompatible materials results in chemical attack of the oil additives. This leads to disruption of the contact surface at the lip of the cuff. Cuff discoloration is an indicator of chemical erosion.