Page 322 - Katalog náhradních dílu a komponent pro všeobecnou údržbu 2015|16

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MOUNTING AID
PISTON SEALS
What use is the best seal if it is not properly fitted or is damaged during fitting? To make sure that this doesn’t happen, Freudenberg Sealing Technologies provides you with a tailor-made range of fitting tools. Impeccable fitting is key to the performance and operational durability of a seal and thus represents a significant quality factor. With fitting aids from Freudenberg Sealing Technologies:
■ you will avoid fundamental fitting errors
■ you will avoid damaging the sealing lip during
fitting
■ you will increase the service life of the seal
■ thus saving you time and expense.
Two methods have proved useful in practice for fitting piston seals, irrespective of the material: using an expansion nozzle and fitting cone and using fitting strips and a calibration sleeve.
1. Fitting with expansion nozzle and fitting cone
Two-component piston seals are fitted in two stages: the contact ring is fitted first and then the profile ring. This eliminates the need to calibrate the piston seal.
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The fitting of both the contact ring and the profile ring is carried out in each case by following the same process:
■ Place the fitting cone onto the piston.
■ Lay the contact ring/profile ring onto the fitting
cone.
■ Expand the contact ring/profile ring across the
cone with the expansion sleeve and snap into the groove.
2. Fitting with a fitting strip and calibration sleeve
Piston seals can also be fitted easily using approx. 30-millimeter wide fitting strips made from tear- resistant nylon. With this method, the rings are snapped over each other in two stages, each with two fitting strips. PTFE profile rings should be heated to approx. 80°C before fitting in water or oil. The piston seal is then calibrated in the piston bore using a calibration sleeve.
1. Fitting with spreading nozzle and mounting cone
2. Fitting with mounting tape and calibration sleeve
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