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Piston seals

Introduction

Piston seals provide the sealing function in
sliding motion between the piston and the
bore of a hydraulic or pneumatic cylinder . Piston seal
These seals need to cope with the differen-
tial pressures acting on the piston while ex-
tending or retracting the piston rod . These
differential pressures can be more than
400 bar e .g . for heavy duty applications .
The pressure acting on the piston seal in-
creases the contact forces and as a result of
this also the friction between the piston seal
and the cylinder surface . Therefore the dy- Double-acting piston seal DK08-P pressurized from the system pressure in a hydraulic cylinder.
namic sealing surface is critical to the sealing
performance and significantly affects the
seal’s lifetime .
Selecting profiles and materials for a pis-
ton sealing system is a complex task, consid-
ering all possible cylinder designs and ap-
plication criteria . SKF supplies standard
piston seals in many different profiles and in
a wide range of materials, series and sizes,
which make them appropriate for a wide va-
riety of operating conditions and
applications .
On the following pages you will find all the
available piston seal designs that are avail-
able as machined versions utilizing the SKF
SEAL JET DD system .
Piston seals are typically classified into
single-acting (pressure acting on one side
only) and double-acting (pressure acting on
both sides) seals .

Double-acting O-ring loaded symmetric slide ring Energizer loaded double acting compact piston
piston seal DK08-P made of ECOPUR DD and seal DK09-D made of ECOPUR DD and
NBR 70 SKF Econbr with integrated guiding elements
made of SKF Ecotal

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