DK C522 Z5050 Cylinder Pneumatic Double Acting Piston Seal DK 125 20 28

DK C520 Z5050 NBR Rubber Piston Seal for Pneumatic Air Cylinder Seals DK 125 20 26

DK C522 Z5050 (DK 125 20 28) Complete piston with integrated seals Praedifa series DK. 125mm OD 20mm ID 28mm Height.

A double-acting cylinder is a cylinder in which the working fluid acts alternately on both sides of the piston. A double-acting cylinder is used where an external force is not available to retract the piston or it can be used where high force is required in both directions of travel.

The DK complete piston with integrated end position cushioning is available in the following compounds:
Z5051 - Industrial purpose
Z5071- Heavy-duty
Z5067- High temperatures
Z5086- Medium-duty

The double-acting DK pneumatic piston is a two-component seal design consisting of a metallic supporting element with a vulcanized guiding ridge and sealing lips. The complete piston performs two functions: sealing and guiding. Complete piston for double-acting pneumatic cylinders with and without cushioning, provided that no excessive lateral guidance loads will occur (long strokes and buckling).

Piston Seals or Piston Rings are used in hydraulic cylinders for fluid sealing and are designed to ensure that pressurised fluid does not leak across the cylinder head as the system pressure pushes the piston down the cylinder bore.
The choice of piston seal is decided by the way in which the cylinder operates. For a cylinder which is exclusively single-acting, capable of sealing dynamic pressure from one side (unidirectional), it is always best to choose the type of seal designed to provide optimum sealing qualities for single-acting functions.
The best sealing capacity of a double-acting cylinder, capable of sealing dynamic pressure from both sides (bidirectional), is achieved by choosing a double-acting seal.
A piston design where two single-acting seals on the piston for a double-acting cylinder are used can easily give rise to a breakdown. The reason is that a very high pressure can be trapped between the seals.
Piston seals, both single- and double-acting, can be designed for and used with integrated or separate back-up rings and guide rings.

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