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Parker Type DK 4009 Z5051 DK 40 10 18 Pneumatic Air Cylinders Complete Piston Seals
DK 4009 Z5051 (DK 40 10 18) Complete piston with integrated seals Praedifa series DK. 40mm OD 10mm ID 18mm 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.
Technical Data:
| Product Name | Piston Seal |
| Series | DK |
| Media | Air |
| Polymer Material Options | NBR, TPU |
| Max Operating Pressure | 16bar |
| Max Operating Temperature | -35 to -10℃ |
| Min Operating Temperature | 80 to 200℃ |
| Max Surface Speed | 1 m/sec |
Main Dimension:
Feature:
• Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
• Immediate response (full pressure load) thanks to incorporated venting channels.
• Good wear resistance.
• Ideal corrosion protection thanks to complete elastomer covering.
• Smooth running due to optimum adjustment of the functional lips.
• Easy attachment to the piston rod without additional sealing elements.
• Easy installation due to integrated static sealing function.
• Excellent media resistance in case of suitable compound selection.
• Low assembly height of the complete piston enables short cylinder designs.
• Versatile complete piston for nearly all cylinder designs.
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