DDKK Piston Seal | Double-Lip Bidirectional U-Cup for Hydraulic Cylinders
Polypac’s DDKK Piston Seal features a robust double-lip bidirectional U-cup design, delivering superior durability and extended service life for hydraulic cylinders. This long life U-cup ensures reliable sealing performance under high pressure and dynamic conditions.
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Details
1.Application and properties
DDKK is a two-way sealing and guiding component consisting of one elastic body, one sealing ring, two back-up
rings, and two guide rings. The elastic body is made of nitrile rubber or fluororubber, which applies pressure to the
sealing ring and makes it tightly adhere to the cylinder, thereby providing good sealing action. The sealing ring is a
special PTFE-filled material, which has suitable stiffness and a very low friction coefficient with the fitting friction pair.
The back-up rings prevent the elastic body from being squeezed into the sealing gap, and the guide rings guide the
piston movement inside the cylinder and absorb radial forces. The materials of the back-up rings and guide rings may
be special plastics such as PTFE-filled, nylon, or polyoxymethylene.
It is mainly used for oil cylinders that require a small friction coefficient in the sealing system and have limited
installation space for piston seals.
The outstanding feature of this seal is that the back-up rings, guide rings, and sealing components are installed in
one groove, greatly saving installation space. It is usually used for oil cylinders with smaller diameters, and other sealing
components are not required to be installed on the piston.
2. Standard material
Sealing ring: filled PTFE
Back-up ring: PTFE / PA
Guide ring: PTFE / PA
Tags
Robust Piston Seal
Robust Piston Seal
Long Life U-Cup
Long Life U-Cup
Hydraulic Cylinder Piston Seal
Hydraulic Cylinder Piston Seal
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Polypac is a trusted global supplier of high-performance sealing solutions, providing OEM & ODM services for industries worldwide.
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