U-Packing

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VALQUA No.
Construction machinery buffer
Product name
Synthetic Rubber Molded Product U-Packing
Shape
U-PK asymmetrical edge lip(R)
U-PK asymmetrical edge lip(R)
Features1
For hydraulic use
Features2
Exclusive for rod seal application
Features3
Low resistance
Inventory status
Manufacturable product

Standard size
　
Type
Lip

Application classification
For rods
Pressure classification
High pressure (construction machinery)
Standard material
Usage location Material name Material No.
Main part TPU R6390

Non-standard quality of material (adaptable material)

Sealing direction
Flat surface Cylinder Cylindrical piston Cylindrical rod
- - - ○ Exclusive
Size
Rod: φ18～280
Actual: over φ1000

■ Product content and main applications

Product content
Polyurethane rubber material is molded into a ring shape with a U, J and L-shaped cross section.
Main applications
It is used as seal for various types of hydraulic machinery from -20 to 110℃. Especially appropriate for hydraulic cylinder packing that needs high-pressure and abrasion-resistant properties.

■ Service temperature range

Rubber material Service temperature range
TPU -20℃ ～ 110℃
Click here for the list of rubber materials

■ Operating pressure, pressure direction and pressure types

Pressure Pressure (with back-up ring) Pressure direction
37MPa The standard type is with a back-up ring. One-side pressure
-

Pressure types
shock, surge, pulse, vacuum		 They can all be accommodated

■ Motions and strokes applied

For fixing -
Reciprocating ○
Rotating ×～△
Helical △
Opening and shutting ×
Sliding ×
Oscillating -
Stroking
Stroking is not specified; however, a short stroke could cause a lack of lubrication.

■ Fluid, speed and PV value

Liquid ○
Gas △
Fine particle ○
General dust -
Oil film -
Speed
0.04～1.0m/sec
PV Value
-

■ Lubrication, mountability, sliding resistance, compression resistance, eccentricity/inclination, conformance

Lubrication
Needed
Mountability
Fair
Sliding resistance
and compression resistance
Low
Eccentricity/inclination
and conformance
High


■ Cross-section dimensions and design precautions

・Cross-section dimensions


・Design precautions

Acceptable as long as it is designed based on design criteria

■ Case examples of defects and countermeasures

■ FAQ

‣FAQ about high performance elastomer is here
 ‣FAQ about the elastomer is here

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