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D-A-S COMPACT SEALS
Description
The Compact Seal is a double-acting seal and guide element comprising an elastomeric profile seal ring, two back-up rings and two guide rings. The profile seal ring seals in both the static and dynamic range whilst the back-up rings prevent extrusion into the sealing gap. The function of the guide rings is to guide the piston in the cylinder tube and to absorb transverse forces. The design provides a compact seal and guide combination for a closed or split installation groove.
Designs
The Compact Seal is available in various profile geometries which are in practical use. The choice is normally determined by the existing installation grooves.
DAS Type A
This type is characterized by the straight, long-sided L-profiles of the guide rings. Compared with Type B, it exhibits a smaller groove depth with the same cylinderdiameter.
DAS Type B
This type is characterized by a Z-shaped back-up ring which forms a chamber with the elastomer seal ring on the inside and is centered on the outside by the guide ring.For many piston diameters, the width of the guide ring (dimension L2) can be selected due to sideloads.Due to the larger groove depth, the profile of the seal ring is more rigid than that of Type A and requires higher installationforces.
Advantages:
1)Capable of installation in closed grooves for reduced machining costs
2) Economic sealing and guiding solution
3) Simple snap installation.
Application Examples:
The Compact seals are the recommended sealing element for double acting pistons of hydraulic components such as:
1) Machine tools
2) Truck &crane
3) Forklifts & handling machinery
4) Agriculture equipment
Materials
P S T  D-A-S Compact Seal is available in the following material combinations:
Profile seal: NBR 70 Shore A
Back-up Ring: Polyester elastomer
Guide rings: POM
PU DAS
Description
The Compact Seals are double-acting piston seals with integrated guide rings . The combination of the elastomer energiser and the polyurethane special shaped sealing element provide excellent sealing effect and service life.The function of the guide rings is to guide the piston in the cylinder tube and to absorb transverse forces.
Type PU DAS
For the Compact Seal PU DAS is designed without Back-up rings. For easy installation in closed grooves, the combination into one stiff sealing element and one soft energizing element is required. Back-up rings are unnecessary thanks to the high extrusion resistance of the polyurethane material.
Advantages
1) High wear resistance
2) Low compression set
3) Optimal leakage control
4) Easy installation into closed grooves
5) Excellent service life
Application Examples
The P S T Compact seals are the recommended sealing element for double
acting pistons of hydraulic cylinders for:
1) Truck cranes
2)Mini excavators
3)Heavy duty cylinders
Materials
The Polyurethane Compact seals PU DAS is available in the
following composition:
Sealing ring: P S T Polyurethane 93 Shore A
Energiser: NBR70 Shore A Type PU DAS
Guide rings: POM
 
 
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ADD : Detai Road,Quanzhou Economic & Technological Development Area,Quanzhou City,Fujian,China.
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