DESCRIPTION: The BT Profile U-Cup is an improved seal design for cylinder rods. The BT is an improvement of the existing BS U-Cup seal with enhancements in lip design, and in the Polyurethane compound used. The new BT design has thicker lips than its BS predecessor which produces greater compressive forces in the installed condition. The key benefit is an increased conformity of the elastomer to the metal which improves sealing characteristics. The secondary lip of the BT U-Cup has been moved down the profile and is now closer to the base to improve stability of the seal in the gland itself. This stability helps limit the rocking motion of the seal as the rod cycles, and in turn can dramatically reduce fluid seepage.
ADVANCED SEALING SYSTEM: When the BT U-Cup is used in combination with the BR Buffer Ring the resulting sealing system provides very long life with an exceptionally dry rod. The buffer ring acts as a primary seal and pressure spike suppressor and at the same time allows trapped fluid, sealed by the BT U-Cup, to be pumped back into the system with a check valve effect. Using Parker's P4300, low compression set material, also improves seal performance. The advantage of a seal with lower compression set material is that it has a better "memory" for pushing against the rod and gland surfaces. Again the advantage is better conformity of the seal to the metal.
