The KR profile is a rod seal that can be used as a buffer seal in conjunction with other primary rod seals or in tandem with itself, creating a zero leak seal. The KR is a uni-directional seal, with a unique design that allows the seal to relieve pressure build up. This pressure relief feature allows the KR to be used in a tandem or multiple seal arrangement.
The KR features low friction, long life, and versatility. When the rod is going through its power stroke (higher pressure) the seal is riding on a sealing point, creating a high compression point and limiting leakage. As the rod goes to its return stroke, it rocks forward, creating a larger sealing surface on the rod. The compression force is spread out over a larger area, reducing the load on the rod. This allows any trapped fluid to easily return to the system.
For high temperature applications, the KR-V seal can be used. Temperature rating is -20 to 400F and uses a Fluorocarbon energizer in place of standard Nitrile
Material Type (Primary Seal): 40% BRONZE-FILLED PTFE
Material Type (Energizer): 70A NITRILE
Material Type (Energizer): 75A FLUOROCARBON
Durometer (Shore D): 63
Temperature Range (F) NITRILE: -40 TO 220
Temperature Range (F) FLUOROCARBON: -20 TO 400
Extrusion Gap at Various Pressures (in):
- 1,500 PSI: 0.039
- 3,000 PSI: 0.031
- 5,800 PSI: 0.020
Extrusion Gap WITH WEAR RINGS at Various Pressures (in):
- NOTE: THE GAPS STATED APPLY WHEN THE SEAL IS SPECIFIED WITH WEAR RINGS. WHEN NOT USING WEAR RINGS, THE EXTRUSION GAP SHOULD BE REDUCED.
Max Speed (ft/sec): 13.0
Mating Surface Roughness - Ra (µin) - DYNAMIC: 4<>12
Mating Surface Roughness - Ra (µin) - STATIC: 63 MAX
Part Number Definition (Inch): KR-(ROD DIAMETER)(O-RING SERIES) - ADD -V FOR FLUOROCARBON ENERGIZER