ROD BUFFER SEAL METRIC

9.843" x 10.650" x 0.311" (250.00 mm x 270.50 mm x 7.90 mm)

H&D SKU: MKR-250X270.5X7.9

Product Availability : On Back Order

$373.96

Qty:

DESCRIPTION

The MKR 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 MKR is a uni-directional seal, with a unique design that allows the seal to relieve pressure build up. This pressure relief feature allows the MKR to be used in a tandem or multiple seal arrangement.

The MKR 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.

When using the MKR series as the primary seal, a double-acting wiper must be used to contain fluid until rod retraction allows return of the fluid into the system. With strokes of more than 3 feet, the gland must be designed to provide an oil storage chamber between the seals. Please consult the H&D technical group for more information.

For high temperature applications, the MKR-V seal can be used. Temperature rating is -20 to 400F and uses a Fluorocarbon energizer in place of standard Nitrile

SEAL INFORMATION

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

Max Pressure (psi): 5000

Extrusion Gap at Various Pressures (mm):

1,500 PSI: 0.80
2,900 PSI: 0.60
5,800 PSI: 0.35

Max Speed (ft/sec): 49.0

Mating Surface Roughness - Ra (µm) - DYNAMIC: 0.1<>0.4

Mating Surface Roughness - Ra (µm) - STATIC: 1.6 MAX

Part Number Definition (Metric): MKR-(ROD DIAMETER)X(OD)X(SEAL HEIGHT) - ADD -V FOR FLUOROCARBON ENERGIZER

Additional Part Number Definition (Metric): 70 X 85.5 X 5.9 = MKR-70X85.5X5.9 (OR MKR-70X85.5X5.9V

Products specifications

ID (Inch)	9.843
OD (Inch)	10.650
Height (Inch)	0.311
ID (Metric)	250.00
OD (Metric)	270.50
Height (Metric)	7.90

Alternate Product Codes

R250270076RZ (1)

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