Metallic materials of GMN seal components series L/M guarantee highest resistance against coarse and fine contamination.
Metallic materials are suitable for temperatures up to 200 °C.
The L design is particularly suited for use with normal spray load for rotating shafts and hubs.
The M design has grooves on the circumference which are used to remove and return penetrated liquid during heavy and direct spray impact.
The technical data for the M design is the same as for the L design.
Thanks to their non-contact design, GMN labyrinth seals guarantee completely frictionless operation.
GMN seal components work completely wear-free and offer an unlimited service life.
The non-contact design of GMN seal components guarantees operation free from metal abrasion that fulfills the highest cleanliness requirements.
The small distance between the outer and inner ring of just approx. 0.2–0.5 mm guarantees a high sealing effect and highly effective protection from fouling.
Because no friction heat is generated, neither the seal nor the adjacent components or the lubricant are subjected to thermal loads.
The frictionless design enables operation without performance losses. This means that the seal offers maximum sealing effect with reduced energy consumption even at high speeds.
GMN labyrinth seals achieve 2–4-layered labyrinths in the smallest space.
The low gap height creates an air cushion in the sealing gap at high circumferential speeds that increases the sealing effect.
Drainage grooves on the outer ring return any penetrated liquids (M design).
Tolerances
Housing: K7, Shaft: h 6
Surface quality: Rz ≤ 16 µm; Ra ≤ 3.2 µm
Installation
“l” length (chamfering of shaft and housing) depending on the width “W”: l = 0.1 x W
Aluminum outer ring
The aluminum outer ring can be slightly non-round in delivery condition. When the seal is pressed in, the relatively easily malleable ring adapts to the roundness of the hub again.
For production-related reasons, the outer ring can be up to 0.1 mm wider than the inner ring.
GMN labyrinth metal seals are pressed with a calibrating ring (“zero dimension”). The outer ring then springs back again due to its elasticity.
Two metal seals positioned next to each other guarantee absolute leak-tightness with an intermediate drain hole (distance min. 5 mm). Liquid between the seals is drained off reliably.
In limited spaces that do not permit a tandem arrangement, the M model offers a compromise in compact design. Penetrated liquids are removed via grooves in the outer ring into a ring groove in the housing.
Width of the ring groove in the customer part: R = c + 1 mm (c = groove width)
