BSDL Double Lip

Overview

This product is equipped with a tension spring and a protective lip, featuring an open metallic outer jacket. The sealing materials used are NBR and FKM, with a stiffening plate made from unalloyed steel (DIN EN 10139, DIN 1624) and a spring made from spring steel (DIN EN 10270-1).

FUNCTION

Designed to provide dynamic sealing for rotating shafts irrespective of the direction of rotation, this product also ensures effective static sealing between the sealing lip and the shaft when stationary. The protective lip prevents the accumulation of external dirt, while the metallic outer jacket guarantees a tight and precise fit. It also offers limited sealing for low-viscosity and gaseous media, as well as in split housings.

PRODUCT ADVANTAGES

This product guards against moderate to medium levels of external dust and dirt, ensuring a tight and precise fit. It offers an extended service life and features a reliable design suitable for a wide range of moderately demanding industrial applications. The product provides excellent value for money and is manufactured by certified external suppliers, ensuring high quality and reliability.

Application Limits

  • Maximum pressure: 0.05 MPa
  • NBR temperature range: -40 to 80°C (short-term up to 100°C), max speed: 10 m/s
  • FKM temperature range: -25 to 200°C, max speed: 34 m/s

Media Resistance

NBR:

  • Resistant to various mineral oils and greases
  • Limited resistance to ozone, weathering, and aging

FKM:

  • Resistant to mineral and synthetic oils, fuels, and flame-retardant fluids
  • Excellent resistance to ozone, weathering, and aging

Design Guidelines

  • Design installation space according to DIN 3760
  • Ensure shaft roundness (tolerance class IT8) and appropriate surface roughness (Rz = 1.0 to 4.0 µm)
  • Shaft surface hardness should be at least 45 HRC
  • Housing surface roughness: Rz = 10 to 20 µm
  • Shaft tolerance zone: ISO h11; housing tolerance zone: ISO H8

Installation Guidelines

  • Thoroughly clean the installation area before assembly
  • Avoid pulling the seal over sharp edges; use a mounting sleeve if necessary
  • Do not grease the seal or installation space
  • Ensure careful, non-tilted installation on the shaft

Storage Advice

  • Store at temperatures below 25°C
  • Avoid direct heat sources, sunlight, and condensation
  • Protect from ozone or ionizing radiation
  • Follow ISO 2230 storage recommendations

BSDL Double Lip Metal Cased Technical Information

SpecificationDetails
Pressure CapacityMaximum of 7 psi.
Operational Speed43 ft/s
Temperature Range-40 to 200°C | -40 to 392°F

PTFE Sealing Jacket

MaterialDescriptionTemperature Range
NBRNBR (Nitrile Butadiene Rubber) is a highly valued sealing material due to its excellent resistance to oils, fuels, and other chemicals, making it an ideal choice for applications in the automotive and aerospace industries. With a temperature operating range, NBR provides versatility under varied environmental conditions. Very cost effective option.-40°C to 120°C

-40°F to 248°F

FKMFKM (Fluoroelastomer) is highly regarded in the sealing industry for its exceptional resistance to high temperatures, chemicals, and aging, making it indispensable in aerospace, automotive, and chemical processing sectors. This material thrives across a wide temperature range, enabling its use in extreme conditions where other materials would fail. FKM’s remarkable compatibility with a wide variety of chemicals, including oil, fuel, and solvents, along with its ability to withstand harsh environmental factors, ensures its preference for high-performance seals, O-rings, and gaskets. Its robustness and longevity under aggressive conditions underscore FKM’s value as a premier choice for demanding sealing applications.-20°C to 200°C

-4°F to 392°F

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