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Spring pusher seals

Type 551, BT-FN Mechanical Seal
  • Type 551, BT-FN Mechanical Seal
  • Type 551, BT-FN Mechanical Seal

Type 551

SKU : Type 551

Basic Features

  • Structure: Single End
  • Pressure: Low Pressure Mechanical Seals
  • Speed: General Speed Mechanical Seal
  • Temperature: General Temperature Mechanical Seal
  • Performance: Wear
  • Standard: DIN24960, ISO3069, GB6556
  • Model NO.: 551, BT-RN
  • Balance: Unbalanced
  • Specification: Inner Diameter: 10 mm to 50 mm

Product Detailed Description

YALAN Type 551 Single Coil Spring Mechanical Seal for Water Pumps, Temperature Control Pumps, Vacuum Pumps and Heat-exchange Oil Pumps

Structural Features: single end, unbalanced, conical spring, dependent direction of rotation, spring transmission. This seal component has a simple structure, high compatibility and stable performance with great spring compensation.

Industrial Standards: DIN24960, ISO3069, GB6556

Scopes of Application: widely used in water pumps, temperature control pumps, vacuum pumps and heat-exchange oil pumps. Mainly used in leathering, waste water treatment, plastic, and food machinery industry. This product can be an alternative to similar products such as John Crane Type 551 or EagleBurgmann BT-RN.

  • Operation Parameters:

    • Pressure: 0.8 MPa or less
    • Temperature: - 20 ~ 180 ºC
    • Linear Speed: 10 m/s or less


    • Rotary Ring Face: SS316L/SiC/TC
    • Stationary Ring Face: Carbon/SiC/TC
    • Elastomers: NBR/Viton/EPDM/PTFE/FFKM
    • Springs: SS304/SS316
    • Metal Parts: 410S/SS304/SS316/SS316L

    Mediums: oil, water, weak acid, alkali, and organic solvents.

    Customization: Changes of materials for getting other operating parameters are possible. Contact us with your requirements.


YALAN Seals Global
Anhui, China
21st Floor, Lanjing International Tower
Yaohai, City of Hefei

+86 551 6428 7402

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