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Mechanical Seals for Pumps

Product Description

  • Conical or cylindrical spring
  • Elastomer bellows rotating
  • For plain shafts
  • Independent of direction of rotation
  • Metric and inch sizes available
  • No torsion on bellows and spring
  • Single and dual seal
  • Special seat dimensions available
  • Unbalanced


Item Description 
1.1 Seal Face
1.2 Bellows
1.3 Driver collar
1.4 “L” ring (spring collar)
1.5 Washer
1.6 Corner Ring
2 Spring
3 Seat
4 O-Ring

Technical Features

  • Fits into any installation space due to smallest outer seal diameter
  • High flexibility due to extended selection of materials
  • Important material approvals available
  • Individual installation length can be achieved
  • Universal application (standardization)

Typical Industrial Applications

  • Food and beverage industry
  • Multi-stage pumps (non-drive side)
  • Media with low solids content
  • Pressure oils for bio diesel fuels
  • Water and waste water technology
  • Water and waste water pumps
  • Cooling fluids
  • Circulating pumps
  • Oil applications
  • Chemical industry
  • Submersible pumps


EN 12756


Seal face: Carbon graphite antimony impregnated (A),
Carbon graphite resin impregnated (B),
Silicon carbide (Q1)
Seat: Silicon carbide (Q1 , Q2),
Aluminium oxide (V)
Elastomer: NBR (P), EPDM (E), FKM (V),
Metal parts: CrNiMo steel (G)

Performance Capabilities

Shaft diameter: d1 = 10 ... 100 mm (0.375" ... 4")
Pressure: p1 = 12 bar (174 PSI),
vacuum up to 0.5 bar (7.25 PSI), up to 1 bar (14.5 PSI)
with seat locking
Temperature: t = -20 °C ... +140 °C (-4 °F ... +284 °F)
Sliding velocity: V g = 10 m/s (33 ft/s)
Axial movement: ± 0.5 mm


A modular principle comprising a bellows unit for each shaft diameter and a corresponding cylindrical spring for individual length compensation to l 1 installation length. The UG943 can also be used as a multiple seal in tandem or in a back-to-back arrangement. The entire UG943 series is available in metric and inch sizes


Standard Cartridge Seals
Mechanical Seals As Per API 682
Split Seals
Engineered Seals For Demanding Applications
Standard Mechanical Seals For Pumps & Compressors
Mechanical Seals For Agitators, Mixers, Kneaders & Reactors
Supply Systems & Components
Gas Lubricated Seals for Pumps & Agitators
API 682 / ISO 21049
Technical Information