Seal Faces: Carbon graphite, SiC, TC (tungsten carbide), Al₂O₃
Secondary Seals:
58U: PTFE wedge (for strong chemicals, high temp)
59U: NBR, EPDM, FKM (Viton), FFKM
Springs & Metal Parts: 304, 316L, Hastelloy C‑276
MOR 58U and 59U are classic, single‑end, multi‑spring, unbalanced mechanical seals conforming to DIN 24960, EN 12756, ISO 3069 standards. They are compact, versatile, and widely used in chemical pumps, centrifugal pumps, and process equipment handling corrosive, neutral, and low‑to‑medium pressure fluids.
58U Mechanical Seal
Structure: Single‑end, multi‑spring, unbalanced, PTFE wedge secondary seal
Drive: Bolt/lug or drive sleeve transmission
Axial length: Very short, compact footprint
Rotation: Bi‑directional (no orientation needed)
Compensation: Pre‑assembled multi‑springs for uniform face loading and shaft run‑out compensation
59U Mechanical Seal
Structure: Single‑end, multi‑spring, unbalanced, elastomer O‑ring secondary seal
Drive: Bolt/lug or drive sleeve transmission
Axial length: Very short, same mounting dimensions as 58U
Rotation: Bi‑directional
Compensation: Multi‑springs isolated from process fluid
Key Distinction: 58U uses PTFE wedge for extreme chemical resistance; 59U uses rubber O‑rings for general‑purpose sealing.
Compact Multi‑Spring Design: Uniform face loading, compensates shaft run‑out, anti‑clogging
Unbalanced Configuration: Simple, cost‑effective for medium‑pressure applications
Easy Installation: Pre‑assembled, bi‑directional, short axial fit
Broad Chemical Compatibility:
58U: Excellent for corrosive, high‑temp, and aggressive fluids
59U: Ideal for general chemical, water, and oil services
Interchangeable: Direct replacements for John Crane 58U/59U and other OEM seals
Applications
Chemical centrifugal pumps
Process pumps for acids, alkalis, solvents
Water, wastewater, and pulp & paper pumps
Pharmaceutical, food, and petrochemical equipment
Vacuum pumps, compressors, and reaction kettles
Hot Tags: MOR 58U 59U Mechanical Seal for Centrifugal Pump, China MOR 58U 59U Mechanical Seal for Centrifugal Pump suppliers, factory, centrifugal pump double mechanical seal, HJ92N mechanical seal, m7n mechanical seal, multi-spring mechanical seal, single coil mechanical seal, type 2 mechanical seal
