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Type SAF

Double-acting Cartridge Seal for Heavy Equipment

The SAF is a double-acting seal particularly engineered to suit pumps, screens, knotters, sorters and pulpers in heavy process industries where liquids containing solid particles and impurities are involved. Seal design can be multi-component or cartridge version, depending on application. Size range varies from 0.787'' to 17.716''/20mm to 450mm.

Typical OEM designs include brands: Andritz, Beloit, Bird, GL&V, IMPCO, Metso Paper, Netsch Mohno, Noss, Voith, Toscotec,SSP Pumps, Sulzer Pumps, Sunds Defibrator and Warman Pumps, etc.

Design is unaffected by pressure changes. The Type SAF seal is double-balanced, which makes the construction fully independent of pressure changes in both process and barrier fluid. It's designed for minimum damage risk — the rugged construction for all applications prevents failure and provides long and trouble-free service. Type SAF seal provides easy installation and low maintenance costs. Ultimate reliability for screen sealing requirements. It is recommended to use Safeunit (plan 54) for seal water control.



  • Balanced, heavy-duty design
  • Easy to install
  • No fitting parts needed
  • No measuring required
  • Self-centering


Temperature Limits


Pressure Limits

Stuffing box pressure: 290 psi(g)/20 bar(g)

Seal water pressure: 215 psi(g)/15 bar(g)

Speed Limits


Standard Materials

Seal faces: SiC/SiC (product side), SiC/Carbon (atmosphere side)

O-rings: PTFE (product side), EPDM, Viton

Metals: AISI 329 (standard), titanium, UHB

Springs: Nimonic steel

Recommended Applications

  • Process Pumps

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