Type SB1A O-ring Pusher Seals | John Crane Mechanical Seals
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Type SB1A

Single, Heavy-duty Cartridge Seals

The Safeseal Type SB1A is a single-cartridge seal for use with clean fluids and lubricants. It is versatile, easy to install and maintain. Although the design of the seal is simple, it contains advanced technical features, such as patented seal face holders and elastic mating ring. Seal faces are installed using a patented heat shrink process ensuring correct, distortion-free face alignment at all recommended temperatures. The Type SB1A seal is applicable for a wide range of duties such as water, oil, solvents and pulp.
Several variant of the design available for different services:

Type SB1 — Single, balanced cartridge seal, metric units (DIN)
Type SB1A — Single, balanced cartridge seal, imperial units (ANSI)

Type SB1B — Single, balanced cartridge seal, imperial units for big box bore pumps. The Type SB1B flange is designed to fit bigger stuffing box diameters.

Type SB1S — Single, balanced cartridge seal, imperial or metric units. Metric versions of SB1A seals are also called SB1S.

Recherche de documents


  • California Residents: PROPOSITION 65 WARNING
  • The springs are located in the stationary body of the seal, reducing risk of the springs becoming clogged.
  • PTFE slot rings replace the traditional O-rings in places where they are exposed to the product, preventing sticking.
  • Protected faces, the seal face carriers are driven by machined fits, preventing metal stress from distorting the face.


Limites de température

250 °F/120 °C

Limites de pression

Pression de service du type SB1 : 215 psi(g)/15 bar(g)

Type SB1A, SB1B, SB1S pression du processus : 290 psi(g)/20 bar(g)

Limites de vitesse

65 pi/s/20 m/s

Matériaux standard

Faces de la garniture : SiC/Carbone ou SiC/SiC

Joints toriques : PTFE, EPDM, Viton, FFKM

Métaux : AISI 329 et 316 standard, SAF 2507 pour les applications en eau de mer, titane, Hastelloy, UHB

Ressorts : Acier Nimonic ou Hastelloy, C276

Applications recommandées

  • Pompes de traitement
  • Autres équipements rotatifs

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