ISP SB1 O ring pusher seal
ISP SB1 O ring pusher seal is the well replacement of John crane type SB1 seal.
The Safeseal Type SB1 is a single-cartridge seal for use with clean fluids and lubricants. It is
versatile and 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 SB1 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.
The springs are located in the stationary body of the seal, reducing risk of the springs becoming
PTFE slot rings replace the traditional O-rings in places where they are exposed to the product,
Protected faces, the seal face carriers are driven by machined fits, preventing metal stress from
distorting the face.
Type SB1 process pressure: 215 psi(g)/15 bar(g)
Type SB1A, SB1B, SB1S process pressure: 290 psi(g)/20 bar(g)
Seal faces: SiC/Carbon or SiC/SiC
O-rings: PTFE, EPDM, Viton, FFKM
Metals: AISI 329 and 316 standard, SAF 2507 for sea water applications, titanium, Hastelloy, UHB
Springs: Nimonic steel or Hastelloy, C276