Mechanical seal john crane
Type SBW
Heavy-duty Single-cartridge Seals with Non-pressurized Quench – Type SBW
The Safeseal Type SBW is a single-cartridge seal used with unpressurized quench. The Type SBW seal can be used in many general industry applications. The option to use Type SBW with grease quench makes this seal suitable to be used in mines and other applications where seal water is not available. The design ensures reliable performance and longevity under demanding conditions. Typical applications include paper stock pumps in the paper industry and high-temperature condensate. The Type SBW cartridge seal fits other process equipment, such as agitators, in addition to pumps.
The variant of the design available for different services:
Type SBWG — a single cartridge seal used with grease quench
Product Description Type SBW
At John Crane, we partner with you to find solutions that will best ensure optimal function of your machinery in any application. Our range of heavy duty cartridge seals are versatile and easy to install, suit a wide range of duties and are commonly used in applications in paper and board mills, power plants and other process equipment. The SB1A and SB2A ranges are suited for ANSI specific pumps.
Advanced technical features, such as patented seal face holders and elastic thrust rings, decrease the risk of seal damage and extend seal life. The balanced design of the SB1 ensures that pressure shocks do not affect seal operation, providing ultimate reliability. The SB1A is suitable for a wide range of demanding applications including water, oils, solvents and pulp with consistency of up to 2 percent. The SB2 and SB2A provide the longevity and reliability needed for the most demanding and abrasive applications, reducing risk of damage to your equipment and operators
Table Parameters Type SBW
| Temperature Limits | SBW: 300°F/150°C
SBWG: 150°F/65°C
|
|---|---|
| Pressure Limits | SBW process pressure: 215 psi(g)/15 bar(g)
Seal water pressure: 7 psi(g)/.5 bar(g)
|
| Speed Limits | 65fps/20m/s
|
| Standard Materials | Seal faces: SiC/Carbon or SiC/SiC
O-rings: PTFE, EPDM, Viton, FFKM
Metals: AISI 329 and 316 standard, titanium, Hastelloy, UHB
Springs: Nimonic steel, Hastelloy C 276 |
Features Type SBW
- California Residents: PROPOSITION 65 WARNING
- Balanced design — sudden changes in pressure do not affect seal function.
- Springs are located in the stationary part of the seal, in the seal water; shaft misalignment will not vibrate the springs or wear out the O-rings. The seal water washes the springs.
- Cartridge design — no measurements necessary for installation, easy to install, reduces possibilities of human error.
- No drive pins in contact with faces — no face-cracking during start-up.
- Available in different materials — selection covers all single applications.
- Unpressurised water quench — at high temperatures, the seal is cooled with an unpressurised (quench) wash. A V-ring prevents wash water leakage.
Recommended Applications Type SBW
- Process pumps
- Other rotating equipment