Mechanical seal john crane
Type SEW
Single Mechanical Seals for Sulzer Process Pumps – Type SEW
Type SEW is a seal operating on a non-pressurized water quench principle. It is designed for the most demanding applications in the pulp industry, where reliable and long-lasting operation is required from a seal. Typical applications include stock pumps at pulp mill washing and screening facilities, as well as high-temperature condensate pumps.
Table Parameters Type SEW
| Temperature Limits | 300°F/150°C
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|---|---|
| Pressure Limits | Process pressure: 215 psi(g)/15 bar(g)
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| Speed Limits | 65fps/20m/s
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| Standard Materials | Seal faces: SiC/Carbon or SiC/SiC
O-rings: PTFE, EPDM, Viton
Metals: AISI 329 (standard), titanium, UHB
Springs: Nimonic steel
V-ring: Nitrile
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Features Type SEW
- California Residents: PROPOSITION 65 WARNING
- Balanced design — undisturbed operation even with sudden pressure shocks.
- Heat shrunk seal faces — ensures correct face alignment at all temperatures recommended for this seal.
- Spring located in a stationary body — shaft misalignment does not pump up the spring or wear out the O-ring.
- Installation against the shaft shoulder — easy installation reduces risk of human error. No measurements required for installation.
- No drive pins at seals — seal face does not crack at start-up.
- Available in different materials — selection covers all possible single-seal applications.
- Non-pressurized seal water quench — possible to cool seal with non-pressurized seal water at high temperatures. A V-ring prevents water leakage from the seal.
- By using a Sulzer Scanpump cartridge tool, the seal becomes a true cartridge seal.
- Available with grease lubrication — the Safeseal Type SEW can be used with grease quench to save seal water.
Recommended Applications Type SEW
- Process pumps
- Other rotating equipment