John Crane Safematic Type SEW Cartridge Mechanical Seal for Sulzer APP APT Pumps

Type SEW is a seal operating on a non-pressurised water rinsing (quench) principle, and 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. Type SEW seal is especially designed for Sulzer APP and APT pump series.

Features and benefts

• Balanced design - Undisturbed operation even with sudden pressure shocks.
• 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-pressurised seal water rinsing (quench) - Possible to cool seal with non-pressurised seal water at high temperatures.V-ring prevents water leakage from the seal.

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