The U Series has the same hydraulic performance profiles of their lined counterparts in the S and L Series, and can be applied on existing lined slurry pump installations using a conversion kit.
Impellers – Uses the same high chrome impellers as the lined pump series for even greater interchangeability – pump out vanes on rear and front (on closed impellers) reduce recirculation within pump – optional castings of straight or semi-Francis vanes (from 2 to 6 vanes on certain sizes) offer wider hydraulic options in single sizes.
Bowl/Casing – The unlined casing is extra thick high-chrome alloy material hardened to over 650 Brinnell. The suction side is cast in a contoured shape to mate with the impeller eyes to increase efficiency and reduce recirculation in the casing.
Expeller (Centrifugal Seal) – no external sealing water required where applicable
Stuffing Box – flushed gland sealing with braided packing and a lantern ring
Mechanical Seals
Cartridge-style bearing housing allows for removal from pump and assembly in controlled environment
Oversized shaft diameters and reduced overhang in the wet-end contribute to long life and reliability in the field
The stuffing box is the original shaft seal for any rotating element through a fixed device. This seal has stood the test of time, and is still one of the most common sealing arrangements in slurry pumps. Seal water must be supplied at a pressure in excess of pump discharge pressure.
A mechanical seal consists of two principle components. One component is stationary and the other rotates against it to achieve a seal. There are many types of mechanical seals, ranging from simple single spring designs to considerably more complex cartridge seal types, which are the type most commonly applied on slurry pumps. The design, arrangement and materials of construction are essentially etermined by the pressure, temperature, speed of rotation and product being sealed (the slurry).
The Schurco expeller seal can operate completely leak free during pump operation.
The expeller rides along the shaft and expels material from the expeller ring cavity. Consideration must be given to inlet pressure and pump speed to ensure proper sealing with this type of seal arrangement. The typical installation introduces grease in lieu of seal water to provide a static seal against the inlet pressure when the pump is not operating.
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