Shuttle Block Pump ( Series SL ) 

TUSHACO Shuttle Block series employs a unique pumping principle - a combination of Rotary and Piston Pump. Two double acting pistons in their respective cylinders at right angles to each other accomplish this, while the rotor turns without the need for any valving. The Shuttle Block pump is a self-priming Rotary pump.

There are only three pumping elements - Rotor, Piston and Shuttle. Rotor is keyed to a single shaft and runs concentric in pump casing. It has a rectangular slot across its face.

The channel-shaped piston reciprocates within this slot. A rectangular block, shuttle, fits liquid tight in piston slot and reciprocates. The reciprocating action of piston in rotor turns in the pump casing.

Like a true piston pump, this pump can handle highly viscous liquids or thin volatile material with unmatched suction characteristics and yet smoothly without pulsation. This pumping principle - unlike centrifugal or gear pumps - gently handles the product without breaking it down, emulsifying, foaming, chewing or heating: an added advantage at no extra cost. Such a simple construction has resulted in extremely rugged and maintenance-free pumps with very low noise levels. Most of the difficult pumping problems can be overcome by a Shuttle Block Pump.

1. Piston type pumping action with only four overlapping strokes per revolution contributes to excellent suction. Very high viscosity fluids including pasty and lumpy substances can be pumped with ease.
    
2. Single shaft design with one long sleeve-bearing support and external ball bearing ensures vibration-free smooth running and also permits the use of belt/ chain drives. Bearing does not get contaminated with pumping fluid.
    
3. Pump elements can be inspected and serviced at installation by ‘Front Pull Out’ design without the need to disconnect pipes, coupling or motor or any other parts by simply unscrewing the cover bolts.
    
4. Large contact areas between rotor elements result in low unit pressures and less wear and tear unlike in gear pumps. The elements are in hydrodynamic balance.
    
5. Slow speed operations contribute to high reliability and excellent service life without the need for maintenance.
    
6. Shuttle block pumping principle gently moves the product without shear, foaming, agitating, heating, emulsifying or chewing - a positive advantage over conventional gear rotary pumps.
    
7. Pumping elements are of simple geometric form. In an emergency these parts can be locally manufactured by any small repair shop without having to shut down the plant.
    
8. Volumetric efficiency is very high, contributing to low power requirements due to piston action.
    
9. Single gland construction even with external bearings reduces leakages to minimum, unlike four glands required in gear or screw pumps for comparable service.
    
10. Micrometer axial shaft positioning device permits controlled clearance between rotor face and cover and even after long use, wear can be compensated by simple adjustment at site to restore pumping capacity. (Practically impossible in other designs like gear/ vane/ or screw pumps).

Shuttle block pumps can be supplied in various materials like cast iron/steel/bronze or combination. The pumps can be provided with jacket for heating or cooling and this can be done even on existing installation. Shaft sealing is normally packed gland but mechanical seal can also be provided.

All shuttle block pumps are designed for direct drives or through vee belts, or chain drives without the need for additional bearings supports.

Loading, unloading, transfer, circulation and process pumping of a very wide range of products typically as thin as diesel oil to extremely viscous substances like chocolate. Common applications include unloading of tank lorries and railcars, loading of railcars, tank lorries and barrel filing. For tank to tank transfer and process pumping, the shuttle block pumps can handle situations very successfully where normal gear pumps or sophisticated screw pumps may fail to perform.

Bitumen, Caustic Soda, Chocolate, Corn Syrup, Coal Tar Pitch, Crude Oil, Enamel, Edible Oils, Fatty Acid, Fuel Oil (LDO, LSHS, HHS, RF, O), Glue-hot, Grease, Kerosene, Lacquer, Lard-hot, Linseed Oil, Lubricating Oil, Molasses, Naphtha, Palm Oil, Paint, Petroleum, Printing Ink, Resin, Shellac, Soap Liquor, Sodium Silicate, Starch, Sugar Syrup, Tar, Turpentine, Varnish, Wax, etc.