Progressing Cavity Pumps

Design and Operation

Tushaco progressing cavity pumps is a positive displacement rotary pump. The actual pumping elements of the pump are rotor and stator. The single helical rotor rolls eccentrically in a double threaded helix stator of twice the pitch length. A series of sealed cavities 180° apart are created that appear to progress from suction to discharge during one rotation of rotor.

The opposing cavities fill and empty simultaneously resulting in a pulsationless flow.The fluid travels axially with relatively low velocity and minimal agitation.The stator is made of a resilient elastomeric material and bonded to the stator tube. The important feature of the pumping principle is the ability to handle slurries and solid particles. The elastomer stator also permits passage of solid particles due to elastomeric deformation. The compression fit of the rotor and stator enables the Tushaco progressing cavity pumps to handle gaseous and low viscosity liquids. The pressure capabilities of the pump are a function of the number of cavities. Tushaco progressing cavity pumps are available in a wide variety of materials - cast iron or stainless steel wetted parts and 10 standard elastomer materials. Tushaco versatile progressing cavity pumps are rugged, compact and highly efficient.
Fluids, which are delicate, shear sensitive or abrasive, low or high viscosity, with fibres, with high air content, or large solids, can be conveniently handled by Tushaco progressing cavity pumps
Salient Features

Sturdy drive design provides strength for rigorous continuous operation.
Unique pivot-joint design extends service life and reduces replacement cost.
Close coupled models with built-on speed reducers offer compact pumping unit.
Stators are available in a wide range of elastomers.
Suction lift to 28' w.c. (Water column)
Possible drive arrangements include:

Direct drive with motor
Through gear box
V-belt pulleys
Variable speed drives
Special drives such as hydraulic, with I.C. engines.
Technical Parameters

Capacity:	5 to 2700 lpm
Differential Pressure	6 to 24 bar
Temperature	from cryogenic to 120°C
Viscosity range	1 to 100,000 cp

Typical Industries, Applications & Fluids

INDUSTRIES	APPLICATIONS			FLUIDS
Municipal/ Industrial	Transfer Service Sampling	Polymer Feed Dewatering Sludge Transfer	Chemical Feed	Effluent with & without solids, Milk of Lime	General Sewage Slurry, Media	Protective Chemicals
Industrial	Centrifuge Charging, Transfer, Filter Charging	Kiln Charging Drainage, Metering, Tank Loading/ Unloading	Pit Emptying Gas Scrubbers	Acids, Adhesives, Caustic Soda, Cellulose, Cement Slurry	Dye Liquor, Dye Baths, Flouring, Plaster, Grout,Ink	Lyes, Mortar, Coal Slurry, Lime Slurry
Chemical	Process Transfer	Loading/ Unloading, Metering	Collecting	Acids, Adhesives, Colours, Cosmetics, Detergents	Glue, Lacquers, Hair Oil, Hand Washing	Cream, Paints, Shampoos, Waxes
Food Process & Production	Process Transfer	Loading/ Unloading, Metering	Collecting	Alcoholic Beverages, Apple Puree, Baby Food, Beer, Beet Sludge, Biscuit Dough, Citrus Fruit Masher	Cream Cheese, Edible Oil, Eggs, Raw Fats, Fish Residues, Fruit & Berry Masher, Honey, Ice Cream	Lard, Meat Extract, Milk, Mustard, Tomato Paste, Vegetable Oil, Wine, Yeast
Petrochemical Process & Production	Transfer	Loading/ Unloading	Metering	Crude Oil, Oil Sludge	Oil Tank Residues, Processed Oil	Waste Products
Utilities	Transfer	Loading/ Unloading		Fuel Oil	Coal/ Oil Slurry	Coal/ Water Slurry