Single Screw Pumps

delta progressing cavity pump is a positive displacement single screw rotary pump. The pumping elements 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 pulsation less 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 delta progressing cavity pumps to handle gaseous and low viscosity liquids. 
the pressure capabilities of the pump are a function of the number of cavities. Delta progressing cavity pumps are available in a wide variety of materials - cast iron or stainless steel wetted parts and 10 standard elastomer materials. Delta’s 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 delta’s progressing cavity pumps.
salient features

sturdy drive design provides strength for rigorous continuous operation.
unique joint design is very simple and maintenance free joint, does not require replacement due to wear and tear, common in other joint designs
maintenance friendly design of the pump enables complete maintenance of the pump without removing the suction and discharge pipelines.
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)
technical parameters
capacity: 5 to 2700 lpm
differential pressure: 24 bar max.
temperature: from cryogenic to 100°c
viscosity range: 1 to 100,000 cp

drive arrangements possible:
direct drive with motor
through gear box
v-belt pulleys
variable speed drives
special drives such as hydraulic, with i.c. Engines.