Progressive Cavity Pumps – Feature

Bellin progressive cavity pumps have been designed for easy, low maintenance: wear parts can easily be replaced on the site. Eccentric screw pumps are heavy duty pumps and they can be used to pump abrasives sludges, viscous products, oils, emulsions etc. Due to the steady non turbulent flow they can also handle shear sensitive products and medium with solids content without breaking up the solids.

cavity


ADVANTAGESBellin progressive cavity pumps have many advantages over other types of pumps which allow use extremely diverse:

  • self priming up to 7-8 mt
  • low speed and so longer pump life (200-500 r.p.m. in comparison to 1400-2800 r.p.m of the centrifugal pumps)
  • suitable to transfer abrasive and higly viscous products
  • steady flow with minimum pulsation and low shear effects
  • high abrasion resistance
  • minimum maintenance
  • low noisy
  • capacity up to 260 mc/h
  • pressure up to 30 bar
  • direct relation between conveying capacity and speed makes the Bellin pumps suitable also for dosing purposes.
 Pump “PRESSURE” depends on the number of rotor/stator stages:  
    
 1 stadio_pag81 STAGE:
up to 6-7 BAR
 
 2 stadi_pag82 STAGES:
up to 12-14 BAR
 
 4 stadi_pag84 STAGES:
up to 24-28 BAR
 
    

 


 

OPERATING PRINCIPLE

The “progressive cavity pumps” are “positive displacement” pumps. The 2 principal parts are the “rotor” (round thread screw) which turns eccentrically inside a fixed rubber part, the “stator” (vulcanized rubber into a steel cylinder) – moving the fluid in a series of cavities along the axis of the pump.

 

 

“Theoretical capacity” is in relation to the pump speed and to rotor dimension. Theoretical capacity is as below:

Qth = 4*e*D*Ps*n*60

This means

  • Qth Theoretical capacity [me = Eccentricity of rotor [m>[/m