This progressing cavity screw pumps filter press explains what to check before you buy, so you can compare options with confidence.
Progressing cavity pumps (also called PC pumps, mono pumps, or screw pumps) move high-viscosity sludge and shear-sensitive fluids with a steady, pulse-free flow — making them the standard choice for filter press feed lines and municipal sludge transfer where centrifugal pumps fail.
Progressing Cavity Screw Pumps Filter Press: How a Progressing Cavity Pump Works
Inside the pump body, a single helical rotor (typically hardened steel) turns inside a double-helix elastomer stator. As the rotor turns, a chain of sealed cavities moves from inlet to discharge, displacing a fixed volume per revolution. The result: a near-constant flow regardless of discharge pressure, plus very low shear (around 4-12 s⁻¹ shear rate) which preserves floc structure in dewatering applications.
Typical Senjie PC pumps handle viscosities up to 100,000 cP, solids content up to 50%, and discharge pressures to 24 bar (348 psi) per stage — enough to feed even the highest-pressure membrane filter presses.
When to Choose PC Pumps Over Alternatives
Specify a PC pump when one of these matters: (1) you need accurate, repeatable metering for chemical dosing; (2) the fluid contains long-fiber or stringy solids that clog impeller pumps; (3) the slurry is shear-sensitive (polymer-flocculated sludge); (4) you need to pump uphill against high pressure with consistent flow. For abrasive slurries with high silica content, centrifugal slurry pumps or ceramic piston pumps last longer.
Common Applications
- Municipal sludge dewatering — feeding polymer-flocculated sludge into chamber filter presses without breaking floc
- Industrial wastewater — biological sludge, primary clarifier sludge, DAF float
- Food & beverage — fruit pulp, mash, brewery yeast, vinegar lees
- Chemical industry — high-viscosity intermediates, pigment slurries, catalyst recovery
- Pharmaceutical — fermentation broth, mycelium suspensions
Specifications & Customization Options
- Capacity: 0.5 – 80 m³/h (multi-stage to 150 m³/h)
- Discharge pressure: 6 / 12 / 18 / 24 bar (1-4 stage models)
- Max viscosity: 100,000 cP
- Max temperature: 120°C standard, 180°C with FKM stator
- Rotor materials: Hardened tool steel, chrome plated, tungsten carbide coated
- Stator materials: NBR, EPDM, FKM (Viton), HNBR for hydrocarbons
- Drive: SEW or Siemens geared motors, variable-frequency control
FAQs
Why is my PC pump losing flow at constant RPM? The stator is worn — replace it. Stator life depends mainly on abrasive content and the rubber compound. With clean water, expect 20,000+ hours; with abrasive sludge containing sand, 2,000-6,000 hours.
Can a PC pump run dry? Only briefly. The rotor-stator interference fit creates friction heat very quickly — running dry for more than 30 seconds typically burns the stator. Always install a low-flow shutdown sensor.
What’s the right RPM for filter press feeding? Run slow during the initial fill (200-300 RPM) to avoid cake-cracking, then ramp up to design RPM (500-900 RPM) once chambers are partially filled. Variable-frequency drives are essentially required.
Need help sizing a PC pump? Talk to Senjie’s engineering team with your sludge viscosity, dry solids content, target pressure, and filter press model — we’ll match a PC pump from our screw pump catalog to your duty point.
For general background, see industrial pump technology.
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