Troubleshooting

The Progressive Cavity Pump and It's Geometry

A progressive cavity pump is a type of positive displacement pump and is also known as a progressing cavity pump, eccentric screw pump or cavity pump. PCP systems use a rotor and stator system that, once turned, causes the cavities to progress upward and move fluid from the intake to the discharge end of the pump.

Rotors are made of Hardened Steel or Stainless Steel and are covered with a Chrome Plating to give resistance to corrosive and abrasive materials. The Rotor forms a single helix and rotates eccentrically in the Stator.

Stators are metal tubes with internally molded cavities of Synthetic or Natural Rubber. The Stator has a double helix cavity double the total volume of the rotor.

---

Application Variables: "The Major Three"

Abrasion Effects

Wear is proportional to speed; minimize speed to minimize wear. De-rate pressure per stage to limit slip amount.

Characteristic	Fluids	Press / Stage
None	Water, Polymer, Oil	6 Bar
Light	Milk or Lime	4.5 Bar
Medium	Sludge, Clay, Chocolate	3 Bar
Heavy	Grout, Sand, Granulated Sugar	1.4 Bar

Temperature Effects

• Stator Elastomers swell from 70 to 130°C.
• Metal parts expand/contract at a negligible rate.
• Under extreme temperatures, Metal Rotor/Stator combinations are used.

Viscosity & Speed Table

Material	Viscosity (CPS)	Max RPM
Water	1-5	Above 1800
Motor Oil SAE 30	150-200	700
Honey	2,000-3,000	150
Tomato Paste	150,000+	30

---

How does a SYNO Pump work?

The standard PC Pump consists of a Rotor (metal) which rotates within an elastomeric Stator. This motion creates cavities that progress from suction to discharge, moving product and building pressure.

Advantages Of SYNO Pumps

• Low sheer, metered and pulse-less flow.
• Handles "water-like" to super viscous fluids.
• Gently pumps large particulates and abrasive solids.
• Excellent suction capabilities (No air lock).