Positive Displacement Pumps

Positive displacement pumps are speciality pumps that provide an approximate constant flow of fluid at the fixed speed. Pump trap a fixed amount of the fluid and then force it into a discharge pipe. Positive displacement pumps can produce the same flow at a given speed (RPM) no matter what the discharge pressure is. These type of pumps cannot operate against the closed valve because they have no shutoff head like centrifugal pumps. Positive displacement pumps constantly produce flow and the pressure built within the blocked line will damage the line, pump or both.

The positive displacement pumps can be divided into two main categories: reciprocating positive displacement pumps and rotary pumps.

Rotary pumps are very efficient because they can operate even with highly viscous fluids but require a slow steady speed rotation. If the mechanism rotation is too fast, the fluid can cause erosion, which eventually causes enlarged clearances that liquid can pass through and reduce pressure.

Rotary pumps can be divided into three main types:

  • Gear pumps: the simplest pump type that pumps liquid using 2 gears.
  • Screw pumps: more complicated pump type where the two screws are positioned against each other to pump the liquid.
  • Rotary vane pumps: these pumps have a cylindrical rotary engine. As the rotor circulates, vans trap fluid between the rotor and the engine housing, pushing the liquid through the pump.

150 Products showing for Positive Displacement Pumps

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In Stock
RS PRO Diaphragm Electric Positive Displacement Pump, 380ml/min, -500/800 mBar, 1.5V, 5 V
  • RS stock no. 702-6898
Subtotal (1 unit)
R 4 231,55(exc. VAT)
R 4 231,55/unit
In Stock
RS PRO 4 Piston on Demand Diaphragm Positive Displacement Pump, 17L/min, 2.7 bar, 12V
  • RS stock no. 326-881
Subtotal (1 unit)
R 4 631,21(exc. VAT)
R 4 631,21/unit
In Stock
RS PRO Submersible Electric Positive Displacement Pump, 18L/min, 1 bar, 12V
  • RS stock no. 326-883
Subtotal (1 unit)
R 1 515,61(exc. VAT)
R 1 515,61/unit
In Stock
Verder Peristaltic Electric Positive Displacement Pump, 1310ml/min, 265V ac, 85 V ac
  • RS stock no. 125-4049
  • Mfr. Part No. 148.1021
Subtotal (1 unit)
R 59 815,68(exc. VAT)
R 59 815,68/unit
Stocked by manufacturer
Verder Peristaltic Pump Pump, 4000ml/min, 4 bar, 240V
  • RS stock no. 764-229
  • Mfr. Part No. 155.9.0020
Subtotal (1 unit)
R 2 367,11(exc. VAT)
R 2 367,11/unit
Temporarily out of stock
Verder Peristaltic Pump Pump, 4000ml/min, 4 bar, 240V
  • RS stock no. 764-231
  • Mfr. Part No. 155.9.0022
Subtotal (1 unit)
R 2 272,11(exc. VAT)
R 2 272,11/unit
Stocked by manufacturer
Verder Peristaltic Pump Pump, 4000ml/min, 4 bar, 240V
  • RS stock no. 764-230
  • Mfr. Part No. 155.9.0021
Subtotal (1 unit)
R 2 493,97(exc. VAT)
R 2 493,97/unit
Temporarily out of stock
Xylem Flojet Diaphragm Electric Positive Displacement Pump, 3.8L/min, 2.4 bar, 24V dc
  • RS stock no. 705-9330
  • Mfr. Part No. RLFP222202D
Subtotal (1 unit)
R 2 625,63(exc. VAT)
R 2 625,63/unit
In Stock
Verder Peristaltic Electric Positive Displacement Pump, 0.6L/min, 1 bar, 265V ac, 85 V ac
  • RS stock no. 705-6678
  • Mfr. Part No. 148.1011
Subtotal (1 unit)
R 40 466,03(exc. VAT)
R 40 466,03/unit
Stocked by manufacturer
Verder Peristaltic Pump Pump, 4000ml/min, 4 bar, 240V
  • RS stock no. 764-235
  • Mfr. Part No. 155.9.0025
Subtotal (1 unit)
R 7 376,26(exc. VAT)
R 7 376,26/unit
In Stock
ProMinent Diaphragm Electric Positive Displacement Pump, 1.1L/h, 16 bar, 100V, 230 V
  • RS stock no. 121-8586
  • Mfr. Part No. BT4B1601PVT2000U1110000
Subtotal (1 unit)
R 26 835,94(exc. VAT)
R 26 835,94/unit
In Stock
ProMinent Peristaltic Electric Positive Displacement Pump, 2.4L/h, 1.5 bar, 230V
  • RS stock no. 121-8600
  • Mfr. Part No. DF2A0224P00A10W1
Subtotal (1 unit)
R 13 015,37(exc. VAT)
R 13 015,37/unit
In Stock
Hanna Instruments Diaphragm Electric Positive Displacement Pump, 10.8L/h, 43.5 psi, 110V ac, 115 V ac, 220 V ac, 240 V
  • RS stock no. 144-850
  • Mfr. Part No. BL10-2
Subtotal (1 unit)
R 6 723,63(exc. VAT)
R 6 723,63/unit
In Stock
Verder Peristaltic Electric Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6136
  • Mfr. Part No. 164.0166
Subtotal (1 unit)
R 4 419,33(exc. VAT)
R 4 419,33/unit
Stocked by manufacturer
SMC Diaphragm Air Positive Displacement Pump, 45L/h, 1.05 Mpa
  • RS stock no. 426-491
  • Mfr. Part No. PA5110-F06-N
Subtotal (1 unit)
R 16 937,45(exc. VAT)
R 16 937,45/unit
In Stock
ProMinent Diaphragm Air Positive Displacement Pump, 650L/h, 7 bar
  • RS stock no. 179-7499
  • Mfr. Part No. 1010797
Subtotal (1 unit)
R 35 810,10(exc. VAT)
R 35 810,10/unit
In Stock
Verder Peristaltic Electric Positive Displacement Pump, 15.0L/min, 1 bar, 230V ac
  • RS stock no. 705-6659
  • Mfr. Part No. AU ES3R16
Subtotal (1 unit)
R 2 893,11(exc. VAT)
R 2 893,11/unit
In Stock
Verder Peristaltic Electric Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6131
  • Mfr. Part No. 164.0148
Subtotal (1 unit)
R 4 418,88(exc. VAT)
R 4 418,88/unit
In Stock
ProMinent Diaphragm Electric Positive Displacement Pump, 19L/h, 2 bar, 100V, 230 V
  • RS stock no. 121-8590
  • Mfr. Part No. BT4B0220PVT2000U1110000
Subtotal (1 unit)
R 27 929,64(exc. VAT)
R 27 929,64/unit
In Stock
Verder Peristaltic Electric Positive Displacement Pump, 0.24L/min, 1 bar, 12V dc
  • RS stock no. 705-6671
  • Mfr. Part No. AU R2550120 RS1
Subtotal (1 unit)
R 4 289,65(exc. VAT)
R 4 289,65/unit
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