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.

131 Products showing for Positive Displacement Pumps

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Stocked by manufacturer
SMC Diaphragm Air Positive Displacement Pump, 20L/h, 1.05 Mpa
  • RS stock no. 426-485
  • Mfr. Part No. PA3110-03
Subtotal (1 unit)
R 11 760,69(exc. VAT)
R 11 760,69/unit
Stocked by manufacturer
SMC Diaphragm Air Positive Displacement Pump, 20L/h, 1.05 Mpa
  • RS stock no. 426-486
  • Mfr. Part No. PA3110-F03-N
Subtotal (1 unit)
R 11 760,69(exc. VAT)
R 11 760,69/unit
Temporarily out of stock
ProMinent Positive Displacement Pump, 80L/h, 253V ac, 90 V ac
  • RS stock no. 180-9205
  • Mfr. Part No. DCCAW006PR0010EN
Subtotal (1 unit)
R 17 847,21(exc. VAT)
R 17 847,21/unit
Temporarily out of stock
SMC Diaphragm Automatically Operated Vacuum Pump, 60L/min, 0.7 Mpa, 24V dc
  • RS stock no. 869-374
  • Mfr. Part No. PA5120-F06
Subtotal (1 unit)
R 15 731,91(exc. VAT)
R 15 731,91/unit
Temporarily out of stock
ProMinent Diaphragm Solenoid Positive Displacement Pump, 20L/h, 10 bar, 230V
  • RS stock no. 195-3560
  • Mfr. Part No. GXLAEU1020PVT20000U11130EN
Subtotal (1 unit)
R 73 382,20(exc. VAT)
R 73 382,20/unit
Temporarily out of stock
Verder Peristaltic Positive Displacement Pump, 233.7ml/min, 2 bar
  • RS stock no. 185-6111
  • Mfr. Part No. 162.1113
Subtotal (1 unit)
R 7 763,35(exc. VAT)
R 7 763,35/unit
Temporarily out of stock
Verder Peristaltic Electric Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6145
  • Mfr. Part No. 164.0032
Subtotal (1 unit)
R 4 418,58(exc. VAT)
R 4 418,58/unit
Temporarily out of stock
Verder Peristaltic Electric Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6134
  • Mfr. Part No. 164.0165
Subtotal (1 unit)
R 4 419,33(exc. VAT)
R 4 419,33/unit
Temporarily out of stock
Verder Peristaltic Electric Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6132
  • Mfr. Part No. 164.0149
Subtotal (1 unit)
R 4 419,48(exc. VAT)
R 4 419,48/unit
Temporarily out of stock
Verder Peristaltic Electric Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6144
  • Mfr. Part No. 164.0031
Subtotal (1 unit)
R 4 418,58(exc. VAT)
R 4 418,58/unit
Temporarily out of stock
Verder Peristaltic Electric Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6146
  • Mfr. Part No. 164.0047
Subtotal (1 unit)
R 4 419,33(exc. VAT)
R 4 419,33/unit
Temporarily out of stock
Verder Peristaltic Electric Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6133
  • Mfr. Part No. 164.0164
Subtotal (1 unit)
R 4 419,33(exc. VAT)
R 4 419,33/unit
Temporarily out of stock
SMC Single Acting Pump (Pb Series), Compact Single Acting (Pax1000), Double Acting Pump (Pa Series) Air, Automatically
  • RS stock no. 126-0253
  • Mfr. Part No. PA3210-F03
Subtotal (1 unit)
R 20 895,16(exc. VAT)
R 20 895,16/unit
In Stock
Verder Peristaltic Electric Positive Displacement Pump, 0.06L/min, 1 bar, 12V dc
  • RS stock no. 705-6684
  • Mfr. Part No. AU R2550030 RS1
Subtotal (1 unit)
R 4 312,45(exc. VAT)
R 4 312,45/unit
Temporarily out of stock
SMC Diaphragm Automatically Operated Positive Displacement Pump, 200L/min, 7 bar
  • RS stock no. 196-1156
  • Mfr. Part No. PA3120-03
Subtotal (1 unit)
R 9 367,74(exc. VAT)
R 9 367,74/unit
Temporarily out of stock
ProMinent Diaphragm Electric Positive Displacement Pump, 63L/h, 7 bar, 240V
  • RS stock no. 195-3557
  • Mfr. Part No. S1CBH07065PVTS070U111000EN
Subtotal (1 unit)
R 85 751,73(exc. VAT)
R 85 751,73/unit
Temporarily out of stock
SMC Diaphragm Automatically Operated Positive Displacement Pump, 300L/min, 7 bar, 24V dc
  • RS stock no. 237-3640
  • Mfr. Part No. PA5110-F06
Subtotal (1 unit)
R 19 691,81(exc. VAT)
R 19 691,81/unit
Temporarily out of stock
SMC Diaphragm Automatically Operated Pump, 50L/min, 0.7 Mpa
  • RS stock no. 869-375
  • Mfr. Part No. PA5220-F04
Subtotal (1 unit)
R 39 228,56(exc. VAT)
R 39 228,56/unit
Temporarily out of stock
SMC Diaphragm Automatically Operated Pump, 50L/min, 0.7 Mpa
  • RS stock no. 869-377
  • Mfr. Part No. PA5220-F06
Subtotal (1 unit)
R 39 228,56(exc. VAT)
R 39 228,56/unit
In Stock
Verder Peristaltic Pump Positive Displacement Pump, 375ml/min, 1 bar, 24V dc
  • RS stock no. 185-6140
  • Mfr. Part No. 164.0014
Subtotal (1 unit)
R 4 418,88(exc. VAT)
R 4 418,88/unit
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