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.

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Description Price Pump Type Drive Type Maximum Flow Rate Maximum Head Maximum Working Pressure Input Connection Output Connection IP Rating Series Maximum Fluid Temperature Body Material Supply Voltage Input Power Wetted Materials
RS Stock No. 705-6662
Mfr. Part No.AU EZ3R16 100 02
BrandVerderflex
SGD555.46
Each
units
Peristaltic Electric 0.375L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -
RS Stock No. 125-4040
Mfr. Part No.AU R1560240 01
BrandVerderflex
SGD788.29
Each
units
Peristaltic Electric 1300ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 144-844
Mfr. Part No.BL 5/D
SGD341.69
Each
units
Diaphragm Electric 5L/h - 101.5 psi - - IP65 BL5/D - Glass Fibre Reinforced PP 220 V, 240 V 200W -
RS Stock No. 185-6135
Mfr. Part No.164.0126
BrandVerderflex
SGD268.31
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6114
Mfr. Part No.162.1128
BrandVerderflex
SGD547.35
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6151
Mfr. Part No.169.6015
BrandVerderflex
SGD146.90
Each
units
- - - - - - - - - - - - - -
RS Stock No. 195-3563
Mfr. Part No.DFXAEU0530SPTU0000U11130EN
BrandProMinent
SGD4,313.13
Each
units
Peristaltic - 30L/h 5m 5 bar - - - DFXA - PVDF 100 → 230 V 45W TPV
RS Stock No. 185-6138
Mfr. Part No.164.0012
BrandVerderflex
SGD282.50
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-7498
Mfr. Part No.PNDB0220PVT2000001
BrandProMinent
SGD1,202.78
Each
units
- Air 16.7L/h - 2 bar - - - - - PVDF - - -
RS Stock No. 185-6149
Mfr. Part No.164.0049
BrandVerderflex
SGD268.31
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6133
Mfr. Part No.164.0164
BrandVerderflex
SGD263.14
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 121-8590
Mfr. Part No.BT4B0220PVT2000U1110000
BrandProMinent
SGD1,752.50
Each
units
- Electric 19L/h - 2 bar 3/4 in G 3/4 in G IP65 BT4B +20°C PVDF 100 to 230 V 15.2 (Consumption)W PVDF
RS Stock No. 144-866
Mfr. Part No.BL 15/D
SGD350.75
Each
units
Diaphragm Electric 15.2L/h - 14.5 psi - - IP65 BL15/D - Glass Fibre Reinforced PP 220 V, 240 V 200W -
RS Stock No. 125-4038
Mfr. Part No.AU R1560125 01
BrandVerderflex
SGD788.29
Each
units
Peristaltic Electric 800ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 121-8596
Mfr. Part No.DLTA1020PVT2000U11131EN0
BrandProMinent
SGD4,182.43
Each
units
- Electric 19.1L/h - 10 bar 3/4 in G 3/4 in G IP65 DLTa +20°C PVDF 100 to 230 V 78 (Consumption)W PVDF
RS Stock No. 185-6152
Mfr. Part No.169.6016
BrandVerderflex
SGD146.90
Each
units
- - - - - - - - - - - - - -
RS Stock No. 125-4036
Mfr. Part No.AU R1560055 01
BrandVerderflex
SGD788.29
Each
units
Peristaltic Electric 324ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 195-3557
Mfr. Part No.S1CBH07065PVTS070U111000EN
BrandProMinent
SGD5,443.85
Each
units
Diaphragm - 63L/h 7m 7 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF