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 Hazardous Area Certification
RS Stock No. 702-6894
BrandRS PRO
kr 571,84
Each
Units
Diaphragm Electric 250-300ml/min - 1 bar - - IP50 D200 +100°C Nylon 1.5 → 4.5 V 0.48W -
RS Stock No. 702-6898
BrandRS PRO
kr 753,71
Each
Units
Diaphragm Electric 380ml/min - 11 psi - - IP50 D250 +100°C Aluminium 1.5 → 5 V 0.48W -
RS Stock No. 667-9093
Mfr. Part No.R4300143A
kr 3 595,32
Each
Units
Diaphragm Electric 19L/min - 3.1 bar 3/4 in Hose Barb 3/4 in Hose Barb IP44 R4300 - PP 12 V dc - -
RS Stock No. 705-6671
Mfr. Part No.AU R2550120 RS1
BrandVerderflex
kr 2 350,30
Each
Units
Peristaltic Electric 0.24L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 705-6675
Mfr. Part No.AU R2550060 RS1
BrandVerderflex
kr 2 350,30
Each
Units
Peristaltic Electric 0.12L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 705-9393
Mfr. Part No.53081-2003-230
kr 11 594,52
Each
Units
Centrifugal Electric 80L/min 20m - 1-1/2 in BSP 1-1/2 in BSP IP55 - - Bronze 230 V ac 550W -
RS Stock No. 705-6665
Mfr. Part No.AU EZ3R16 060 02
BrandVerderflex
kr 4 020,42
Each
Units
Peristaltic Electric 0.225L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -
RS Stock No. 705-6653
Mfr. Part No.AU EZ3R16 150 02
BrandVerderflex
kr 3 980,70
Each
Units
Peristaltic Electric 0.562L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 20W -
RS Stock No. 493-1920
Mfr. Part No.7043 RS
kr 2 709,46
Each
Units
Drum Electric 40L/min 12m - - 3/4 in Plain - - - - 12 V dc - -
RS Stock No. 705-6687
Mfr. Part No.AU R2550015 RS1
BrandVerderflex
kr 2 350,30
Each
Units
Peristaltic Electric 0.03L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 705-6684
Mfr. Part No.AU R2550030 RS1
BrandVerderflex
kr 2 350,30
Each
Units
Peristaltic Electric 0.06L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6W -
RS Stock No. 705-9321
Mfr. Part No.RLFP122202D
kr 1 200,13
Each
Units
Diaphragm Electric 3.8L/min 21m 2.5 bar 3/8 in Hose Barb 3/8 in Hose Barb - RLF122 +43°C PP 12 V dc 30W -
RS Stock No. 121-8586
Mfr. Part No.BT4B1601PVT2000U1110000
BrandProMinent
kr 13 246,41
Each
Units
Diaphragm Electric 1.1L/h 6m 16 bar 3/4 in G 3/4 in G IP65 BT4B +20°C PVDF 100 → 230 V 9.6 (Consumption)W -
RS Stock No. 705-6659
Mfr. Part No.AU ES3R16
BrandVerderflex
kr 1 561,31
Each
Units
Peristaltic Electric - 20m 1 bar - - - ES3R1 +40°C Polyamide - 20W -
RS Stock No. 705-6662
Mfr. Part No.AU EZ3R16 100 02
BrandVerderflex
kr 4 020,42
Each
Units
Peristaltic Electric 0.375L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -
RS Stock No. 446-3483
Mfr. Part No.416989
kr 4 005,45
Each
Units
Diaphragm Electric 3L/min 89m 20 bar - - IP44 AD4/90 +77°C - 230 V 55W -
RS Stock No. 705-6656
Mfr. Part No.AU EZ3R16
BrandVerderflex
kr 1 341,01
Each
Units
Peristaltic Electric 1.26L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12/24 V dc 20W -
RS Stock No. 667-9116
Mfr. Part No.G575215A
kr 2 104,89
Each
Units
Diaphragm Air 19L/min - 8.27 bar 1/2 in Hose Barb, 1/4 in Hose Barb 1/2 in Hose Barb, 1/4 in Hose Barb - G5752 - PP - - -
RS Stock No. 125-4041
Mfr. Part No.AU R1580240 05
BrandVerderflex
kr 6 907,54
Each
Units
Peristaltic Electric 2200ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 705-9324
Mfr. Part No.RLFP122201D
kr 1 322,66
Each
Units
Diaphragm Electric 3.8L/min 21m 2.5 bar 3/8 in Hose Barb 3/8 in Hose Barb - RLF122 +43°C PP 12 V dc 30W -