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. 180-9203
Mfr. Part No.S1CBH07065PVTS070UA110S0EN
BrandProMinent
TWD108,380.00
Each
units
Diaphragm Electric 65L/h - 7 bar DN 10 1-3/4 in G IP55, IP65 S1Cb +100 °C @ 15 min (2 bar) PVDF 100 → 230 V ac - PVDF
RS Stock No. 185-6146
Mfr. Part No.164.0047
BrandVerderflex
TWD5,850.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 122-6644
Mfr. Part No.T240-ANB-D
BrandTecnomatic
TWD71,091.00
Each
units
Diaphragm Air 240L/min 8.5m - - - - T240 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls
RS Stock No. 146-6434
Mfr. Part No.R4300342A
TWD8,107.00
Each
units
Diaphragm Automatically Operated 3.7 g/min, 14 L/min - 3.1 bar 1/2 in Hose Barb 1/2 in Hose Barb - QUAD 4000 +54°C PP 24 V dc - Elastomer, Polypropylene (Housing)
RS Stock No. 185-6150
Mfr. Part No.169.6014
BrandVerderflex
TWD3,031.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8598
Mfr. Part No.DF2A0208P00A10W1
BrandProMinent
TWD12,212.00
Each
units
Peristaltic Electric 0.8L/h - 1.5 bar - - IP65 DF2a +20°C - 230 V 5 (Consumption)W -
RS Stock No. 122-6642
Mfr. Part No.TEP130-ANB-D
BrandTecnomatic
TWD38,953.00
Each
units
Diaphragm Air 130L/min 8.5m - 1 in Plain 1 in Plain - TEP130 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls
RS Stock No. 180-9205
Mfr. Part No.DCCAW006PR0010EN
BrandProMinent
TWD22,249.00
Each
units
- - 80L/h - - - - IP67 DCCA - - 90 → 253 V ac - -
RS Stock No. 121-8597
Mfr. Part No.DLTA0730PVT2000U11131EN0
BrandProMinent
TWD87,781.00
Each
units
- Electric 29.2L/h - 7 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. 185-6109
Mfr. Part No.162.1098
BrandVerderflex
TWD11,890.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-9321
Mfr. Part No.RLFP122202D
TWD3,348.00
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 EPDM, PP, Santoprene, Stainless Steel, Viton
RS Stock No. 125-4037
Mfr. Part No.AU R1580055 01
BrandVerderflex
TWD17,186.00
Each
units
Peristaltic Electric 518ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 705-9355
Mfr. Part No.R3521139A
TWD7,274.00
Each
units
Diaphragm Electric 15.1L/min 41m 4.1 bar 1/2 in Hose Barb 1/2 in Hose Barb IP54 R352 +60°C PP 12 V 108W -
RS Stock No. 125-4049
Mfr. Part No.148.1021
BrandVerderflex
TWD82,652.00
Each
units
Peristaltic Electric 1310ml/min - - 8 mm Tube - - Vantage 3000 - - 85 → 265 V ac - -
RS Stock No. 185-6140
Mfr. Part No.164.0014
BrandVerderflex
TWD5,828.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8593
Mfr. Part No.GMXa0414PVT20000U11130EN
BrandProMinent
TWD54,169.00
Each
units
- Electric 14L/h - 4 bar 3/4 in G 3/4 in G IP65 GMXa +20°C PVDF 100 to 230 V 24 / 30 (Consumption)W PVDF
RS Stock No. 185-6119
Mfr. Part No.162.1118
BrandVerderflex
TWD13,921.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6129
Mfr. Part No.164.0146
BrandVerderflex
TWD5,828.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 705-6687
Mfr. Part No.AU R2550015 RS1
BrandVerderflex
TWD7,403.00
Each
units
Peristaltic Electric 0.03L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 667-9182
Mfr. Part No.TEP130-PX
BrandTecnomatic
TWD36,165.00
Each
units
Diaphragm Air 132L/min 80m - 1 in Push Fit 1 in Push Fit - TEP132 - PP - - -