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. 121-8590
Mfr. Part No.BT4B0220PVT2000U1110000
BrandProMinent
SGD1,770.82
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. 179-7499
Mfr. Part No.1010797
BrandProMinent
SGD1,930.27
Each
units
Diaphragm Air 650L/h - 7 bar - - - - - PVDF - - -
RS Stock No. 185-6145
Mfr. Part No.164.0032
BrandVerderflex
SGD271.12
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 195-3558
Mfr. Part No.S1CBH04120PVTS070U111000EN
BrandProMinent
SGD5,715.32
Each
units
Diaphragm - 117L/h 4m 4 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF
RS Stock No. 185-6131
Mfr. Part No.164.0148
BrandVerderflex
SGD271.12
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6146
Mfr. Part No.164.0047
BrandVerderflex
SGD271.12
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6110
Mfr. Part No.162.1103
BrandVerderflex
SGD553.07
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-7496
Mfr. Part No.PNDB1601PVT2000001
BrandProMinent
SGD1,206.54
Each
units
- Air 1L/h - 16 bar - - - - - PVDF - - -
RS Stock No. 196-1156
Mfr. Part No.PA3120-03
BrandSMC
SGD1,070.50
Each
units
- Automatically Operated 200L/min - 0.7 MPa - - - PA3000 +60°C - - - ADC12 (Aluminium)
RS Stock No. 185-6155
Mfr. Part No.169.6021
BrandVerderflex
SGD140.99
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6143
Mfr. Part No.164.0030
BrandVerderflex
SGD282.50
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 195-3556
Mfr. Part No.S1CBH12035PVTS070U111000EN
BrandProMinent
SGD5,446.46
Each
units
Diaphragm - 42L/h 10m 10 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF
RS Stock No. 180-9205
Mfr. Part No.DCCAW006PR0010EN
BrandProMinent
SGD980.92
Each
units
- - 80L/h - - - - IP67 DCCA - - 90 → 253 V ac - -
RS Stock No. 185-6114
Mfr. Part No.162.1128
BrandVerderflex
SGD553.07
Each
units
- - - - - - - - - - - - - -
RS Stock No. 125-4039
Mfr. Part No.AU R1580125 09
BrandVerderflex
SGD680.02
Each
units
Peristaltic Electric 1200ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 121-8603
Mfr. Part No.DF4A0W003060P0U120001210
BrandProMinent
SGD1,968.55
Each
units
Peristaltic Electric 6L/h - 2.5 bar - - IP65 DF4a +20°C - 100 to 240 V 24 (Consumption)W -
RS Stock No. 179-7497
Mfr. Part No.PNDB0708PVT2000001
BrandProMinent
SGD1,082.41
Each
units
- Air 6.3L/h - 7 bar - - - - - PVDF - - -
RS Stock No. 121-8600
Mfr. Part No.DF2A0224P00A10W1
BrandProMinent
SGD682.66
Each
units
Peristaltic Electric 2.4L/h - 1.5 bar - - IP65 DF2a +20°C - 230 V 5 (Consumption)W -
RS Stock No. 195-3563
Mfr. Part No.DFXAEU0530SPTU0000U11130EN
BrandProMinent
SGD4,358.22
Each
units
Peristaltic - 30L/h 5m 5 bar - - - DFXA - PVDF 100 → 230 V 45W TPV
RS Stock No. 125-4046
Mfr. Part No.AU M310240 12
BrandVerderflex
SGD1,148.55
Each
units
Peristaltic Electric 3400ml/min - - - - - R3DC - Aluminium 24 V 100W -