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. 121-8589
Mfr. Part No.BT4B0413PVT2000U1110000
BrandProMinent
SGD1,752.50
Each
units
- Electric 12.3L/h - 4 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. 195-3559
Mfr. Part No.GXLAEU1612PVT20000U11130EN
BrandProMinent
SGD4,299.50
Each
units
- - 12L/h 16m 16 bar - - - GXLa - PVDF 230 V 78W PVDF
RS Stock No. 185-6117
Mfr. Part No.162.1143
BrandVerderflex
SGD547.35
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6125
Mfr. Part No.164.0128
BrandVerderflex
SGD282.50
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6138
Mfr. Part No.164.0012
BrandVerderflex
SGD282.50
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6156
Mfr. Part No.169.6022
BrandVerderflex
SGD139.53
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8601
Mfr. Part No.DF4A0W004004P0U120001210
BrandProMinent
SGD1,859.76
Each
units
Peristaltic Electric 0.35L/h - 4 bar - - IP65 DF4a +20°C - 100 to 240 V 24 (Consumption)W -
RS Stock No. 185-6130
Mfr. Part No.164.0147
BrandVerderflex
SGD268.31
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6129
Mfr. Part No.164.0146
BrandVerderflex
SGD282.50
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 125-4046
Mfr. Part No.AU M310240 12
BrandVerderflex
SGD1,136.67
Each
units
Peristaltic Electric 3400ml/min - - - - - R3DC - Aluminium 24 V 100W -
RS Stock No. 125-4039
Mfr. Part No.AU R1580125 09
BrandVerderflex
SGD672.98
Each
units
Peristaltic Electric 1200ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 185-6111
Mfr. Part No.162.1113
BrandVerderflex
SGD576.30
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-7496
Mfr. Part No.PNDB1601PVT2000001
BrandProMinent
SGD1,191.26
Each
units
- Air 1L/h - 16 bar - - - - - PVDF - - -
RS Stock No. 126-0254
Mfr. Part No.PA5120-F04
BrandSMC
SGD1,199.04
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8603
Mfr. Part No.DF4A0W003060P0U120001210
BrandProMinent
SGD1,948.18
Each
units
Peristaltic Electric 6L/h - 2.5 bar - - IP65 DF4a +20°C - 100 to 240 V 24 (Consumption)W -
RS Stock No. 185-6119
Mfr. Part No.162.1118
BrandVerderflex
SGD638.56
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6120
Mfr. Part No.163.0001
BrandVerderflex
SGD218.94
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-6669
Mfr. Part No.AU UV EZ
BrandVerderflex
SGD2,920.17
Each
units
Peristaltic Electric 0.937L/min 10m 1 bar - - IP40 UV-EZ +40°C Polyamide 100 → 120 V, 220 → 240 V 100VA -
RS Stock No. 125-4041
Mfr. Part No.AU R1580240 05
BrandVerderflex
SGD961.22
Each
units
Peristaltic Electric 2200ml/min - - - - - M1500 - ABS 24 V dc 30W -
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 - -