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. 121-8594
Mfr. Part No.GMXa0424PVT20000U11130EN
BrandProMinent
SGD3,182.99
Each
units
- Electric 24L/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. 185-6144
Mfr. Part No.164.0031
BrandVerderflex
SGD271.12
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 125-4037
Mfr. Part No.AU R1580055 01
BrandVerderflex
SGD796.53
Each
units
Peristaltic Electric 518ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 126-0254
Mfr. Part No.PA5120-F04
BrandSMC
SGD1,211.58
Each
units
- - - - - - - - - - - - - -
RS Stock No. 195-3557
Mfr. Part No.S1CBH07065PVTS070U111000EN
BrandProMinent
SGD5,500.76
Each
units
Diaphragm - 63L/h 7m 7 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF
RS Stock No. 185-6151
Mfr. Part No.169.6015
BrandVerderflex
SGD146.90
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6109
Mfr. Part No.162.1098
BrandVerderflex
SGD553.07
Each
units
- - - - - - - - - - - - - -
RS Stock No. 763-2480
Mfr. Part No.G70K202A
SGD590.03
Each
units
Diaphragm Air 18.9L/min - 100 psi 6 mm Hose 9.5 mm to 15 mm Hose - G70K +49°C PP - - -
RS Stock No. 705-6687
Mfr. Part No.AU R2550015 RS1
BrandVerderflex
SGD343.12
Each
units
Peristaltic Electric 0.03L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 185-6112
Mfr. Part No.162.1123
BrandVerderflex
SGD604.05
Each
units
- - - - - - - - - - - - - -
RS Stock No. 126-0253
Mfr. Part No.PA3210-F03
BrandSMC
SGD1,505.93
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6117
Mfr. Part No.162.1143
BrandVerderflex
SGD553.07
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-6671
Mfr. Part No.AU R2550120 RS1
BrandVerderflex
SGD342.39
Each
units
Peristaltic Electric 0.24L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 125-4038
Mfr. Part No.AU R1560125 01
BrandVerderflex
SGD796.53
Each
units
Peristaltic Electric 800ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 185-6153
Mfr. Part No.169.6017
BrandVerderflex
SGD140.99
Each
units
- - - - - - - - - - - - - -
RS Stock No. 195-3560
Mfr. Part No.GXLAEU1020PVT20000U11130EN
BrandProMinent
SGD4,344.45
Each
units
- - 20L/h 10m 10 bar - - - GXLa - PVDF 230 V 78W PVDF
RS Stock No. 125-4045
Mfr. Part No.AU M380240 15
BrandVerderflex
SGD1,148.55
Each
units
Peristaltic Electric 3.4L/min - - - - - R3DC - Aluminium 24 V dc 100 -
RS Stock No. 185-6152
Mfr. Part No.169.6016
BrandVerderflex
SGD146.90
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6127
Mfr. Part No.164.0130
BrandVerderflex
SGD282.50
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-6662
Mfr. Part No.AU EZ3R16 100 02
BrandVerderflex
SGD561.26
Each
units
Peristaltic Electric 0.375L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -