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. 196-1156
Mfr. Part No.PA3120-03
BrandSMC
HK$6,227.87
Each
units
- Automatically Operated 200L/min - 0.7 MPa - - - PA3000 +60°C - - - ADC12 (Aluminium)
RS Stock No. 185-6131
Mfr. Part No.164.0148
BrandVerderflex
HK$1,577.30
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6111
Mfr. Part No.162.1113
BrandVerderflex
HK$3,217.62
Each
units
- - - - - - - - - - - - - -
RS Stock No. 125-4039
Mfr. Part No.AU R1580125 09
BrandVerderflex
HK$4,076.37
Each
units
Peristaltic Electric 1200ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 125-4037
Mfr. Part No.AU R1580055 01
BrandVerderflex
HK$4,633.99
Each
units
Peristaltic Electric 518ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 763-2480
Mfr. Part No.G70K202A
HK$3,432.67
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. 195-3556
Mfr. Part No.S1CBH12035PVTS070U111000EN
BrandProMinent
HK$31,686.12
Each
units
Diaphragm - 42L/h 10m 10 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF
RS Stock No. 125-4045
Mfr. Part No.AU M380240 15
BrandVerderflex
HK$6,681.99
Each
units
Peristaltic Electric 3.4L/min - - - - - R3DC - Aluminium 24 V dc 100 -
RS Stock No. 179-7499
Mfr. Part No.1010797
BrandProMinent
HK$11,229.79
Each
units
Diaphragm Air 650L/h - 7 bar - - - - - PVDF - - -
RS Stock No. 185-6128
Mfr. Part No.164.0131
BrandVerderflex
HK$1,577.30
Each
units
- - - - - - - - - - - - - -
RS Stock No. 195-3559
Mfr. Part No.GXLAEU1612PVT20000U11130EN
BrandProMinent
HK$25,274.90
Each
units
- - 12L/h 16m 16 bar - - - GXLa - PVDF 230 V 78W PVDF
RS Stock No. 185-6147
Mfr. Part No.164.0048
BrandVerderflex
HK$1,577.30
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 122-6648
Mfr. Part No.TEP50-ANB-D
BrandTecnomatic
HK$7,964.19
Each
units
Diaphragm Air 50L/min 8m - - - - TEP50 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls
RS Stock No. 121-8591
Mfr. Part No.GMXa1602PVT20000U11130EN
BrandProMinent
HK$14,489.23
Each
units
- Electric 2.3L/h - 16 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. 185-6109
Mfr. Part No.162.1098
BrandVerderflex
HK$3,217.62
Each
units
- - - - - - - - - - - - - -
RS Stock No. 125-4036
Mfr. Part No.AU R1560055 01
BrandVerderflex
HK$4,633.99
Each
units
Peristaltic Electric 324ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 185-6125
Mfr. Part No.164.0128
BrandVerderflex
HK$1,577.30
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-9352
Mfr. Part No.R3811242A
HK$2,524.31
Each
units
Diaphragm Electric 5.5L/min 105m 10.5 bar 3/8 in NPT 3/8 in NPT - R381 +60°C Glass Fibre Reinforced Nylon 230 V - -
RS Stock No. 185-6144
Mfr. Part No.164.0031
BrandVerderflex
HK$1,577.30
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 180-9203
Mfr. Part No.S1CBH07065PVTS070UA110S0EN
BrandProMinent
HK$29,474.34
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