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:
A. 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. 146-6434
Mfr. Part No.R4300342A
HK$2,060.93
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. 185-6135
Mfr. Part No.164.0126
BrandVerderflex
HK$1,487.13
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6109
Mfr. Part No.162.1098
BrandVerderflex
HK$3,033.69
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6143
Mfr. Part No.164.0030
BrandVerderflex
HK$1,487.13
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6146
Mfr. Part No.164.0047
BrandVerderflex
HK$1,487.13
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6131
Mfr. Part No.164.0148
BrandVerderflex
HK$1,487.13
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 125-4038
Mfr. Part No.AU R1560125 01
BrandVerderflex
HK$4,369.10
Each
units
Peristaltic Electric 800ml/min - - - - - M1500 - ABS 24 V dc 30W -
New
RS Stock No. 196-1156
Mfr. Part No.PA3120-03
BrandSMC
HK$5,844.12
Each
units
- Automatically Operated 200L/min - 0.7 MPa - - - PA3000 +60°C - - - ADC12 (Aluminium)
RS Stock No. 185-6140
Mfr. Part No.164.0014
BrandVerderflex
HK$1,487.13
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6114
Mfr. Part No.162.1128
BrandVerderflex
HK$3,033.69
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 195-3556
Mfr. Part No.S1CBH12035PVTS070U111000EN
BrandProMinent
HK$29,150.72
Each
units
Diaphragm - 42L/h 10m 10 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF
RS Stock No. 705-9359
Mfr. Part No.R3521339A
HK$1,972.03
Each
units
Diaphragm Electric 7.6L/min 41m 4.1 bar 3/4 in NPT 3/8 in NPT - R352 +60°C PP 24 V 144W -
RS Stock No. 667-9113
Mfr. Part No.G573215A
HK$2,702.47
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6108
Mfr. Part No.162.1093
BrandVerderflex
HK$3,033.69
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6139
Mfr. Part No.164.0013
BrandVerderflex
HK$1,487.13
Each
units
- - - - - - - - - - - - - -
RS Stock No. 125-4041
Mfr. Part No.AU R1580240 05
BrandVerderflex
HK$4,369.10
Each
units
- - - - - - - - - - - - - -
RS Stock No. 125-4037
Mfr. Part No.AU R1580055 01
BrandVerderflex
HK$4,369.10
Each
units
Peristaltic Electric 518ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 180-9205
Mfr. Part No.DCCAW006PR0010EN
BrandProMinent
HK$6,053.10
Each
units
- - 80L/h - - - - IP67 DCCA - - 90 → 253 V ac - -
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