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.

...
Read more Read less

Filters

Viewing 41 - 60 of 139 products
Results per page
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
SGD1,023.69
Each
units
- Automatically Operated 200L/min - 0.7 MPa - - - PA3000 +60°C - - - ADC12 (Aluminium)
RS Stock No. 195-3556
Mfr. Part No.S1CBH12035PVTS070U111000EN
BrandProMinent
SGD5,106.22
Each
units
Diaphragm - 42L/h 10m 10 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF
RS Stock No. 185-6153
Mfr. Part No.169.6017
BrandVerderflex
SGD134.82
Each
units
- - - - - - - - - - - - - -
RS Stock No. 196-1157
Mfr. Part No.PB1013A-F01
BrandSMC
SGD346.03
Each
units
- Air 40L/min 2.5m 0.7 MPa - - - PB1000A +50°C - - - Polypropylene, Stainless Steel
RS Stock No. 185-6131
Mfr. Part No.164.0148
BrandVerderflex
SGD259.26
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6145
Mfr. Part No.164.0032
BrandVerderflex
SGD259.26
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6158
Mfr. Part No.169.6023
BrandVerderflex
SGD146.90
Each
units
- - - - - - - - - - - - - -
RS Stock No. 179-7499
Mfr. Part No.1010797
BrandProMinent
SGD1,845.87
Each
units
Diaphragm Air 650L/h - 7 bar - - - - - PVDF - - -
RS Stock No. 185-6110
Mfr. Part No.162.1103
BrandVerderflex
SGD576.30
Each
units
- - - - - - - - - - - - - -
RS Stock No. 125-4036
Mfr. Part No.AU R1560055 01
BrandVerderflex
SGD758.95
Each
units
Peristaltic Electric 324ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 705-6662
Mfr. Part No.AU EZ3R16 100 02
BrandVerderflex
SGD536.72
Each
units
Peristaltic Electric 0.375L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -
RS Stock No. 121-8596
Mfr. Part No.DLTA1020PVT2000U11131EN0
BrandProMinent
SGD4,041.39
Each
units
- Electric 19.1L/h - 10 bar 3/4 in G 3/4 in G IP65 DLTa +20°C PVDF 100 to 230 V 78 (Consumption)W PVDF
RS Stock No. 185-6154
Mfr. Part No.169.6020
BrandVerderflex
SGD134.82
Each
units
- - - - - - - - - - - - - -
RS Stock No. 126-0251
Mfr. Part No.PA3120-F03
BrandSMC
SGD850.36
Each
units
- - - - - - - - - - - - - -
RS Stock No. 195-3562
Mfr. Part No.DFXAEU0730SPTU0000U11130EN
BrandProMinent
SGD4,085.95
Each
units
Peristaltic - 30L/h 6m 7 bar - - - DFXA - PVDF 100 → 230 V 45W TPV
RS Stock No. 185-6136
Mfr. Part No.164.0166
BrandVerderflex
SGD282.50
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 196-1155
Mfr. Part No.PA3110-F03
BrandSMC
SGD1,212.90
Each
units
- Automatically Operated 200L/min - 0.7 MPa - - - PA3000 +60°C - - - ADC12 (Aluminium)
RS Stock No. 185-6130
Mfr. Part No.164.0147
BrandVerderflex
SGD259.26
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 126-0254
Mfr. Part No.PA5120-F04
BrandSMC
SGD1,158.60
Each
units
- - - - - - - - - - - - - -
RS Stock No. 180-9204
Mfr. Part No.S1CBH04120PVTS070UA110S0EN
BrandProMinent
SGD5,265.23
Each
units
Diaphragm Electric 120L/h - 4 bar DN 15 1 in G IP55, IP65 S1Cb +100 °C @ 15 min (2 bar) PVDF 100 → 230 V ac - PVDF
Related Products
The Lowara Ecocirc Bronze Vario High Efficiency circulator ...
Description:
The Lowara Ecocirc Bronze Vario High Efficiency circulator is suitable for hot water recirculation and boiler feeding in residential applications. Energy saving permanent magnet EC (electronically commutated) type variable speed motor with spherical rotor/statorWet rotor with a single spherical ceramic/carbon ...
The M1500 peristaltic pump is a versatile and ...
Description:
The M1500 peristaltic pump is a versatile and highly capable solution for your fluid transfer and dosing needs. Their simplistic design ensures reliability and minimal maintenance costs with damaged tube or tube elements easy to change within seconds, minimising downtime ...
The M60 is a compact panel mounted peristaltic ...
Description:
The M60 is a compact panel mounted peristaltic pump. It uses a snap-on tube cartridge to eliminate tools, simplifying and speeding up tube changeovers. Easy to integrate in equipment, it has many uses including analyser feeds, chemical dosing systems, condensate ...
Air pilot type process pumpDischarge rate 1 to ...
Description:
Air pilot type process pumpDischarge rate 1 to 20ℓ /minCompact, large capacityEasy maintenance due to structural design that allows the diaphragm andcheck valve to be replaced individually2 to 5 time longer life than that of conventional pumps.