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 1 - 20 of 83 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. 702-6894
BrandRS PRO
TWD1,891.00
Each
units
Diaphragm Electric 150ml/min - 1 bar - - IP50 D200 +100°C Nylon 1.5 → 4.5 V 0.48W Nitrile, Nylon, Silicone
RS Stock No. 619-4432
Mfr. Part No.156993
BrandBurkert
TWD6,377.00
Each
units
Diaphragm Electric 5ml/min - 200 mbar - - IP40 7604 +60°C PEEK 24 V dc 1.5W FFKM, PEEK
RS Stock No. 667-9116
Mfr. Part No.G575215A
TWD7,070.00
Each
units
Diaphragm Air 19L/min - 8.27 bar 1/2 in Hose Barb, 1/4 in Hose Barb 1/2 in Hose Barb, 1/4 in Hose Barb - G5752 - PP - - Hastelloy C, Kalrez, PP, Santoprene, Viton
RS Stock No. 705-6653
Mfr. Part No.AU EZ3R16 150 02
BrandVerderflex
TWD11,321.00
Each
units
Peristaltic Electric 0.562L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 20W -
RS Stock No. 705-6684
Mfr. Part No.AU R2550030 RS1
BrandVerderflex
TWD6,676.00
Each
units
Peristaltic Electric 0.06L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6W -
RS Stock No. 702-6898
BrandRS PRO
TWD2,117.00
Each
units
Diaphragm Electric 380ml/min - 11 psi - - IP50 D250 +100°C Aluminium 1.5 → 5 V 0.48W Anodized Aluminium, Nitrile, Silicone, Stainless Steel
RS Stock No. 705-9324
Mfr. Part No.RLFP122201D
TWD3,633.00
Each
units
Diaphragm Electric 3.8L/min 21m 2.5 bar 3/8 in Hose Barb 3/8 in Hose Barb - RLF122 +43°C PP 12 V dc 30W EPDM, PP, Santoprene, Stainless Steel, Viton
RS Stock No. 125-4044
Mfr. Part No.AU M310125 02
BrandVerderflex
TWD22,781.00
Each
units
Peristaltic Electric 1800ml/min - - - - - R3DC - Aluminium 24 V 100W -
RS Stock No. 705-6671
Mfr. Part No.AU R2550120 RS1
BrandVerderflex
TWD6,676.00
Each
units
Peristaltic Electric 0.24L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 705-9349
Mfr. Part No.R3811142A
TWD6,330.00
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 12 V 108W -
RS Stock No. 705-6659
Mfr. Part No.AU ES3R16
BrandVerderflex
TWD4,052.00
Each
units
Peristaltic Electric - 20m 1 bar - - - ES3R1 +40°C Polyamide - 20W -
RS Stock No. 705-6662
Mfr. Part No.AU EZ3R16 100 02
BrandVerderflex
TWD11,321.00
Each
units
Peristaltic Electric 0.375L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -
RS Stock No. 705-6656
Mfr. Part No.AU EZ3R16
BrandVerderflex
TWD4,052.00
Each
units
Peristaltic Electric - 20m 1 bar - - - EZ3R1 +40°C Polyamide - 20W -
RS Stock No. 125-4046
Mfr. Part No.AU M310240 12
BrandVerderflex
TWD22,781.00
Each
units
Peristaltic Electric 3400ml/min - - - - - R3DC - Aluminium 24 V 100W -
RS Stock No. 705-6665
Mfr. Part No.AU EZ3R16 060 02
BrandVerderflex
TWD11,321.00
Each
units
Peristaltic Electric 0.225L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -
RS Stock No. 667-9104
Mfr. Part No.D3135H7011AR
TWD6,340.00
Each
units
Diaphragm Electric 8.1L/min 30m 7.1 bar 3/8 in NPT 3/8 in NPT IP44 D3135 - Glass Fibre Reinforced PP 12 V - -
RS Stock No. 705-9343
Mfr. Part No.R3811342A
TWD6,410.00
Each
units
Diaphragm Electric 5.3L/min 105m 10.5 bar 3/8 in NPT 3/8 in NPT - R381 +60°C Glass Fibre Reinforced Nylon 24 V 108W -
RS Stock No. 667-9113
Mfr. Part No.G573215A
TWD10,511.00
Each
units
Diaphragm Air 19L/min - 6.9 bar 1/2 in Hose Barb, 1/4 in Hose Barb 1/2 in Hose Barb, 1/4 in Hose Barb - G5732 +48.9°C PP - - Hastelloy C, Kalrez, PP, Santoprene, Viton
RS Stock No. 667-9093
Mfr. Part No.R4300143A
TWD7,529.00
Each
units
Diaphragm Electric 19L/min - 3.1 bar 3/4 in Hose Barb 3/4 in Hose Barb IP44 R4300 - PP 12 V dc - Buna, Elastomer, PP
RS Stock No. 146-6434
Mfr. Part No.R4300342A
TWD7,642.00
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)