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. 702-6894
BrandRS PRO
MYR257.68
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. 702-6898
BrandRS PRO
MYR334.13
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. 144-866
Mfr. Part No.BL 15/D
MYR888.10
Each
units
Diaphragm Electric 15.2L/h - 14.5 psi - - IP65 BL15/D - Glass Fibre Reinforced PP 220 V, 240 V 200W -
RS Stock No. 144-850
Mfr. Part No.BL 10/D
MYR888.10
Each
units
Diaphragm Electric 10.8L/h - 43.5 psi - - IP65 BL10/D - Glass Fibre Reinforced PP 220 V, 240 V 200W -
RS Stock No. 705-6656
Mfr. Part No.AU EZ3R16
BrandVerderflex
MYR560.40
Each
units
Peristaltic Electric - 20m 1 bar - - - EZ3R1 +40°C Polyamide - 20W -
RS Stock No. 667-9113
Mfr. Part No.G573215A
MYR1,360.42
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. 705-6665
Mfr. Part No.AU EZ3R16 060 02
BrandVerderflex
MYR1,619.56
Each
units
Peristaltic Electric 0.225L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -
RS Stock No. 705-6653
Mfr. Part No.AU EZ3R16 150 02
BrandVerderflex
MYR1,448.19
Each
units
Peristaltic Electric 0.562L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 20W -
RS Stock No. 125-4046
Mfr. Part No.AU M310240 12
BrandVerderflex
MYR3,350.36
Each
units
Peristaltic Electric 3400ml/min - - - - - R3DC - Aluminium 24 V 100W -
RS Stock No. 667-9116
Mfr. Part No.G575215A
MYR1,051.92
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. 705-9333
Mfr. Part No.R3711132A
MYR780.53
Each
units
Diaphragm Electric 5.5L/min 69m 6.9 bar 3/8 in BSP 3/8 in BSP - R371 +60°C Glass Fibre Reinforced Nylon 12 V dc 108W -
RS Stock No. 705-9349
Mfr. Part No.R3811142A
MYR804.20
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. 619-4432
Mfr. Part No.156993
BrandBurkert
MYR941.89
Each
units
Diaphragm Electric 5ml/min - 200 mbar - - IP40 7604 +60°C PEEK 24 V dc 1.5W FFKM, PEEK
RS Stock No. 121-8601
Mfr. Part No.DF4A0W004004P0U120001210
BrandProMinent
MYR5,760.55
Each
units
Peristaltic Electric 0.35L/h - 4 bar - - IP65 DF4a +20°C - 100 to 240 V 24 (Consumption)W -
RS Stock No. 705-6687
Mfr. Part No.AU R2550015 RS1
BrandVerderflex
MYR910.94
Each
units
Peristaltic Electric 0.03L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 705-6671
Mfr. Part No.AU R2550120 RS1
BrandVerderflex
MYR1,014.98
Each
units
Peristaltic Electric 0.24L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS Stock No. 125-4037
Mfr. Part No.AU R1580055 01
BrandVerderflex
MYR2,323.47
Each
units
Peristaltic Electric 518ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 667-9182
Mfr. Part No.TEP130-PX
BrandTecnomatic
MYR4,022.09
Each
units
Diaphragm Air 132L/min 80m - 1 in Push Fit 1 in Push Fit - TEP132 - PP - - -
RS Stock No. 122-6648
Mfr. Part No.TEP50-ANB-D
BrandTecnomatic
MYR4,046.08
Each
units
Diaphragm Air 50L/min 8m - - - - TEP50 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls
RS Stock No. 667-9100
Mfr. Part No.D3131H5011AR
MYR902.99
Each
units
Diaphragm Electric 5.3L/min 30m 4.2 bar 3/8 in NPT 3/8 in NPT IP44 D3131 +54°C Glass Filled PP 12 V dc - -
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