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. 121-8601
Mfr. Part No.DF4A0W004004P0U120001210
BrandProMinent
£914.71
Each
Units
Peristaltic Electric 0.35L/h - 4 bar - - IP65 DF4a +20°C - 100 to 240 V 24 (Consumption)W -
RS Stock No. 705-9355
Mfr. Part No.R3521139A
£164.11
Each
Units
Diaphragm Electric 15.1L/min 41m 4.1 bar 1/2 in Hose Barb 1/2 in Hose Barb IP54 R352 +60°C PP 12 V 108W -
RS Stock No. 121-8594
Mfr. Part No.GMXa0424PVT20000U11130EN
BrandProMinent
£1,549.33
Each
Units
- Electric 24L/h - 4 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. 705-9349
Mfr. Part No.R3811142A
£150.98
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
£169.00
Each
Units
Diaphragm Electric 5ml/min - 200 mbar - - IP40 7604 +60°C PEEK 24 V dc 1.5W FFKM, PEEK
RS Stock No. 667-9104
Mfr. Part No.D3135H7011AR
£149.79
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. 121-8598
Mfr. Part No.DF2A0208P00A10W1
BrandProMinent
£275.49
Each
Units
Peristaltic Electric 0.8L/h - 1.5 bar - - IP65 DF2a +20°C - 230 V 5 (Consumption)W -
RS Stock No. 705-9387
Mfr. Part No.53041-2003-110
£534.68
Each
Units
Centrifugal Electric 35L/min 16m - 1 in BSP 1 in BSP IP54 - - Bronze 110 V 250W -
RS Stock No. 125-4041
Mfr. Part No.AU R1580240 05
BrandVerderflex
£387.71
Each
Units
Peristaltic Electric 2200ml/min - - - - - M1500 - ABS 24 V dc 30W -
RS Stock No. 121-8599
Mfr. Part No.DF2A0216P00A10W1
BrandProMinent
£332.29
Each
Units
Peristaltic Electric 1.6L/h - 1.5 bar - - IP65 DF2a +20°C - 230 V 5 (Consumption)W -
RS Stock No. 763-2480
Mfr. Part No.G70K202A
£287.20
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. 121-8589
Mfr. Part No.BT4B0413PVT2000U1110000
BrandProMinent
£861.95
Each
Units
- Electric 12.3L/h - 4 bar 3/4 in G 3/4 in G IP65 BT4B +20°C PVDF 100 to 230 V 15.2 (Consumption)W PVDF
RS Stock No. 121-8602
Mfr. Part No.DF4A0W004015P0U120001210
BrandProMinent
£996.00
Each
Units
Peristaltic Electric 1.5L/h - 4 bar - - IP65 DF4a +20°C - 100 to 240 V 24 (Consumption)W -
RS Stock No. 705-9359
Mfr. Part No.R3521339A
£175.83
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. 121-8591
Mfr. Part No.GMXa1602PVT20000U11130EN
BrandProMinent
£1,212.27
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. 121-8588
Mfr. Part No.BT4B0708PVT2000U1110000
BrandProMinent
£861.95
Each
Units
- Electric 7.1L/h - 7 bar 3/4 in G 3/4 in G IP65 BT4B +20°C PVDF 100 to 230 V 15.2 (Consumption)W PVDF
RS Stock No. 144-850
Mfr. Part No.BL 10/D
£169.13
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. 121-8597
Mfr. Part No.DLTA0730PVT2000U11131EN0
BrandProMinent
£1,987.54
Each
Units
- Electric 29.2L/h - 7 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. 125-4046
Mfr. Part No.AU M310240 12
BrandVerderflex
£559.06
Each
Units
Peristaltic Electric 3400ml/min - - - - - R3DC - Aluminium 24 V 100W -
RS Stock No. 144-838
Mfr. Part No.BL 20/D
£169.13
Each
Units
Diaphragm Electric 18.3L/h - 7.3 psi - - IP65 BL20/D - Glass Fibre Reinforced PP 220 V, 240 V 200W -