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: reciprocating positive displacement pumps and rotary pumps.

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. 763-2471
Mfr. Part No.G57C202A
TWD11,485.00
Each
units
Diaphragm Air 19L/min - 100 psi 1/4 in Hose Barb 3/8 in Hose Barb - G57C +49°C PP - - Hasteloy C, PP, Santoprene, Viton
RS Stock No. 185-6136
Mfr. Part No.164.0166
BrandVerderflex
TWD5,828.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6146
Mfr. Part No.164.0047
BrandVerderflex
TWD5,850.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 667-9107
Mfr. Part No.CW474-024
BrandXylem
TWD11,102.00
Each
units
Diaphragm Electric 13L/min - 3 bar 1/2 in Hose Barb 1/2 in Hose Barb IP55 CW474 - Glass Fibre Reinforced PP 230 V ac 120W -
RS Stock No. 185-6150
Mfr. Part No.169.6014
BrandVerderflex
TWD3,031.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6131
Mfr. Part No.164.0148
BrandVerderflex
TWD5,850.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 705-9352
Mfr. Part No.R3811242A
TWD9,362.00
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 230 V - -
RS Stock No. 125-4049
Mfr. Part No.148.1021
BrandVerderflex
TWD82,652.00
Each
units
Peristaltic Electric 1310ml/min - - 8 mm Tube - - Vantage 3000 - - 85 → 265 V ac - -
RS Stock No. 121-8603
Mfr. Part No.DF4A0W003060P0U120001210
BrandProMinent
TWD42,319.00
Each
units
Peristaltic Electric 6L/h - 2.5 bar - - IP65 DF4a +20°C - 100 to 240 V 24 (Consumption)W -
RS Stock No. 185-6148
Mfr. Part No.164.0001
BrandVerderflex
TWD5,850.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 195-3562
Mfr. Part No.DFXAEU0730SPTU0000U11130EN
BrandProMinent
TWD93,692.00
Each
units
Peristaltic - 30L/h 6m 7 bar - - - DFXA - PVDF 100 → 230 V 45W TPV
RS Stock No. 185-6127
Mfr. Part No.164.0130
BrandVerderflex
TWD5,828.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8588
Mfr. Part No.BT4B0708PVT2000U1110000
BrandProMinent
TWD38,207.00
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. 195-3560
Mfr. Part No.GXLAEU1020PVT20000U11130EN
BrandProMinent
TWD93,396.00
Each
units
- - 20L/h 10m 10 bar - - - GXLa - PVDF 230 V 78W PVDF
RS Stock No. 185-6125
Mfr. Part No.164.0128
BrandVerderflex
TWD5,828.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 667-9097
Mfr. Part No.R4300242A
TWD10,229.00
Each
units
Diaphragm Electric 12L/min 40m 2.1 bar 1/2 in Hose Barb 1/2 in Hose Barb IP44 R4300 +54°C Glass Fibre Reinforced PP 230 V ac - -
RS Stock No. 195-3558
Mfr. Part No.S1CBH04120PVTS070U111000EN
BrandProMinent
TWD123,314.00
Each
units
Diaphragm - 117L/h 4m 4 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF
RS Stock No. 126-0254
Mfr. Part No.PA5120-F04
BrandSMC
TWD26,141.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6145
Mfr. Part No.164.0032
BrandVerderflex
TWD5,850.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6116
Mfr. Part No.162.1138
BrandVerderflex
TWD11,890.00
Each
units
- - - - - - - - - - - - - -