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. 185-6135
Mfr. Part No.164.0126
BrandVerderflex
TWD5,850.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 667-9093
Mfr. Part No.R4300143A
TWD7,885.00
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. 144-838
Mfr. Part No.BL 20/D
TWD7,647.00
Each
units
Diaphragm Electric 18.3L/h - 7.3 psi - - IP65 BL20/D - Glass Fibre Reinforced PP 220 V, 240 V 200W -
RS Stock No. 185-6130
Mfr. Part No.164.0147
BrandVerderflex
TWD5,828.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 667-9182
Mfr. Part No.TEP130-PX
BrandTecnomatic
TWD36,165.00
Each
units
Diaphragm Air 132L/min 80m - 1 in Push Fit 1 in Push Fit - TEP132 - PP - - -
RS Stock No. 185-6128
Mfr. Part No.164.0131
BrandVerderflex
TWD5,828.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 126-0251
Mfr. Part No.PA3120-F03
BrandSMC
TWD19,186.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 195-3557
Mfr. Part No.S1CBH07065PVTS070U111000EN
BrandProMinent
TWD118,254.00
Each
units
Diaphragm - 63L/h 7m 7 bar - - IP65 S1cb - PVDF 100 → 230 V 220W PVDF
RS Stock No. 144-844
Mfr. Part No.BL 5/D
TWD7,449.00
Each
units
Diaphragm Electric 5L/h - 101.5 psi - - IP65 BL5/D - Glass Fibre Reinforced PP 220 V, 240 V 200W -
RS Stock No. 196-1155
Mfr. Part No.PA3110-F03
BrandSMC
TWD27,366.00
Each
units
- Automatically Operated 200L/min - 0.7 MPa - - - PA3000 +60°C - - - ADC12 (Aluminium)
RS Stock No. 185-6149
Mfr. Part No.164.0049
BrandVerderflex
TWD5,828.00
Each
units
- - 375ml/min 86mm 1 bar - - - - - Nylon, Polycarbonate 24 V dc - -
RS Stock No. 185-6111
Mfr. Part No.162.1113
BrandVerderflex
TWD11,890.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 195-3563
Mfr. Part No.DFXAEU0530SPTU0000U11130EN
BrandProMinent
TWD94,033.00
Each
units
Peristaltic - 30L/h 5m 5 bar - - - DFXA - PVDF 100 → 230 V 45W TPV
RS Stock No. 185-6126
Mfr. Part No.164.0129
BrandVerderflex
TWD5,828.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 185-6155
Mfr. Part No.169.6021
BrandVerderflex
TWD3,031.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 126-0253
Mfr. Part No.PA3210-F03
BrandSMC
TWD32,492.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8590
Mfr. Part No.BT4B0220PVT2000U1110000
BrandProMinent
TWD38,069.00
Each
units
- Electric 19L/h - 2 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. 185-6156
Mfr. Part No.169.6022
BrandVerderflex
TWD3,031.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 180-9202
Mfr. Part No.S1CBH12035PVTS070UA110S0EN
BrandProMinent
TWD117,703.00
Each
units
Diaphragm Electric 42L/h - 10 bar, 12 (SST) bar DN 10 1-3/4 in G IP55, IP65 S1Cb +100 °C @ 15 min (2 bar) PVDF 100 → 230 V ac - PVDF
RS Stock No. 705-6669
Mfr. Part No.AU UV EZ
BrandVerderflex
TWD63,664.00
Each
units
Peristaltic Electric 0.937L/min 10m 1 bar - - IP40 UV-EZ +40°C Polyamide 100 → 120 V, 220 → 240 V 100VA -