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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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Part Details Brand 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 Input Connection Size Output Connection Size Output Thread Standard or Connection Type Input Thread Standard or Connection Type
ProMinent Diaphragm Air Operated Positive Displacement Pump, 650L/h, 7 bar ProMinent Diaphragm Air 650L/h - 7 bar - - - - - PVDF - - - - - - -
ProMinent Air Operated Positive Displacement Pump, 16.7L/h, 2 bar ProMinent - Air 16.7L/h - 2 bar - - - - - PVDF - - - - - - -
ProMinent Air Operated Positive Displacement Pump, 6.3L/h, 7 bar ProMinent - Air 6.3L/h - 7 bar - - - - - PVDF - - - - - - -
ProMinent Positive Displacement Pump, 80L/h, 90 → 253 V ac ProMinent - - 80L/h - - - - IP67 DCCA - - 90 → 253 V ac - - - - - -
ProMinent Air Operated Positive Displacement Pump, 1L/h, 16 bar ProMinent - Air 1L/h - 16 bar - - - - - PVDF - - - - - - -
ProMinent Diaphragm Electric Operated Positive Displacement Pump, 120L/h, 4 bar, 100 → 230 V ac ProMinent Diaphragm Electric 120L/h - 4 bar - 1 in G - S1Cb +100 °C @ 15 min (2 bar) PVDF 100 → 230 V ac - PVDF - 25.4mm G -
ProMinent Diaphragm Electric Operated Positive Displacement Pump, 42L/h, 10 bar, 12 (SST) bar, 100 → 230 V ac ProMinent Diaphragm Electric 42L/h - 10 bar, 12 (SST) bar - - - S1Cb +100 °C @ 15 min (2 bar) PVDF 100 → 230 V ac - PVDF - 25.4mm G -
ProMinent Diaphragm Electric Operated Positive Displacement Pump, 65L/h, 7 bar, 100 → 230 V ac ProMinent Diaphragm Electric 65L/h - 7 bar - - - S1Cb +100 °C @ 15 min (2 bar) PVDF 100 → 230 V ac - PVDF - 25.4mm G -
Xylem Flojet Diaphragm Electric Operated Positive Displacement Pump, 3.8L/min, 2.4 bar, 24 V dc Xylem Flojet Diaphragm Electric 3.8L/min 25m 2.4 bar 3/8 in Hose Barb 3/8 in Hose Barb - RLF222 +43°C PP 24 V dc 30W - 3/8in 3/8in Hose Barb Hose Barb
Xylem Flojet Diaphragm Electric Operated Positive Displacement Pump, 3.8L/min, 2.5 bar, 12 V dc Xylem Flojet 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 3/8in 3/8in Hose Barb Hose Barb
Xylem Flojet Diaphragm Air Operated Positive Displacement Pump, 19L/min, 8.27 bar Xylem Flojet 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 1/2 in, 1/4 in 1/2 in, 1/4 in Hose Barb Hose Barb
RS PRO Diaphragm Electric Operated Positive Displacement Pump, 150ml/min, 1 bar, 1.5 → 4.5 V RS Pro Diaphragm Electric 150ml/min - 1 bar - - IP50 D200 +100°C Nylon 1.5 → 4.5 V 0.48W Nitrile, Nylon, Silicone 2.4mm 2.4mm - -
Xylem Flojet Diaphragm Electric Operated Positive Displacement Pump, 3.8L/min, 2.5 bar, 24 V dc Xylem Flojet Diaphragm Electric 3.8L/min 21m 2.5 bar 3/8 in Hose Barb 3/8 in Hose Barb - RLF222 +43°C PP 24 V dc 30W - 3/8in 3/8in Hose Barb Hose Barb
Hanna Instruments Diaphragm Electric Operated Positive Displacement Pump, 5L/h, 101.5 psi, 220 V, 240 V Hanna Instruments Diaphragm Electric 5L/h - 101.5 psi - - IP65 BL5/D - Glass Fibre Reinforced PP 220 V, 240 V 200W - 3/8in 3/8in - -
Xylem Flojet Diaphragm Air Operated Positive Displacement Pump, 19L/min, 6.9 bar Xylem Flojet 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 1/2 in, 1/4 in 1/2 in, 1/4 in Hose Barb Hose Barb
Verderflex Peristaltic Electric Operated Positive Displacement Pump, 0.24L/min, 1 bar, 12 V dc Verderflex Peristaltic Electric 0.24L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA - 4mm 6mm - -
W Robinson And Sons Drum Electric Operated Positive Displacement Pump, 40L/min, 12 V dc W Robinson And Sons Drum Electric 40L/min 12m - - 3/4 in Plain - - - - 12 V dc - - - 3/4in Plain -
Xylem Flojet Diaphragm Electric Operated Positive Displacement Pump, 7.6L/min, 4.1 bar, 24 V Xylem Flojet Diaphragm Electric 7.6L/min 41m 4.1 bar 3/4 in NPT 3/8 in NPT - R352 +60°C PP 24 V 144W - 3/4in 3/8in NPT NPT
Verderflex Peristaltic Electric Operated Positive Displacement Pump, 0.12L/min, 1 bar, 12 V dc Verderflex Peristaltic Electric 0.12L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA - 4mm 6mm - -
Verderflex Peristaltic Electric Operated Positive Displacement Pump, 0.562L/min, 1 bar, 12 V dc Verderflex Peristaltic Electric 0.562L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 20W - 9.6mm 9.6mm - -
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