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.

...
Lees meer Lees minder

Filters

1 - 20 van 144 producten worden weergegeven
Resultaten per pagina
Omschrijving Prijs 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-stocknr. 702-6894
FabrikantRS PRO
€ 56,33
Each
Aantal stuks
Diaphragm Electric 150ml/min - 1 bar - - IP50 D200 +100°C Nylon 1.5 → 4.5 V 0.48W Nitrile, Nylon, Silicone
RS-stocknr. 702-6898
FabrikantRS PRO
€ 74,61
Each
Aantal stuks
Diaphragm Electric 380ml/min - 11 psi - - IP50 D250 +100°C Aluminium 1.5 → 5 V 0.48W Anodized Aluminium, Nitrile, Silicone, Stainless Steel
RS-stocknr. 705-9330
FabrikantnummerRLFP222202D
FabrikantXylem Flojet
€ 113,39
Each
Aantal stuks
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 -
RS-stocknr. 705-9321
FabrikantnummerRLFP122202D
FabrikantXylem Flojet
€ 105,27
Each
Aantal stuks
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
RS-stocknr. 446-3483
Fabrikantnummer416989
FabrikantXylem Flojet
€ 345,67
Each
Aantal stuks
Diaphragm Electric 3L/min 89m 20 bar - - IP44 AD4/90 +77°C - 230 V 55W -
RS-stocknr. 705-9327
FabrikantnummerRLF222201D
FabrikantXylem Flojet
€ 111,51
Each
Aantal stuks
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 -
RS-stocknr. 705-6675
FabrikantnummerAU R2550060 RS1
FabrikantVerderflex
€ 189,99
Each
Aantal stuks
Peristaltic Electric 0.12L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6VA -
RS-stocknr. 667-9093
FabrikantnummerR4300143A
FabrikantXylem Flojet
€ 310,27
Each
Aantal stuks
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-stocknr. 667-9116
FabrikantnummerG575215A
FabrikantXylem Flojet
€ 178,07
Each
Aantal stuks
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-stocknr. 705-6684
FabrikantnummerAU R2550030 RS1
FabrikantVerderflex
€ 189,99
Each
Aantal stuks
Peristaltic Electric 0.06L/min 10m 1 bar - - - R2550 +40°C ABS, PC 12 V dc 6W -
RS-stocknr. 667-9100
FabrikantnummerD3131H5011AR
FabrikantXylem Flojet
€ 177,14
Each
Aantal stuks
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 - -
RS-stocknr. 705-9352
FabrikantnummerR3811242A
FabrikantXylem Flojet
€ 258,28
Each
Aantal stuks
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-stocknr. 705-9324
FabrikantnummerRLFP122201D
FabrikantXylem Flojet
€ 105,13
Each
Aantal stuks
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
RS-stocknr. 667-9107
FabrikantnummerCW474-024
FabrikantXylem
€ 395,09
Each
Aantal stuks
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-stocknr. 705-6659
FabrikantnummerAU ES3R16
FabrikantVerderflex
€ 134,52
Each
Aantal stuks
Peristaltic Electric - 20m 1 bar - - - ES3R1 +40°C Polyamide - 20W -
RS-stocknr. 705-6662
FabrikantnummerAU EZ3R16 100 02
FabrikantVerderflex
€ 323,01
Each
Aantal stuks
Peristaltic Electric 0.375L/min 20m 1 bar - - - EZ3R1 +40°C Polyamide 12 V dc 17W -
RS-stocknr. 121-8586
FabrikantnummerBT4B1601PVT2000U1110000
FabrikantProMinent
€ 1.120,98
Each
Aantal stuks
- Electric 1.1L/h - 16 bar 3/4 in G 3/4 in G IP65 BT4B +20°C PVDF 100 to 230 V 9.6 (Consumption)W PVDF
RS-stocknr. 667-9104
FabrikantnummerD3135H7011AR
FabrikantXylem Flojet
€ 295,67
Each
Aantal stuks
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-stocknr. 493-1920
Fabrikantnummer7043 RS
€ 233,95
Each
Aantal stuks
Drum Electric 40L/min 12m - - 3/4 in Plain - - - - 12 V dc - -
RS-stocknr. 705-9359
FabrikantnummerR3521339A
FabrikantXylem Flojet
€ 246,96
Each
Aantal stuks
Diaphragm Electric 7.6L/min 41m 4.1 bar 3/4 in NPT 3/8 in NPT - R352 +60°C PP 24 V 144W -
Related Products
The Hanna Instruments black stone BL-series dosing pump ...
Description:
The Hanna Instruments black stone BL-series dosing pump uses a minimum number of moving parts, therefore reducing the chance of mechanical failure. Its maximum flow rate is 5l/hour. The external flow control (the potentiometer) on the front of the pump ...
The R3DC peristaltic pump is a versatile and ...
Description:
The R3DC peristaltic pump is a versatile and highly capable solution for your fluid transfer and dosing needs. Their simplistic design ensures reliability and minimal maintenance costs with damaged tube or tube elements easy to change within seconds, minimising downtime ...
Verderflex Scientific Auto Control Pump with Easy Tube ...
Description:
Verderflex Scientific Auto Control Pump with Easy Tube Load Pump Head. Keypad control of pump speed and flow rateDigital display of pump speedreversableRobust enclosure with chemical resistant finishEasy Tube loading110 / 230 Vac 50 / 60 Hz supplyWill accept additional ...
Verderflex Scientific Manual Control Pump with Easy Tube ...
Description:
Verderflex Scientific Manual Control Pump with Easy Tube Load Pump Head. Simple control of pump speed and flow rateTwo digit potentiometer for speed controlRobust enclosure with chemical resistant finishEasy Tube Loading110 / 230 Vac 50 / 60 Hz supplyWill accept ...