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.

...
Read more Read less

Filters

Viewing 21 - 40 of 138 products
Results per page
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. 121-8586
Mfr. Part No.BT4B1601PVT2000U1110000
BrandProMinent
HK$9,314.41
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8602
Mfr. Part No.DF4A0W004015P0U120001210
BrandProMinent
HK$11,223.84
Each
units
Peristaltic Electric 1.5L/h - 4 bar - - IP65 DF4a +20°C - 100 to 240 V 24 (Consumption)W -
RS Stock No. 144-850
Mfr. Part No.BL 10/D
HK$1,944.03
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8600
Mfr. Part No.DF2A0224P00A10W1
BrandProMinent
HK$3,744.50
Each
units
Peristaltic Electric 2.4L/h - 1.5 bar - - IP65 DF2a +20°C - 230 V 5 (Consumption)W -
RS Stock No. 122-6644
Mfr. Part No.T240-ANB-D
BrandTecnomatic
HK$18,073.18
Each
units
Diaphragm Air 240L/min 8.5m - - - - T240 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls
RS Stock No. 705-6653
Mfr. Part No.AU EZ3R16 150 02
BrandVerderflex
HK$3,064.09
Each
units
- - - - - - - - - - - - - -
RS Stock No. 122-6642
Mfr. Part No.TEP130-ANB-D
BrandTecnomatic
HK$9,902.80
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-6684
Mfr. Part No.AU R2550030 RS1
BrandVerderflex
HK$1,882.09
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-9343
Mfr. Part No.R3811342A
HK$1,720.92
Each
units
- - - - - - - - - - - - - -
RS Stock No. 144-866
Mfr. Part No.BL 15/D
HK$1,944.03
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8599
Mfr. Part No.DF2A0216P00A10W1
BrandProMinent
HK$3,744.50
Each
units
Peristaltic Electric 1.6L/h - 1.5 bar - - IP65 DF2a +20°C - 230 V 5 (Consumption)W -
RS Stock No. 144-838
Mfr. Part No.BL 20/D
HK$1,944.05
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-6662
Mfr. Part No.AU EZ3R16 100 02
BrandVerderflex
HK$3,064.09
Each
units
- - - - - - - - - - - - - -
RS Stock No. 705-9330
Mfr. Part No.RLFP222202D
HK$910.01
Each
units
- - - - - - - - - - - - - -
RS Stock No. 667-9116
Mfr. Part No.G575215A
HK$1,813.93
Each
units
- - - - - - - - - - - - - -
RS Stock No. 763-2480
Mfr. Part No.G70K202A
HK$3,221.16
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8590
Mfr. Part No.BT4B0220PVT2000U1110000
BrandProMinent
HK$9,713.26
Each
units
- - - - - - - - - - - - - -
RS Stock No. 667-9093
Mfr. Part No.R4300143A
HK$1,995.14
Each
units
- - - - - - - - - - - - - -
RS Stock No. 121-8595
Mfr. Part No.DLTA1612PVT2000U11131EN0
BrandProMinent
HK$22,426.54
Each
units
- Electric 11.3L/h - 16 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. 179-7499
Mfr. Part No.1010797
BrandProMinent
HK$10,587.86
Each
units
Diaphragm Air 650L/h - 7 bar - - - - - PVDF - - -
Related Products
Introducing the RS PRO Powder Free Disposable Nitrile ...
Description:
Introducing the RS PRO Powder Free Disposable Nitrile Gloves. These high-quality disposable gloves offer strength, durability and barrier protection that prevents skin contact to ensure contamination does not occur. They have been designed for maximum sensitivity, dexterity and comfort, and ...
The Touch 'N' Tuff disposable nitrile gloves have ...
Description:
The Touch 'N' Tuff disposable nitrile gloves have set a new standard in comfort durability and quality for thin nitrile gloves. The nitrile compound offers a high level of resistance to nuisance nicks, cuts and abrasions and offers superior splash ...
100% nitrile compound material3 x puncture resistance of ...
Description:
100% nitrile compound material3 x puncture resistance of latex or PVC disposableLighter and coolerPowder FreeTextured fingertips for improved gripRolled cuff.
Advanced nitrile technology coupled with unique shape provides ...
Description:
Advanced nitrile technology coupled with unique shape provides a disposable glove that is exceptionally soft and pliable to wear. Electronics, Assembly, Inspection, Laboratory, Medical, PharmaceuticalEN455 Medical Devices Class 1No latex proteins - eliminates protein skin sensitisationAmbidextrous, fits either ...