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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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庫存編號 667-9194
製造零件編號TEP50PTWD
BrandTecnomatic
HK$7,603.51
單位
Diaphragm Air 53L/min 70m - 1/2 in G 1/2 in G - TE53-PTW - PP - - -
RS庫存編號 667-9182
製造零件編號TEP130-PX
BrandTecnomatic
HK$8,880.00
單位
Diaphragm Air 132L/min 80m - 1 in Push Fit 1 in Push Fit - TEP132 - PP - - -
RS庫存編號 122-6644
製造零件編號T240-ANB-D
BrandTecnomatic
HK$16,038.00
單位
Diaphragm Air 240L/min 8.5m - - - - T240 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls
RS庫存編號 122-6642
製造零件編號TEP130-ANB-D
BrandTecnomatic
HK$9,467.71
單位
Diaphragm Air 130L/min 8.5m - 1 in Plain 1 in Plain - TEP130 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls
RS庫存編號 122-6648
製造零件編號TEP50-ANB-D
BrandTecnomatic
HK$7,373.19
單位
Diaphragm Air 50L/min 8m - - - - TEP50 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls
RS庫存編號 122-6646
製造零件編號T530-ANB-D
BrandTecnomatic
HK$34,891.11
單位
Diaphragm Air 530L/min 8.5m - - 2 in Plain - T530 - Aluminium - - Aluminium Body, NBR Diaphragms, NBR Valve Balls