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.
Description:
The Verderflex peristaltic, electric operated, self-priming, positive displacement
pump has a maximum flow rate of 2200ml/minute. It is a versatile and highly capable solution for your fluid transfer and dosing needs. The simplistic design ensures reliability and minimal maintenance costs. ...
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 ...
Description:
Flojet developed the Quad pumps to deliver higher
flows up to 5 GPM (18.9 LPM) using a four-piston design with excellent self-priming capability. Built-in pressure switch automatically starts and stops pump when discharge valve opens and closes.Compact design and plug-in ...
Description:
The Xylem Flojet compact air-operated double diaphragm positive
displacement pump is suitable for water and light water-based chemicals. Its maximum flow rate is 21L/min. It is capable of air or CO2 drive pressures up to 100PSI (6.9bar). It has Santoprene ...