Industrial vacuum pumps are pieces of equipment that remove gases from an enclosed space for the intention of creating a vacuum. They are available in different types and are used for a broad range of industries such as pharmaceutical, food and beverage processing, oil and gas, power generation, and more. The most popular type widely used today is the rotary pump. Its popularity and versatility are mainly attributed to its relatively compact design, capability to deal with high differential pressure, high-viscosity performance, and continuous flow despite differential pressure.
In terms of operating principle, a rotary pump is a kind of positive-displacement pump that displaces a known quantity of liquid with every revolution of its pumping elements which include gears, lobes, vanes, rotary pistons, and screws. Rotary pump filters fluid in a closed casing and discharges a smooth flow later on. It can deal with almost any type of liquid that does not have abrasive solids. It is quite simple in design and very efficient in handling flows that are viewed to be low for the economic application of centrifuges. In pumping highly viscous liquids, rotary pumps should be used at reduced speeds in order to facilitate its flow into the casing quickly enough.
Lastly, unlike a centrifugal pump, a rotary pump offers a capacity that is not affected much by pressure variations on both the suction and discharge ends. Also, these pumps are valuably self-priming, making them more advantageous to use than other pumps. Being a positive-displacement pump, a fixed volume of liquid is moved despite the resistance against which the rotary pump is pumping.
Unfortunately, any blockage in the system can hasten the damage to the pump or the entire system. Hence, the operator must always make sure that the system is well aligned so that a complete flow path is achieved for smooth fluid flow. Also, due to their positive displacement feature, rotary pumps will need a relief valve to protect the entire piping system.
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