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19 Oct 2021 Blog

Different Types of Centrifugal Pump

Centrifugal Pumps are perhaps the most common type of pump in operation today. With many different configurations available, centrifugal pumps are widely-used because of their design simplicity, high efficiency, wide range of capacity and head, smooth flow rate and ease of operation and maintenance.

 

There are four main type classifications of centrifugal pump, with the chief distinction of each being the mechanism that drives the reciprocating diaphragm.

Mechanically Actuated

This type of pump has a reciprocating mechanical linkage that is directly attached to the diaphragm. The pump includes a gear set or other mechanical mechanism to convert the rotation of the motor into a reciprocating motion of the linkage that is attached to the diaphragm. Flow may be varied by varying the stroke length or pump speed.

Hydraulically Actuated

This type of operation employs an intermediate hydraulic fluid located on the non-product side of the diaphragm to flex the diaphragm. The hydraulic fluid is pressurized by a reciprocating plunger. Though it acts similar to a mechanically actuated diaphragm, the plunger isn’t attached to the diaphragm, but rather pressurizes the intermediate hydraulic fluid, which flexes the diaphragm. Flow is varied with this type of diaphragm pump by varying pump speed or by varying the amount of hydraulic fluid that is bypassed.

Solenoid

These pumps have an electric motor that alternately energizes and de-energizes a solenoid, creating an electro-magnetic force that reacts with a metal part on the diaphragm. This causes the diaphragm to flex. Flow is varied by varying the pump speed.

Air Operated Double Diaphragm Pumps (AODD)

This is a type of double acting pump. They have two diaphragms and two sets of check valves. The pump is driven by compressed air operating alternately on the non-product side of one diaphragm, and then the other. The air is delivered to the alternate sides of the diaphragm by means of a shuttle valve. Flow is varied by varying air pressure supplied to the pump.