Wednesday, November 25, 2015

What Is A Positive Displacement Sanitary Pump And How Does It Work?

By Marci Nielsen


PD pumps move fluids at a constant rate. They are the best choice for thick fluids. The flow of such is quiet slow because the resistance is high. However, the positive displacement pumps can handle them better compared to dynamic types. Read on to know more about what is a positive displacement sanitary pump.

PD pumps are less common compared to dynamic drives. This is because they cannot provide high flow rate which is crucial in the industrial setting. However, when the situation requires a slow flow rate then these are the best to use.

If the fluid is flowing at a high pressure, the conditions in the system are variable or the fluid is viscous, they are recommended. They are not affected immensely by changing pressures in the system like their counterparts. The liquids are moved consistently and gently. Liquids which are shear-sensitive require such conditions in their movement. Thus, you should make such a choice when moving them.

The amount displaced is the same in all motions. Pressure is generated through contraction and expansion of spaces in-between the elements facilitating the pumping. This results to an almost constant rate. If the speed is varied, the rate will also be affected. The mobile parts either move in rotary manner or reciprocating. With rotation, the fluid is drawn and expelled. The rotor count and type distinguishes the pumps in this category.

Reciprocating propels employ linear motion to move the liquefied product. A diaphragm or piston is used to draw it in and push it out. Check valves regulate the system flow. It is also responsible for directing the flow. Pump type and performance ought to be considered when making the choices. The efficiency, power, pressure and flow rate should come first. Otherwise, the drive will frustrate you.

The difference is in the designs and the functioning of the moving parts. The reciprocating parts are rugged. They are also able to generate high pressure. For the messy fluids, experts in the field recommend this propel type. They are further classified into those which use plungers and those which make use of diaphragms.

The diaphragm pumps are reciprocating. The fluids moved include the corrosives and those which have solid particles. They are not expensive to maintain and the chances of them leaking are almost zero. They also have no seals. For this reason, you can safely use them to move abrasive fluids and even slurries. Even though they run dry, they cannot be damaged.

Plunger and piston drives use a reciprocating piston or plunger in moving the fluids. The pistons and plungers and also the chambers are cylindrical in shape. They can generate high pump pressure and function in varying speed. Their lifespan is considerable and their efficiency rate is above ninety percent. They can handle abrasive liquids comfortably and even fluids flowing at high pressure.




About the Author:



No comments:

Post a Comment