Positive displacement pumps are placed into one of three main classes: rotary positive displacement and reciprocating positive displacement.
The pump technology selected for an application is subject on different reasons: the fluid viscosity, kind of liquid being pumped, how abrasive it is, temperature and the required duty point.
This post is going to provide a summary of what reciprocating positive displacement pumps and rotary pumps are, also called PD. It is also going to dive into the reasons they are important, when a specific design or kind is most suitable for an application, and lastly, eight reasons to select this type of pump for your application(s).
What Are Positive Displacement Pumps?
These types of pumps are manufactured to guarantee that any pumping operation is forward (positive). Its inner design guarantees and hinders fluid from re-circulating backtracking towards the pump inlet, or inside its casing.
These pumps can be of reciprocating or rotary positive displacement design. With various inner parts, and designs to adapt to differing fluid attributes.
Particular principles are general across reciprocating and rotary pumps because of their design.
These Designs Have the Following Attributes:
- A set amount of fluid transferred per revolution
- Pressure stays unchanging
- Flow is correlated with speed
How Do These Kinds of Pumps Work?
There are upwards of ten kinds of these kinds of pumps. For explaining their operation in basic form, these pumps operate by fluid being pulled into a cavity, or chamber by creating a vacuum.
After the chamber is filled, the pump then cycles, causing the fluid currently inside the pump head to strengthen in pressure. This causes it to be then discharged through the discharge port into the pipe-work.
Kinds of Positive Displacement Pumps?
There are 2 classifications of PD pumps: they are rotary and reciprocating, they could be driven by hydraulics, electronic, or by engine, and manufactured in just about any material to allow use across various sectors and applications.
Rotary Positive Displacement Pumps
Rotary positive displacement pumps, functions by a rotary action creating flow and pressure.
Reciprocating Positive Displacement Pumps
Unlike rotary positive displacement pumps. These pumps operate by transforming attached motors rotary forces into a reciprocating motion.
The Advantages and Disadvantages of Positive Displacement Pumps
Below are the Advantages and Disadvantages of these kinds of Pumps
The Advantages
These kinds of pump designs have different advantages for applications. The following are the most general:
- Precise Predictable Flow
- Wide Viscosity Management
- Continual Pressure
- Lower Depreciation
- Preserving Liquid Attributes
- Slip-Resistant Designs
The Disadvantages
There are certainly disadvantages to these kinds of pumps. The following are the most general:
- Restricted Flow
- Challenging to Maintain
- Maintenance Schedule
- Oscillating Flow
- Cost Effectiveness with Lower Viscosity Fluids
- Not the most budget friendly solution
- Necessary accessories for System or Operator Safety
Eight Reasons to use a Positive Displacement Pump
The following are eight reasons why this kind of pump may be most suitable for your application:
- Viscosity is greater than 300cst
- A set volume of flow is necessary across a wide range of pressures
- Viscosity differs
- Back pressure could change
- Metering
- A Low Flow rate is necessary
- High pressured discharge
- Shear responsive liquids
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