Centrifugal,
reciprocating, and rotary positive displacement pumps are the three
primary families into which pumps are divided. The choice of pump technology
for a given application is influenced by several factors, including the needed
duty point, temperature, abrasiveness, viscosity, and kind of liquid.
An introduction to
rotary pumps and reciprocating positive displacement pumps, or PD pumps, will
be given in this blog.
What Are
Positive Displacement Pumps? Pump with Positive Displacement
Pumps with positive
displacement (PD) are made to guarantee that all pumping motion is
forward-moving (positive). Its internal construction guarantees that fluid
cannot circulate inside its casing or back toward the pump inlet.
Positive
displacement (PD) pumps come in both rotary and reciprocating designs. with
various internal components and designs to handle a range of fluid properties.
Because of the way
they are made, reciprocating and rotary pumps share several design concepts.
The following
qualities apply to these designs:
- A constant amount of fluid moved each revolution.
- Pressure doesn't change.
- Speed and flow are proportionate.
Positive
displacement pumps: How Do They Operate?
More than ten
distinct varieties of positive displacement pumps exist. In the simplest terms
possible, PD pumps work by drawing fluid into a cavity or chamber by producing
a vacuum.
The fluid inside
the pump head experiences a rise in pressure when the chamber is filled and the
pump cycles. As a result, it is released into the pipes through the discharge
port.
Applications of
Positive Displacement Pumps
Because of their
adaptability and variety in design, these designs are utilized in a wide range
of applications.
Typical uses for
them include the following:
Unloading and
loading tankers Fuel Transfer Filling
Mostly fuels, but also chemicals, food ingredients, oils, and other liquids with viscosities ranging from sludges to thicker than water.
Tankers can be
stripped (fully emptied) with the use of positive displacement pumps, and
dry-run designs prevent pump damage. They are excellent at priming and make a
guarantee that, unlike centrifugal designs, siphoning doesn't happen when the
pump is stopped.
Dosing,
Metering, and Sampling
Any pump used must
deliver a certain volume per revolution to ensure precise, repetitive fluid
delivery into a process. This eliminates centrifugal systems in which the fluid
flow may fluctuate or recirculate inside the pump head.
The fluids utilized in these processes can vary depending on the application, however, they can include chemicals, flavourings, fuel, dyes, paint, flocculants, and coagulants in wastewater treatment. Because of its accuracy, PD Pumps are known to enable dosage accuracy of greater than 99%.
Knowing When to
Use a Positive Displacement Pump for Your Needs
Are you having
trouble deciding if a positive displacement pump is the right choice for your
application?
Since there are so many different kinds, designs, uses, and liquids, it is always best to contact Risansi. It is one of the leading positive displacement pump companies in India. Contact the knowledgeable engineers by phone, email, or live chat.
Within minutes after discussing your method, application, and intended result, we can frequently recommend a pump type.
Ask for a callback.
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