Centrifugal and PD pumps with discharge valves closed
Centrifugal and PD pumps with discharge valves closed
(OP)
Dear Friends,
Good Morning to all,
Please explain what are all the problems that pump will encounter if the discharge valve is closed in the running condition for both centrifugal and PD pumps.
In case of centrifugal pump, what will be the effect on impeller, pump shaft. seals, pressure inside the casing,NPSH requirement, Power consumption, effects on motor and other issues.
Is it advisable to start the pump with discharge valve closed.
Good Morning to all,
Please explain what are all the problems that pump will encounter if the discharge valve is closed in the running condition for both centrifugal and PD pumps.
In case of centrifugal pump, what will be the effect on impeller, pump shaft. seals, pressure inside the casing,NPSH requirement, Power consumption, effects on motor and other issues.
Is it advisable to start the pump with discharge valve closed.





RE: Centrifugal and PD pumps with discharge valves closed
For the 3rd question, are you referring to centrifugal or PD pumps?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Centrifugal and PD pumps with discharge valves closed
Closing a discharge valve on any pump that is still running will cause problems and can break it so why do you want to do it?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Centrifugal and PD pumps with discharge valves closed
It took me less than 5 seconds to find this website.
RE: Centrifugal and PD pumps with discharge valves closed
Why do positive displacement pumps usually have relief valve?
Why do centrifugal pumps usually have mini-flow recirc?
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(2B)+(2B)' ?