Pumps and Valves
Pumps and Valves
(OP)
Hello;
How should be pump, non return valve, and manual valve combination? Is there any line up type to get more efficiency?
Normally after pump; non return valve then manual valve could be line up. That is inevitable?
How should be pump, non return valve, and manual valve combination? Is there any line up type to get more efficiency?
Normally after pump; non return valve then manual valve could be line up. That is inevitable?





RE: Pumps and Valves
Two things:
#1 This has been asked before, why don't you try the "SEARCH" option before you post a question?
#2 What are you trying to do, reinvent the wheel?
Here is some advice:
- Centrifugal Pumps: First comes the discharge of the pump, then comes the Check (Non-return) Valve then comes the Block (Isolation or Shut-off) Valve
- Positive Displacement Pumps: First comes the discharge of the pump, then comes the Block (Isolation or Shut-off) Valve. A Check (Non-return) Valve is not required for PD Pumps because of the nature of the PD Pump.
Sometimes its possible to do all the right things and still get bad results
RE: Pumps and Valves
See http://www.eng-tips.com/viewthread.cfm?qid=410093 for all the points raised.
Also depends on your type of PD pump. Some come with integral NRVs ( diaphragm, piston, some don't ( screw, gear etc)
What do you mean by "efficiency"?? Efficiency of what? - space, pipe size, pressure drop?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pumps and Valves
RE: Pumps and Valves
Check valve and isolation valve is reversed as using with it. So pump, check valve and isolation valve lines up you said so...
Why is that??
Thanks
RE: Pumps and Valves
RE: Pumps and Valves
Normally centrifugal pumps are using check valve and isolation valve line up...
For Positive displacement pump this line reverse for check and isolation valve as writing above... Why is it doing that?
Thanks
RE: Pumps and Valves
Of course each to his own preference.
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.)