4 replies to this topic

[ayche]

Wherever centrifugal pump is in application we can throttle flow, as in we can change the flowrate, but I have always seen gate valves at the discharge end of centrifugal pumps.

Why do we use gate valves at the discharge end as they are not good for throttling or controlling the flow, the disk of the gate valve gets eroded and  the valve vibrates. 

Why globe valves are not used?

 

 

Regards

Ayche

[breizh]

Ayche ,

Your statement is strange to me  :"I have always seen gate valves at the discharge end of centrifugal pumps ".

 

Please refer to the document attached to support your work.

 

Breizh

[samayaraj]

Ayche,

 

Centrifugal pumps are designed to deliver a rated flow for a given system resistance. If you want to vary the flow rate, on the downstream of isolation valve (Gate valve), take a branch and put a globe/ control valve to take a part of liquid back to reservoir. Like this you can control the flow. Hence, at the centrifugal pump discharge, there will be an isolation valve and not the regulation valve.

 

 

#Samayaraj

Edited by samayaraj, 18 December 2014 - 06:28 AM.

[fallah]

ayche,

 

The gate valve at the discharge end of centrifugal pumps are there only for isolation purpose. If it's intended to control the flow rate produced by such pumps, flow control valve should be applied along the discharge line to do the job...

[kiansafaie]

Dear Mr.Falah:

It should be mentioned that a globe valve is used as isolation of suction and dishcharge because of less leakage of this type.   And as you mentioned, gate valve should not be used for flow control.
Thank you