non - return valves 1

[luc4van]

Dear all,

Please define "tight shut off type" compared to a valve needed to seal off completely

Thank yoy and regards

luc4van

 

[MintJulep]

They're just words.

To properly characterize a valve's performance in regards to leakage you need to specify a media, a differential pressure and and permissible amount of leakage over a time.

 

[luc4van]

This is exactly my problem during the enquiry stage the only specification given was the flow rates and no differential pressure and with the statement "tight shut off type"

The flow rates given was "7,5 m/s in normal operating conditions and up to 10 m/s in unusual operating conditions"

The media is water

That is why I would like to have a definition explanation for the phrase "tight shut off type"

Thank you and regards

luc4van

 

[budt]

I believe this valve would be considered "tight Shut-off type."

http://www.kepner.com/inline_check_relief_valve.htm

Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING

 

[budt]

Here is another companies Zero Leak Check Valve

http://www.generant.com/check_valve.htm

Unique deisgnn to keep the "O" Ring from getting caught up in the fluid flow.

A Google search for "zero leak check valve+seal ring" brought oup several others as well.


Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING