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Selasa, 15 Maret 2011

Air, have you come across this before?

/ On : 06.16/ Thank you for visiting my small blog here. If you wanted to discuss or have the question around this article, please contact me e-mail at mozabani@yahoo.com
Air,

A couple of years ago I compiled and edited
a long list of 'Cardinal Sins' of hydraulics,
which were sent to me by our members.

Sylvain Roy from Red Deer in Canada,
sent in this classic, must-not-do:

>Using a piloted-operated check valve
as a motion control valve, or
a counterbalance valve as a load-holding valve.

Yup, they're different 'tools' for different jobs.

And when the rule is broken, this is the typical result:

"We installed a pilot-operated check valve
for load-holding purposes. Extension of the cylinder
is smooth and load holding also good. But when retracting
the cylinder (during pilot-line opening of the check valve)
there is a huge shake in the system."

This is not an uncommon mistake.

So I recorded a 3-minute video which explains
WHY pilot-operated check valves shudder
when used in this situation.

Watch it here:

http://www.hydraulicsupermarket.com/po-check-shudder


Yours for better hydraulics knowledge,

Brendan Casey

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