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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