On Wed, 7 Mar 2012 02:40:18 -0500, "Tom Gardner"
wrote:

I have a flow control valve like this:
http://www.grainger.com/Grainger/PAR...789?Pid=search
It controls the speed of a 2x10 cylinder and the movement of the cylinder
and mechanism is making the adjustment knob move so the cylinder gets faster
and faster. It does have a set screw that will lock the adjustment knob but
the operator needs to change it often and during the stroke. Is there a
simple way to stiffen the knob without locking it? (Yes, I could get a new
one.)
Tom,
Description claims there is a setscrew to lock the knob in position..
... Simply replace the set screw with a "friction" setscrew - one
which has a spring and a brass/nylon plug in the end of it to apply
tension. After it has been adjusted for the proper "tension" - only a
slight change once in a while should be needed due to wear of the
nylon/brass insert.
Ken Sterling