Quote:
Originally Posted by Clifford
We've been testing our pneumatics system and we've noticed that our relief valve isn't, well, relieving. We've pushed 120 to test it (140 once) but it isn't bleeding any air out of the system. We've tried two different valves (we've got two) in both A & B outlets. Nothing seems to be working, which is bad, because we'd really like to pass inspection.
Any input?
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We noticed the same thing. During our 1st pneumatics test the relief failed to relieve itself and we shut the system down and purged it when it headed north of 140. Subsequent tests consistently did the same thing.
Robot Rules <R91> states the factory relief value is 125 psi.
Pneumatics manual page 3 states it is 120 psi.
From the factory the relief was well higher than 140.
So we were left with no choice but to lower the relief value to the correct value. Either the relief isn't calibrated correctly at the factory or the gauge isn't correct.
We set the relief to 120 according to the KOP gauges and the pressure switch didn't open until a little north of 120.
In light of all we have observed the relief needs to be set at 125 psi in my opinion just like the datasheet indicates.
But in the name of safety I think everyone needs to make sure that their relief isn't faulty. This is something inspection needs to look for.
Anyone have a NIST calibrated gauge ?