Just noticed my pressure regulator hissing/leaking air?
Using a DeVilbiss Pro 4000 compressor, with a pressure switch that causes the compressor to kick in whenever the pressure drops to roughly 95 psi ( and to cut off at about 130 psi). That pressurized air runs into a Numatics P21B04 pressure regulator.
Whenever I dial that regulator down to provide a lower pressure to my tool ... let's say, down to 60 PSI ... I hear a hiss of air (as the pressure drops). My spouse perceives this as a malfunction, and tells me that the regulator didn't used to hiss like that.
Something else about the operation of the regulator that doesn't seem right to me: I would think that adjusting the knob for lower downstream pressure would have immediate results ... that I would see the pressure indicator move as I adjust the control knob. This is not the case. Instead, turning the control know just seems to create an air leak that eventually stops when the contained pressure is sufficiently reduced.
Id we're dealing with a malfunction, we'll probably just replace the pressure regulator. But if this is how the unit is intended to function, I don't want to spend $$$ and end up in the same situation.
What do you think? Does this sound like a malfunction?