So I picked up this little LPR with a few other items last week. As usual with used items I usually test, tear down, rebuild & retest.
Well this simple little bitch is giving me a heck of a time. I hook it up to my bench test set-up... HPR @ 350psi screwed into an ASA
that has a gauge port, then screw the LPR into the gauge port hole.... attach a gauge to the LPR nipple via Cocker lp line. I back the
knob all the way off and then gas up the HPR. I'm figuring I'm probably gunna get a creeper.... but when the line pressures up nothing.
It's holding zero, so I let it set for a couple minutes and its still holding. I'm thinking this isn't gunna need much so I start turning the knob
to dial in some pressure.... the needle starts going up like normal and I stop it at 100psi and let it sit for a minute. Everything looks good
so I cut the air to the HPR and bleed off the air at the lp gauge hose. So now the system is zero'd out. So I put the lp line back on and proceed
to gas up the system again, figuring it should go to the previous setting of 100psi because I have not moved the LPR knob. So I watch the needle
approach 100psi..... and I watch it pass 100.... 105....110...and it's not slowing down so I have to back off on the tank. So I go through the process
of zeroing out the system and try again, same result. So I zero the system out again AND back the LPR knob all the way back off. I gas up the system
and the the HPR gasses up but the LPR is holding at zero like it should, so I start cranking the knob down and set it to 100psi again.... all is good.
That is until I zero out the system again and re-gas it.... it just blows past the previous setting of 100psi and keeps going.
I have tried 4 different o-rings on the plunger, different duro as well. I have tried different lubes and different springs. NONE of those changes has any
effect. The end result is always the same...... it woks only if you start with the system under pressure & the LPR zero'd out, then dial the pressure setting
to where you want it. I have never had an LPR do this.... any ideas?
Well this simple little bitch is giving me a heck of a time. I hook it up to my bench test set-up... HPR @ 350psi screwed into an ASA
that has a gauge port, then screw the LPR into the gauge port hole.... attach a gauge to the LPR nipple via Cocker lp line. I back the
knob all the way off and then gas up the HPR. I'm figuring I'm probably gunna get a creeper.... but when the line pressures up nothing.
It's holding zero, so I let it set for a couple minutes and its still holding. I'm thinking this isn't gunna need much so I start turning the knob
to dial in some pressure.... the needle starts going up like normal and I stop it at 100psi and let it sit for a minute. Everything looks good
so I cut the air to the HPR and bleed off the air at the lp gauge hose. So now the system is zero'd out. So I put the lp line back on and proceed
to gas up the system again, figuring it should go to the previous setting of 100psi because I have not moved the LPR knob. So I watch the needle
approach 100psi..... and I watch it pass 100.... 105....110...and it's not slowing down so I have to back off on the tank. So I go through the process
of zeroing out the system and try again, same result. So I zero the system out again AND back the LPR knob all the way back off. I gas up the system
and the the HPR gasses up but the LPR is holding at zero like it should, so I start cranking the knob down and set it to 100psi again.... all is good.
That is until I zero out the system again and re-gas it.... it just blows past the previous setting of 100psi and keeps going.
I have tried 4 different o-rings on the plunger, different duro as well. I have tried different lubes and different springs. NONE of those changes has any
effect. The end result is always the same...... it woks only if you start with the system under pressure & the LPR zero'd out, then dial the pressure setting
to where you want it. I have never had an LPR do this.... any ideas?
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