[IDINIEILIL]

I hear that SMC valves have to have a minimum amount of back pressure to stay closed. So, what would I have to do about the dump valves to keep from leaking?? just let them be..?

Ex.: I fill the bags to say.... 90 PSI and the compressor fills the tank back up to 160 PSI so that means the fill valve will be closed securely but that's 90 PSI being pushed on the dump valve and nothing to push back...

 

[bigdanmcintosh]

I've heard this also, but its never been proven to me...

I also think you are worrying about something that wont be a problem anyway..

 

[IDINIEILIL]

Are you sure? Cause this guy said he lifted the front all the way and was trying to hop the back and while he was doing that, the front would lower very slowly...

 

[bigdanmcintosh]

ya, mine does that also....

there cant be more pressure in the lines than there is in the tank...

for example, if the bags were at 150, and the tank went to 130, the tank and bag pressure would equalize...

Parkers I know dont do this, all the others, I'm not sure about..
My Norgreens do for sure...

 

[IDINIEILIL]

Well where is all the places to get them or what's the cheapest place?

 

[bigdanmcintosh]

PSI has great deals on Parkers...

 

[SIXONEFORLIFE]

How bout puttin a check valve on the inlet valve?

 

[bigdanmcintosh]

yes, you can do that on either side of the up valve...

 

[joebomber52]

or add tention to the springs in the valve

 

[chubsdaddycustoms]

Originally posted by IDINIEILIL@Jul 25 2003, 10:10 PM
I hear that SMC valves have to have a minimum amount of back pressure to stay closed. So, what would I have to do about the dump valves to keep from leaking?? just let them be..?

Ex.: I fill the bags to say.... 90 PSI and the compressor fills the tank back up to 160 PSI so that means the fill valve will be closed securely but that's 90 PSI being pushed on the dump valve and nothing to push back...

some elec vavles need check vavles at each supply line to the vavles then no lowering of the opposite side with hitting the switch