747ken said:
R12rules said:
None of my hoses have their valve core depressors inside the ends! They are removed imediately!
Hi R12,
I'm a HVAC student and found your post interesting. Hope you don't mind a few questions...
Why do you remove the core depressors? Is that for improved flow and reduced time to recover, evacuate, etc?
I'm trying to understand the blow back device. Is it the same thing as a check-valve on the end of the hoses? Who makes them, and where do they attach? Thanks for your help.
Two things really speed up the flow thru a 1/4" hose. One is the removal of the scrader valve core and the other is the removal of the valve core depressor inside your hose ends.
Imagine driving down the road at sixty miles an hour and all of a sudden .... there is traffic stalled up ahead.
All you see if brake lights for half a mile or more.
When you finally get your turn to drive up near the action ... you notice a baricade has been placed in the road!
And one by one, cars are having to single file navigate their way thru this device which has only served to slow them all down!
Then once past the device ... you are traveling fast once again!
That's what the valve core depressor does to refrigerant flow within your hose end.
That's what the scrader valve core does to refrigerant flow within the line your hose is attached to the system.
Another issue is losing freon when you go to remove your hi side hose from the pressurized system.
This has been a serious issue for techs for many years.
In the begining, there was little that could be done about it.
You simply had to do it fast and hope you didnt lose much.
Then someone invented a single valve core depressor device which screwed onto the scrader vale and depressed the core. It allowed the tech to attach his hi side hose to the system via this valve and read the pressure inside.
Once he or she ... or in Jack's case "it" ..... had completed their readings ... they simply turned the valve device and that relieved the pressure on the scrader vale core. Then the technician slowly opened his hi side service valve and allowed the freon to bleed over into the lo side of the refrigeration system he was servicing.
This enabled the tech to prevent loss of gas and preserve the freon charge on the smaller critically charged systems.
(you do know about "Jack".... don't you?)
Finally someone invented these little brass goodies which screw onto your hose ends and they are a bit fatter than your normal hose end.
They depress the scrader valve core so as to allow access to pressure readings inside the sealed system.
Also, they allow for easy removal of the hoses and the tech can bleed the hi side into the lo side, still preserving the integrity of the charge within the system.
Does that answer your question?
