Isolation Valve; Using Charging And Testing Hoses For Evacuation; Testing The Vacuum Pump'SIsolation Valve - JB INDUSTRIES PLATINUM DV-200N Manual De Instrucciones

Now, fill the pump to the proper oil level and allow the pump to run with the isolation
valve closed for 3 or 4 minutes to warm up the oil Check all o-ring caps for dirt
and proper seal Connect a vacuum gauge (JB recommends the DV-22N, DV-41
or DV-40S) directly to the 1/4" port on the intake tee (Figure 9) Do not use a
charging line Open the isolation valve
DO NOT
USE A CHARGING LINE
A charging line, especially a new line, will give you a higher
micron reading because you are reading the environment
inside the hose (Figure 12).
Figures 11 and 12 are the same, but (Figure 11) is a direct connection hook-up
and (Figure 12) is a connection through a new charging line Both hook-ups
are allowed to run the same length of time, but (Figure 11) is at 20 microns
while (Figure 12) is at 297 If left on, the charging line hook-up will come down
in its micron reading, but it will take a much greater period of time If the hose
is cleaned out with alcohol and vacuumed for a long period of time, the micron
reading will go lower

ISOLATION VALVE

It is a quarter turn between on and off There is no additional valve needed to
isolate the system When checking for pressure rise, slowly turn the handle
counter-clockwise The pause position is at 45 degrees and the valve is completely
closed at 90 degrees (Figure 13)
USING CHARGING AND TESTING HOSES
FOR EVACUATION
If a leak is suspected: An evacuation/dehydration hook-up requires a leak-proof
design in all of the components Only soft copper tubing, pure rubber hoses, or
flexible metal hoses are absolutely vacuum tight Charging hoses are designed for
positive pressure Even with the advanced technology of today' s hoses, permeation
through the hose compound still exists (Figure 14)
If you have blanked-off your pump to check pressure rise and your hoses and
connections are not leak-free, the atmosphere will permeate to the lower pressure
in the hoses Your reading will slowly rise and you will spend time looking for
system leaks
TESTING THE VACUUM PUMP'S
ISOLATION VALVE
The easiest way to test the isolation valve for leakage is to turn the pump on with
the isolation valve in the closed position
Step 1: Connect a charging line to the center port of the manifold (Figure 15),
and have the high side capped off and CLOSED and the low side capped
off and OPENED
Step 2: Connect the charging line to the intake of the pump and wait If, within
5 to 10 minutes, you do not see the low (compound) gauge going into
inches of vacuum, there is no leak in the isolation valve
What happens when a micron gauge is connected directly to the intake of a vacuum
pump with an isolation valve is all related to the connections to, and including,
the intake, the volume of what is being vacuumed, the depth of vacuum, and the
length of time that the volume is in the deep vacuum
Figure 11
Figure 12
Pause Position
Closed
Position
Figure 13
CHARGING SYSTEM
Gas under pressure in the
hose will permeate to the lower
pressure of the atmosphere.
Figure 14
Figure 15
JB INDUSTRIES • PLATINUM OPERATING MANUAL • 800.323.0811 • SALES@JBIND.COM • JBIND.COM
Open
Position
EVACUATION
The atmosphere which has a
higher pressure permeates to
the lower pressure in the hose.
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