21
•
Be sure to use both a spanner and torque wrench together when connecting/disconnecting pipe
to/from the unit.
NOTE:
Too large torque will harm the bell-mouthing and too small will cause leakage. Please determine the torque according to
the table below. Leak test the unit after finishing the connection.
Tightening Torque N M (Turn clockwise to close)
Stop
Valve size
Shaft (valve body)
Cap
(valve lid)
Maintenance
Nut
Ø 6.4
5.4 ~ 6.6
Hexagonal
wrench 4 mm
13.5 ~ 16.5
11.5 ~ 13.9
Ø 9.5
Ø 12.7
8.1 ~ 9.9
18 ~ 22
Ø 15.9
13.5 ~ 16.5
Hexagonal
wrench 6 mm
23 ~ 27
Ø 22.2
27 ~ 33
Hexagonal
wrench 10 mm
36 ~ 44
Ø 25.4
Table 4 – Service Valve Tightening Torque
6.3 Expelling the air with the vacuum pump
Stop Valve opening / Closing
Opening:
Remove the cap and turn the valve counter-clock wise (with the hexagon wrench)
until the shaft stops. Do not apply excessive force to stop the valve. Doing so may damage the
valve as the valve is not a backseat type. Always use the correct tools. Make sure to tighten the cap
securely.
Closing:
Remove the cap and turn the valve clockwise with the hexagon wrench. Securely
tighten the valve until the shaft contacts the main body seal. Please make sure to tighten the
cap securely and refer to Table 4 for the tightening torque.
Using the vacuum pump
•
Loosen and remove the service port nuts of stop valves A and B, and connect the charging hose of
the manifold valve to the service port of isolation valve A. Ensure that the isolation valves A and B
are both closed.
•
Connect the charging hose with the vacuum pump.
•
Open the Low-side valve of the manifold completely.
•
Turn on the vacuum pump. At the beginning of pumping, loosen the service valve nut of isolation
valve B a little to check for air entering (the sound of the pump will change, and the manifold gauge
reads below zero). Then close the service valve.
•
When evacuation is complete, close the Lo-side valve of the manifold gauge completely and turn
off the vacuum pump. Let the system hold for 15 minutes or more and check that the pressure
does not rise, suggesting a system leak.
•
Loosen and remove the cap of isolation valves A and B to open stop valve A and B completely,
then fasten the cap.
•
Disassemble the charge hose from the service port of the isolation valve A, and fasten the nut.
