Magnum Venus Plastech Flex Molding Process IVx3 MODULE 8018 - Manual (Page 26)

Vacuum Valve Service Module Manual
Rev. 10/2012 Page | 26
Testing the TAS
(Turbo Auto Sprue)
:
Testing TAS for vacuum leak:
1. Load the TAS valve into the Universal Insert Adaptor port.
2. Connect the INJECT Output on the control box to the TAS supply port using 4 mm tube.
3. Operate the switch on the Service Module and put the valve in the INJECT
position. Ensure the actuator shaft assembly moves freely through its full range of
travel and that the top of the shaft is visible.
4. Put the switch on the Service Module into the Closed position.
5. Open the isolation valve on the Service Module and then adjust the vacuum level at
the universal insert to the maximum level (80% + vacuum). If this level cannot be
reached, do the following:
a. Check the test equipment by plugging the universal insert and ensuring a high
vacuum can be achieved.
b. Check the two O-rings (3265) are in good condition.
If this is not the problem, the valve seal is leaking an unacceptable amount and the
valve fluid section should be serviced.
6. Once a suitable vacuum level is reached, close the isolation valve on the Service
Module to isolate the vacuum source. Adjust the vacuum level to zero / Off.
7. Ideally the level on the vacuum gauge should remain stationary and the vacuum
should be maintained.
8. Open the vacuum Isolation valve to remove the vacuum.
NOTE: It is important that the valve does not leak in production; air could be
drawn into the part during the curing cycle.
Pressure Testing the TAS:
1. For TAS testing use the fittings to block the Flush/Purge line.
2. Connect the Resin Inlet to the pressure output on the Service Module (6–7 bar /
87-100 PSI)
3. Connect Inject signal from selector to the TAS signal.
4. When the valve is closed use soapy water around nose/body to check for leaks.
Point nose away from yourself and others and then open/close a number of
times to check the actuator exhausting air and then repeat the leak test and cycling
a number of times to ensure the valve is ok.