Page 24
7912-A1 Operating Manual
3. Open the seal plate block valve and vessel outlet block valve.
4. Turn the gas vessel diverter valve upward).
5. Turn the gas supply pressure regulator clockwise and monitoring the test
pressure gauge, until it reaches the desired test pressure. Increase pressure
gradually.
4.3.3
Adjusting the valve on the seal plate
If the valve (device under test) needs to be adjusted, do the following while refer-
ring to Figure 2-1 on page 10:
1. Reduce the gas supply pressure control to zero.
2. Open seal plate drain valve slowly to release all remaining pressure within
the system and to drain air or nitrogen from the test piece as needed from
the valve under test.
NOTICE
Failure to open the valve slowly could deform the water tank, making it
unusable for future tests. This damage will invalidate the warranty.
3. Check that test pressure gauge shows 0 psi/bar.
4. Unclamp the valve and reposition as necessary, following the steps in Sec-
4.4
C
ONDUCTING
AN
AIR
OR
NITROGEN
OVER
WATER
TEST
Do the following to run an air or nitrogen over water test, referring to Figure 2-1
on page 10 and Figure 2-2 on page 11:
1. Clamp the valve into the machine, following the steps in Section 3.6 on
2. Close the seal plate block valve and open the vessel outlet block valve.
Turn the vessel diverter valve downward.
3. Close the seal plate drain valve.
4. Open the air supply valve and turn the water supply pressure control clock-
wise while monitoring the vessel pressure gauge to check that no pressure
is building up.
5. Once the vessel has filled with the desired volume, close the vessel outlet
block valve.
6. Open the seal plate block vale.
7. Purge the air from the device under test (review the valve manufacturer’s
manual for instruction on purging the valve).
8. Once the valve is full of water, turn off the water supply pressure control by
turning it counter-clockwise.
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