© Copyright 03/31/2021 MOGAS Industries, Inc.
www.mogas.com
30
Re-Assembly
CAUTION!
The gland flange
must
be pushed in evenly to
prevent “cocking” or side loading, as this could
cause damage to the packing and prevent the
valve from operating properly.
Watch the gland flange to ensure that it remains
perpendicular
to the stem, and the gap around
the stem remains
concentric
during the tightening
process.
Do not over-tighten nuts. Torque all nuts
evenly
per the specifications included with the
test
certificate
for each individual valve serial number.
TIGHTEN GLAND FLANGE NUTS
Use a proper squence to tighten the gland flange nuts
17
.
17
PRESSURE TESTS
Move valve to test stand.
Hydrostatic Shell Test
This test is performed at MOGAS while the ball is
partially open. This test is not possible at the field. If
partially opening the ball is not possible due to high
initial torque, pressure the valve from one side to
about 1000 psi while ball is closed. This will reduce
the initial breaking torque significantly. Partially open
the ball to start the Hydro shell test.
Refer to MOGAS test certificate for pressures or
allowable leak rates.
Seat Leakage Test
Verify that the valve is fully closed. Conduct a seat
leakage test at 1.1 CWP (cold working pressure)
18
