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Medical Gas Supply System
NOTE - By closing service valve, manifold's line pressure
sensor (Item 25, Figure 1) is also isolated. Cycling
manifold to vent residual dome bias pressure will
also vent pressure shown on manifold's line pressure
sensor. Actual outlet pressure supplied by manifold is
not affected by following procedure.
NOTE - Dome regulator's red locking ring must be
pulled out away from regulator body before adjustment
knob can be turned. After adjustment, push locking
ring inward to lock knob. Since dome regulator is self-
relieving, it is recommended dome regulator always be
increased to desired pressure. For example, if dome
regulator pressure is too high, first lower pressure
to approximately 30 psi. Then increase pressure to
between 40-45 psi. Rotate the regulator handle to
adjust the pressure and pressure value can refer to the
pressure gauge.
Red Locking
Ring
4.5.2
2
stage pressure regulator adjustment
nd
Following procedure describes process of setting 2
stage pressure regulator pressure. This procedure
should only need to be performed if 2
regulator pressures are not within acceptable limits
during performance verification procedure or after
servicing the 2
stage pressure regulator with service
nd
kit. When shipped from factory, both sides line
isolation valves and intermediate isolation valves are
in open position. Refer to Figure 15 for location of
components called out in this procedure.
NOTE - If both sides line isolation valves and
intermediate isolation valves are open, manifold's
line pressure gauge will indicate pressure of 2
stage pressure regulator with highest setting. Verify
setting of each regulator individually as described in
following procedure.
4.5.2.1 Remove the front cover.
4.5.2.2 Open the left side line isolation valve and
intermediate valve to keep the left 2
online and close the right side isolation valve and
intermediate valve to isolate the right 2
pressure regulator. See Figure 26.
Pressure
Gauge
Regulator
Handle
nd
stage pressure
nd
nd
stage regulator
nd
stage
nd
Figure 26 - Isolating the Right 2
Regulator.
4.5.2.3 Slightly open vent valve (less than 1/4 turn) to
create a small flow of gas through manifold.
4.5.2.4 Using a 16 mm wrench, loosen the left 2
pressure regulator locknut.
4.5.2.5 Using a 5 mm Hex Key wrench, turn the left 2
stage pressure regulator. Turn anti-clockwise to reduce
the set point and turn clockwise to increase the set point.
Adjustment
Screw
4.5.2.6 Adjust Screw to achieve an appropriate line
pressure gauge reading. Note reading for later use.
Refer to Table 5 for typical pressure settings.
CAUTION! If used as a backup manifold it would
be recommended to set the line pressure at least 0.02
MPa below the main supply source pressure at full
design flow, to ensure the manifold does not supply the
pipeline during normal primary source operation.
4.5.2.7 Tighten the left 2
locknut.
4.5.2.8 Rotate both the left and right isolation ball
valves handle to below position, and set the right 2
stage pressure regulator to the same pressure with the
left one.
31
Stage Pressure
nd
Vent
Valve
Line
Isolation
Valve
2
Stage
nd
Pressure
Regulator
Intermediate
Isolation Valve
nd
Lock
Nut
stage pressure regulator
nd
4109992459.00
stage
nd
nd
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