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Medical Gas Supply System
NOTE - By closing service valve, manifold's line pressure
sensor (item 19, 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 2 bar. Then increase pressure to between
2.7-3.1 bar.
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
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 27.
Figure 27 - Isolating the Right 2
Regulator.
stage pressure
nd
stage pressure regulator
nd
stage regulator
nd
stage
nd
Stage Pressure
nd
Vent
Valve
Line
Isolation
Valve
2
Stage
nd
Pressure
Regulator
Intermediate
Isolation Valve
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 16 mm wrench, loosen the left 2
pressure regulator locknut.
4.5.2.5 Using 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
nd
4.5.2.6 Adjust Screw to achieve an appropriate line
pressure gauge reading. Note reading for later use.
Refer to Table 6 for typical pressure settings.
CAUTION! If used as a backup manifold it would
be recommended to set the line pressure at least 0.2 bar
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.
4.5.2.9 Tighten the right 2
locknut.
4.5.2.10 Close the vent valve.
25
nd
Lock
Nut
stage pressure regulator
nd
Vent
Valve
Line
Isolation
Valve
2
Stage
nd
Pressure
Regulator
Intermediate
Isolation
Valve
stage pressure regulator
nd
4109992485.00
stage
nd
nd
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