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Medical Gas Supply System
Figure 26 Pressure Regulator Adjustment.
NOTE - A small flow is required for regulator adjustments,
see figure 22 in section 3 for reference.
The following procedure describes process of setting
1
stage pressure regulator's "base" pressure. This
st
procedure should only need to be performed if 1
pressure regulator pressures were not within acceptable
limits during performance verification procedure or
after servicing regulator.
Base pressure setting is a mechanical adjustment
controlled by regulator's internal adjusting spring and
is regulator's output pressure without any dome bias.
Recommended settings are listed in Table 7 under
heading of "Intermediate Pressure - Standby Bank". After
base pressure has been set, pressure will be increased
by amount of dome bias pressure.
4.5.1.1 Remove front cover of manifold system (Item 28,
figure 1).
Cover
Latch
4.5.1.2 Close service valve for the control pressure line
(Item 11, figure 1).
4.5.1.3 Press manual changeover icon
Cycle manifold from bank to bank to vent residual dome
bias pressure.
4109992485.00
Rotate
anti-clockwise
to reduce set
point
2
1
Push
to Open
Button
on the screen.
Change
Over Icon
4.5.1.4 Shut off all cylinders on the bank at the opposite
side of the regulator to be adjusted.
4.5.1.5 Slightly open vent valve (less than 1/4 turn) to
create a small flow of gas through manifold.
Vent
Valve
stage
st
4.5.1.6 Use 26 mm wrench, loosen 1
regulator Locknut.
Adjustment
Nut
4.5.1.7 Use 19 mm wrench, set 1
1
regulator to the value specified in Table 7 (Intermediate
Pressure – Standby Bank). Turn anti-clockwise to reduce
the set point and turn clockwise to increase the set point.
Table 7: Regulator Pressure Setting.
Nominal System Design 4 bar
2
Intermediate Pressure
(Standby Bank)
Pull
Dome Bias Pressure
Intermediate Pressure
(Running Bank)
4.5.1.8 Tighten the 1
4.5.1.9 Close the vent valve.
4.5.1.10 If the other 1
needs to be adjusted, repeat steps 4 through 9.
4.5.1.11 Slowly open all cylinders on both manifold
banks.
4.5.1.12 Open service valve and reset dome regulator
(Item 25, figure 1) to 2.7 bar (if dome regulator included).
24
stage pressure
st
Lock
Nut
stage pressure
st
8 bar
4.8 bar
14.5 bar
4 bar
2.7 bar
8.8 bar
17.2 bar
stage pressure regulator Locknut.
st
stage pressure regulator also
st
11 bar
14.5 bar
2.7 bar
17.2 bar
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