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Medical Gas Supply System
6.7
Replace the Intermediate
Pressure Relief Valve.
Intermediate pressure relief valve kit number, see Table
11, chapter 7.
NOTE - Intermediate pressure relief valve can be
performed with the associated bank isolated, while
running on the opposite bank of the manifold.
Following procedure describes process to service
intermediate pressure relief valve. If necessary,
replacement service can be performed while manifold is
in service. However, this should only be done by qualified
technicians experienced in servicing medical equipment.
6.7.1
If the optional service mode is selected during
maintenance, complete steps in 6.1.
6.7.2
Complete the steps in 6.3 to perform this
maintenance with one bank running. If total isolation is
preferred follow steps in 6.2.
NOTE - Figure 40 shows example of left intermediate
pressure relief valve replacement, mirror to opposite
side for working on the right bank.
CAUTION! When exhausting anaesthetic and
oxygen manifolds ensure that the manifold room is well
ventilated and no potential ignition sources are present.
NOTE - If the cylinder pressure gauge is not rapidly
dropping in pressure, stop draining the system and
check all cylinders are correctly isolated.
6.7.3
Switch the duty bank to the side where the
intermediate relief valve will not be replaced. Then close
all the cylinders on one bank of manifold where the
intermediate relief valve will be replaced.
6.7.4
Rotate the intermediate isolation valve to isolate
the 1
stage regulator and the intermediate relief valve
st
on the same side. Refer to Figure 37 for isolating the 1
stage regulator on the left side.
Figure 37 - Isolating the Left 1
Intermediate
Isolation Valve
4109992459.00
Stage Regulator.
st
6.7.5
Vent pressure in the 1
isolated from last step by pressing the bank bleed valve
as shown in figure below.
Bank bleed
valve
6.7.6
Once all the gas has been vented, fully disconnect
the exhaust pipe from the fittings marked in Figure 40.
6.7.7
Remove the relief valve and old connector.
6.7.8
Connect the new relief valve with the new
connector and re-connect the exhaust pipework. Tighten
the vent point fitting.
6.7.9
Follow Section 6.19 or 6.20 depending on
whether the maintenance was performed with total or 1
bank isolation to bring the manifold back online.
6.7.10 Verify the manifold operation. Refer to Section
3.4.
Figure 40 - Intermediate Relief Valve Replacement.
NOTE - Figure 40 shows example of left bank
replacement unit, mirror to opposite side for working
on the right bank.
Vent Point
Fitting
st
Connector
Relief Valve
Fitting
44
stage regulator that is
st
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