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Medical Gas Supply System
6.5
2
Stage Pressure Regulator
nd
Maintenance.
WARNING! Vent all inlet pressure and outlet
pressure to 0 psi prior to servicing the regulator.
WARNING! Service must be performed in a clean
environment, free of any oils and grease (hydrocarbons).
- Gloves must be worn to preserve cleanliness of internal
regulator components.
- Use care to not damage the regulator's sealing surfaces.
Scratches or other damage to certain surfaces may
render regulator non-repairable.
NOTE - 2
stage regulator maintenance can be
nd
performed with the associated bank isolated, while
running on the opposite bank of the manifold.
Following procedure describes process to service 2
stage pressure regulator. If necessary, regulator service
can be performed while manifold is in service. However,
this should only be done by qualified technicians
experienced in servicing medical equipment.
6.5.1
If the optional service mode is selected during
maintenance, complete steps in 6.1.
6.5.2
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 38 shows example of left 2
maintenance, mirror to opposite side for working on the
right bank.
6.5.3
Vent all inlet and outlet pressure of line regulator
to 0 psi by pressing the bank bleed valve.
6.5.4
Using a 16 mm wrench, loosen 2
pressure regulator locknut.
Figure 38 - Isolating the Left 2
Line
Isolation
Valve
Bank bleed
valve
Intermediate
Isolation
Valve
4109992459.00
stage regulator
nd
stage
nd
Stage Regulator.
nd
6.5.5
Using a 5 mm Hex Key wrench, turn 2
pressure regulator Adjustment Screw counter-clockwise
to release all spring tension. Remove Adjustment Screw/
Locknut and set aside in clean area.
6.5.6
Using a 51 mm Socket, remove Spring Chamber.
6.5.7
Using a Screwdriver, insert into top of Spring
Chamber past Adjustment Screw threads and push on
Spring Button to push out Piston Diaphragm, Spring and
Spring Icon. Set components aside in a clean area.
6.5.8
Remove Pusher Post Button and set aside.
6.5.9
Using a Plastic Pick, remove Regulator/Body
O-ring. Discard O-ring.
6.5.10 Using the 23 mm Socket, remove Seat Ring by
Discard Seat Ring w/O-ring.
nd
6.5.11 Discard Seat Ring w/O-ring.
6.5.12 Remove Piston Sub-Assembly and discard.
6.5.13 Assemble Pusher Post Button.
6.5.14 Verify that the Seat Spring and O-ring remains in
place within regulator's body.
6.5.15 Install new Seat Ring by screwing it in by hand
while pressing in on the Piston Sub-Assembly. Once
hand tight, use torque wrench to finish tightening to 30
lbf-ft.
6.5.16 Insert new Seat Ring and remove spring pressure
from seat ring during installation by pressing on piston
sub-assembly while screwing in the seat ring.
6.5.17 Assemble Pusher Post Button.
Spring Buttons
1. Piston Diaphragm O-ring
2. Seat Ring w/O-ring (30 lbf-ft)
3. Piston Sub-Assembly
42
stage
nd
Adjustment Screw
Locknut
Spring Chamber (50 lbf-ft)
Spring
Piston
Diaphragm
Pusher Post
Button
Seat Spring
4. Regulator/ Body O-ring
Shaded Items Included in Kit
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