Pilot Maintenance - Emerson ANDERSON GREENWOOD 93 Series Installation And Maintenance Instructions Manual

ANDERSON GREENWOOD SERIES 93 POSITIVE PRESSURE POSRV
INSTALLATION AND MAINTENANCE INSTRUCTIONS
PARTS LIST
Item Description
2 Retainer plate
5 Guide
7 O-ring, seat*
8 Diaphragm*
10 Retainer, diaphragm
15 Nozzle
17 Deflector
18 Gasket, deflector*
19 Guide bolt
20 Gasket cap*
* Recommended spare parts for repair
3 PILOT MAINTENANCE (REFER TO
FIGURES 3 AND 4)
3.1 Disassembly
To facilitate assembly, place all parts removed
in an orderly arrangement so the correct parts
are assembled in the proper sequence. Refer to
Figure 3 for parts description and location.
3.1.1 Begin by removing spring bonnet
(Remove the spring compression before
attempting to removing bonnet).
Remove case bolts and upper case.
Loosen tube fittings on boost tube at
lower case and body. Remove spindle
nut while holding hex spacer. Remove
diaphragms, sense and boost plates
and spacers. Remove lower case
and spindle/seat assembly. Remove
blowdown adjustment screw and supply
port tube fitting.
Note: shim washers (33) may be in
assembly to accomplish proper stack
height. If so, note location and quantity.
3.1.2 Clean all parts and replace all soft
goods. The spindle/seat assembly
is factory assembled and must be
replaced as a unit. If the nozzle is nicked
or scratched, it should be replaced.
To remove it, use a deep socket.
FIGURE 2A
8", 10" and 12" sizes
3.2 Assembly
Assembly is done in the reverse order of
disassembly.
Lubricate all screw threads and end of spring
adjusting screw that bears against spring
washer. Use Down Corning No. 33 Silicone
grease or equivalent. When assembling pilot,
the following should be observed:
3.2.1 Place seat/spindle assembly (11) into
pilot body.
Install spindle spacer (32) on top of shim
washers. Lay straight edge across pilot
body (14) and check gap between spindle
spacer and straight edge. Add or remove
shim washers (33) as required to have
top of spindle spacer (32) even with top of
body (14).
PTFE diaphragm with deflector
4