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Emerson ANDERSON GREENWOOD 93 Series Installation And Maintenance Instructions Manual page 5

Positive pressure posrv
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ANDERSON GREENWOOD SERIES 93 POSITIVE PRESSURE POSRV
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3.2.2 The holes in spindle diaphragm must
be aligned with all holes in the body.
The small hole in lower case must be
aligned with hole in the body. Two of the
six case bolts for the medium pressure
pilot (Figure 4) must be assembled
though holes in the lower case before it
is attached to the body. After attachment
there is insufficient clearance to do so.
3.2.3 For the medium pressure pilot the hole
in the boost (lower) diaphragm and
spacer ring must be aligned with boost
tube port in lower case. The hole in the
upper diaphragm must be positioned
away from boost tube part.
PARTS LIST
Item
Description
1
Cap
2
Pressure adj. bolt
3
Bonnet
4
Spring
5
Sense plate
6
Upper case
7
Spacer ring
8
Lower case
9
Boost spacer
10
Spindle diaphragm*
11
Seat/spindle*
12
Nozzle
14
Body
15
Vent
17
Check plate
18
Pilot diaphragm*
19
Boost plate
20
Sense spacer
21
Blowdown needle
22
Seal, body bolt*
23
Filter screen
26
Bonnet gasket*
27
Boost tube seal*
28
Diaphragm gaskets*
29
Bushing seal*
30
Blowdown seal*
31
Spindle seal*
32
Spindle spacer
33
Shim washer
* Recommended spare parts for repair
3.2.4 Before tightening spindle nut, align
holes in lower case, spacer ring and
diaphragms with case bolts.
Tighten spindle nut snugly but not
excessively. Three diaphragms are
sandwiched/stack assembly and
excessive tightening will damage them.
Hold the hex spacer when tightening
spindle nut to prevent the stack from
rotating.
Refer to paragraph 8 for Soft goods repair kits
FIGURE 3
A
Type 93
(Rubber seat)
View A-A
A
Exhaust
5

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