Pilot Maintenance - Emerson Anderson Greenwood 95 Series Installation And Maintenance Instructions Manual

Anderson Greenwood SerieS 95 Pilot oPerated Safety relief ValVeS
InstallatIon and MaIntenance InstructIons

4 pilot MAintenAnce

Refer to Figure 4A
anderson Greenwood recommends the pilot
be returned to the factory for repair or to be
repaired by a factory serviceman in the field.
Normal maintenance is to completely
disassemble the pilot and replace all the
diaphragms, seals and seat. to facilitate
assembly, place all parts removed in an
orderly arrangement so that the correct
parts are assembled in the proper sequence.
No lubricants are required in the pilot. a small
amount of thread sealant should be used on the
pipe threads to prevent leakage. Ptfe tape is
recommended.
assembly is done in the reverse order of the
disassembly. the following items should be
observed when assembling the pilot:
• The round metal diaphragm is the sense
diaphragm. the clear Ptfe diaphragm is the
boost diaphragm.
• The holes in the spindle diaphragm must be
aligned with all the holes in the body. the
small hole in the lower case must be aligned
with the hole in the body.
• Two of the six case bolts must be assembled
through the holes in the lower case before
it is attached to the body. after attachment
there is insufficient clearance to do so.
• Tighten the spindle nut snugly but not
excessively. three diaphragms are
sandwiched in the spindle/stack assembly
and excessive tightening will damage them.
Hold the hex spacer when torquing the
spindle nut to prevent the stack from rotating.
after the pilot is assembled the set pressure
must be adjusted. refer to Section 5
for instructions.
refer to Section 8 for Soft goods repair kits part
numbers.
for fiGures 4A And 4B
item description
100 Body
110 Nozzle
120 Hex spacer
130 Boost spacer
140 Sense spacer
150 Sense plate
160 Boost plate
170 Spindle spacer
190, 190a Pressure adjuster lock nut
200, 200a Bonnet assembly
[1]
210 upper diaphragm case
220 lower diaphragm case
230 Spacer ring
235a adapter
240 Case bolt
250 lock washer
260 Hex nut
320 Boost tube
330 Connector elbow
340 Body bolt
350 Blowdown needle
370 Hex jam nut
380 retainer plug
390 Blowdown bushing
400 filter screen (not shown)
420 retainer seat
430 retainer ring
440a Hex nut
450 Bonnet insert
[1]
460 Wire (not shown)
470 Seal - ½" diameter (not shown)
item description
490 Washer shim (for stack height)
500 Spindle diaphragm*
510 Sense/boost diaphragm*
520 Sense diaphragm*
550 Spindle
555a extension rod
560 Check plate
570 Seat
580, 580a Bonnet gasket*
610 Body bolt seal*
620 Blowdown seal*
630 Bushing seal*
640 Case gasket*
660 Spindle seal*
680 Spindle gasket*
690 Spindle diaphragm gasket*
730 Seat base - type 95
740 Ball
750 Hex nut
760, 760a Cap
770, 770a Bonnet bolt
780 lock washer
790, 790a Pressure adjustment screw
800 Vent - body (not shown)
805a Vent - plug
810 Vent - connector
815 Vent - tube
820, 820a Spring washer
830, 830a Spring disc
840, 840a Spring
notes
a = used in auxiliary setter
* recommended spare parts for repairs
1. Part of item 200 assembly
refer to Section 8 for Soft goods repair kits part
numbers.
5