Emerson Anderson Greenwood 93T Manuale di istruzioni per l'installazione e la manutenzione - Pagina 3

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ANDERSON GREENWOOD SERIES 93T PILOT OPERATED SAFETY RELIEF VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS

PARTS LIST

Item
Description
1
Diaphragm retainer
2
Cap
3
Seat retainer
4
Nozzle
5
Primary seat
6
Spring pin
[1]
7
Guide spring
8
Dipper tube
9
Guide
10
Body
11
Secondary seat
12
Seat plate
13
Diaphragm
14
Top plate pilot
15
Valve seal
16
Body gasket
17
Nozzle
18
Seal-bolt
1. Used in 6" and larger valves only
2. Used in 3" thru 6" size only
3 PILOT MAINTENANCE (REFER TO FIGURE 3)
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 remove 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
boost plates and spacers. Remove lower
case and spindle/seat assembly. Remove
blowdown adjustment screw and supply
port tube fitting.
3.1.2 Clean all parts and replace all soft
goods. The nozzles used in these pilots
can be reworked, if scratched, by lapping
flat to a 2 microinch finish.
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 Dow Corning No. 33
Silicone grease or equivalent. When assembling
pilot, the following should be observed:
3.2.1 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 body.
[2]
FIGURE 2
3.2.2 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 in the spindle/stack
assembly and excessive tightening will
damage them. Hold the hex spacer when
torquing spindle nut to prevent the stack
from rotating.
PTFE diaphragms are used in the pilot.
Gaskets are used with each diaphragm
to aid in sealing.
Refer to paragraph 8 for Soft goods repair kits.
3