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ANDERSON GREENWOOD SERIES 9300 PILOT OPERATED SAFETY RELIEF VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
1.6 SIZE/PRESSURE RANGES OF SERIES 9300 PRESSURE/VACUUM RELIEF VALVES
Materials
Main valve soft goods
Pilot soft goods
Set pressure range
Vacuum range
Process temperature
Size
Blowdown - (fixed or variable)
1.7 Basic pilot series for the 9300 main valve
1.7.1 Series 91 Pilot
The Series 91 was designed for specific
applications where FEP diaphragms alone were
not rugged enough and premium sealing was
required for super cryogenic fluids. Series 91
design includes stainless steel (SS), and PTFE
diaphragms which provide extraordinary
performance for hard to hold cryogenic fluids.
1.7.2 Series 93 Pilot
The Series 93 is a pilot operated pressure
relief valve designed with elastomer seats
and seals, and construction materials in
aluminum (AL), carbon steel (CS), and stainless
steel (SS). These construction materials satisfy
the majority of gas piping and chemical tank
applications. The Series 93 pilot can be used
on any Series 9000 valve except a combination
9000 larger than 6".
1.7.3 Series 93T Pilot
The Series 93T was an offshoot of the Series
93, designed specifically for cryogenic and
chemical applications where an elastomer seal
is not satisfactory.
1.7.4 Series 400B
The Series 400B is used with 8", 10", and
12" combination weight-loaded vacuum and
pressure valves where quick relieving of dual
chamber diaphragms is required to open
the main valve.
2 MAIN VALVE
2.1 General main valve maintenance
Since the Series 9300 valve can be either a
pressure only, vacuum only, or pressure/
vacuum relieving device, it is built in a modular
fashion. The standard single diaphragm unit
will function on pressure and vacuum, however,
opening under very low vacuum requires use of
the auxiliary diaphragm chamber. The valve can
also be repaired in a modular fashion. The seat
can be replaced without complete disassembly
of the diaphragm cases. Selective repair can be
performed as required.
Prior to disassembly of the main valve
or pilot, it is recommended to stamp or
mark the location of the pilot, and the
orientation of the diaphragm cases, studs,
and column supports to the main valve body.
AL, CS, SS
PTFE Diaphragm seat and seals
Elastomer or all PTFE Soft goods
4" wc to 50 psig (9.9 mbarg to 3.45 barg)
-1.73" wc to -14.7 psig (-4.3 mbarg to -1.01 barg)
-320°F to 200°F (-196°C to 93°C)
2" to 12"
This practice will ensure proper alignment and
location of parts during reassembly.
To prevent mixing up parts it is recommended
to repair the main valve and pilot in stages.
For this reason, the diaphragm, nozzle, and seat
maintenance and/or replacement instructions
are separate from the pilot instructions.
2.2 Main valve single chamber diaphragm
disassembly (Refer to figure 1)
1. Remove the pilot (as a unit) and the tubing
from the diaphragm case. Set them aside.
Note: match mark orientation of tubing and
case assembly to the body. This will assist in
reassembly.
2. Unscrew the case bolts (700/710) and
remove the upper diaphragm case (210).
3. On valve sizes 2" through 4", remove the
diaphragm assembly, lower case (280), shaft
(320) and seat plate assembly from the main
valve body (100).
4. On valve sizes 6" and larger, remove seat
plate assembly from shaft (320) prior to
removing diaphragm assembly, lower
case (280), and shaft (320). To remove, spin
diaphragm plate assembly counterclockwise
while holding seat plate assembly stationary
until shaft (320) is free of seat hub (420).
The seat plate assembly should then rest on
nozzle (460).
5. On valve sizes 6" and larger, remove
diaphragm assembly and shaft (320) from
lower case (280). Then remove lower case
from the body (100).
6. On valve sizes 6" and larger, lift seat plate
assembly from the body (100).
CAUTION
When removing seat plate assembly, be careful
not to damage the nozzle (460).
7. Unscrew counterclockwise the seat plate
assembly from the main shaft (320). This is
normally a hand operation, however, a
(14.3 mm) wrenching flat is provided on the
seat hub (420). The connecting thread will
run free, then tighten, and run free again as
it disengages from a locking helicoil (330)
in the vertical shaft (320). This will allow the
seat plate assembly, diaphragm assembly
and lower case (280) to be separated.
8. Holding the shaft (320) stationary, remove
the jam nut (520) from the diaphragm
assembly. Remove the diaphragms
(170, 175, 950, 960), washers (580, 590, 600),
gaskets (620), plates (150, 160), and lower
case (280) (as a unit) from the shaft (320).
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