4
ANDERSON GREENWOOD
5910C PRESSURE/VACUUM RELIEF VALVE WITH INTEGRATED
FLAME ARRESTER (ATEX APPROVED)
FIGURE 2
Rotate from the
vacuum bore on
the outboard screw
CAUTION
DO NOT MATE A FLAT FACE FLANGE TO A
RAISED FACE FLANGE.
If it necessary to mate an ANSI Class 125 F.F.
Flange with an ANSI Class 150 R.F. Flange, use
the proper spacer to convert the raised face to a
flat face.
NOTE
Although steel valves have a standard paint
system, it is recommended that steel valves be
inspected and touch-up applied if necessary.
Apply paint to external surfaces only.
10. Verify that the valve is level to permit proper
operation of the pallets. Install mounting
hardware and tighten uniformly.
11. Use a full faced gasket and tighten all
mounting hardware uniformly.
12. Metal parts insulated by gaskets should be
earthed where necessary.
MAINTENANCE (ASSEMBLING AND
DISMANTLING)
The valve should be inspected and cleaned
at periodic intervals. The first inspection
should be made approximately 30 days after
commissioning. Subsequent inspections should
be made every 30 days. The user may adjust the
schedule for his own convenience and safety,
depending upon the product being stored.
WARNING
• Relief valve must be isolated from tank pressure
before servicing. All gas must be blocked and
pressure safely vented. If no isolation valve is
present, carefully open vacuum cover or lift
pressure pallet, allowing pressure to vent slowly.
• Wear appropriate gloves and/or breathing
apparatus if hazardous vapors are present.
1. To inspect valve proceed as follows:
a. Remove the weatherhood and flame
element assembly and/or cover.
b. Remove pallets one at a time. Identify the
pallets to ensure they are returned to the
correct valve seat.
c. Inspect pallet inserts for ripples, tears,
or nicks, as well as seating surfaces for
debris, abrasion or pitting. Pallet edges
and guide posts should be free or burrs,
corrosion or other obvious damage.
Clean all components, replacing any
showing excess wear or damage.
d. Reassemble in reverse order.
CAUTION
The end of the pallet stem must engage the stem
guide chamber in the flame element assembly
and/or cover for proper seating and valve
operation.
CAUTION
During periods of freezing weather, extra
maintenance is required for 5910C Series. Either
remove the pallets or apply generous portions of
silicone grease to the pallets, seat rings and guide
posts. When using silicone grease, inspect valves
at least weekly. Extra attention must be given to
inspection of the Flame Cell Assembly to ensure
clear and consistent flow.
2. To replace pallet insert proceed as follows:
a. Remove weatherhood and/or cover(s)
and flame element assemblies and then
pallet assembly.
b. Remove nut from base of pallet stem.
Remove retainer plate and insert.
Clean all surfaces and threads. Install
new insert, handling carefully to avoid
damaging insert or pallet.
c. Reassemble pallet and place on seat of
valve body. Ensure pallet assembly moves
freely within guide posts and rests flat on
seat ring.
d. Reinstall flame element assembly,
weatherhood and/or cover(s).
5. Place the valve in a level position. Reach up
through the inlet flange and carefully push
up on the pressure pallet, then lower it onto
the seat. Pallet should move up and down
freely and rest flat on the seat ring.
6. Remove all vacuum element screws from
the body except for the furthest outboard.
Loosen the outboard screw only enough to
allow the vacuum flame element assembly
and gasket to rotate away from the valve
vacuum bore. (Figure 02)
7. Reach up through the vacuum bore and
carefully push up on the vacuum pallet, then
lower it onto the seat. Pallet should move up
and down freely.
8. Rotate the element assembly and gasket
back into place and re-install all screws.
9. Mount the valve on the flanged nozzle using
the appropriate gasket.
CAUTION
The end of the pallet stem must engage the stem
guide chamber in the flame element assembly for
proper seating and valve operation.
3. To replace pressure seat ring perform the
following:
a Remove weatherhood, screen, flame
element assembly, spacer ring (if
applicable), pallet assembly, guide posts,
shroud assembly, and seat gasket.
b. Remove seat ring and O-Ring from valve
body. Clean body, outlet adapter mating
surfaces and O-Ring Groove.
c. Install new O-Ring into groove; ensure
that the O-Ring stays properly in groove
while installing seat ring.
d. Install new seat ring carefully to avoid
distortion. Reassemble seat gasket,
shroud assembly, guide posts and spacer
ring (if applicable) to secure seat. Ensure
that seat is flush and level with valve
body.
e. Place pallet assembly on valve body seat.
Ensure pallet assembly moves freely
within guide posts and rests flat on seat
ring.
f. Reassemble remaining parts in reverse
order.
CAUTION
The end of the pallet stem must engage the stem
guide chamber in the flame element assembly for
proper seating and valve operation.
