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ANDERSON GREENWOOD WHESSOE 4110A VACUUM RELIEF VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
INSTALLATION
4110A Vacuum Relief Valves must be mated
with the appopriate flange.
1. These valves must be gasketed and bolted to a flat
machined horizontal flange, bolts to be tightened
uniformly to ensure a good seal.
2. This valve does not contain any internal packing.
Therefore internal checks should not be
necessary.
3. It is recommended that carbon steel and cast iron
valves be given a coat of paint immediately after
installation is complete. Apply paint to external
surfaces only.
MAINTENANCE: (DURING ATMOSPHERIC
VENTING PERIOD)
WARNING
Relief valve must be isolated from tank pressure
before servicing. All gas must be blocked and
pressure safely vented.
Wear appropriate gloves and/or breathing
apparatus if hazardous vapours are present.
1. Remove cover (item 4) inspect O-ring for damage
and replace if necessary.
2. Remove pallet assembly to inspect pallet seating for
wear and replace if necessary.
3. To replace damage/worn items from pallet
assembly (see recommended spares)
a. remove nut from pallet stem, remove support
disc, diaphragm and backing disc
b. clean pallet surface and threads
c. replace with new parts
d. reassemble in reverse order
4. Inspect valve seat (item 3) for wear and regrind or
replace where necessary.
5. Clean seating surface thoroughly with suitable
solvent and apply a thin smear of light spindle oil.
6. Generally clean inside of valve, remove all foreign
matter and repaint exterior where possible to
prevent corrosion.
7. Replace pallet (with lead disc if fitted)
8. Replace valve cover and replace sealing washers if
necessary, secure with screws.
9. It is not necessary to remove the blanking plate
(item 2).
CAUTION
The end of the pallet stem must engage the stem
guide in the cover to ensure correct seating and
valve operation.
NOTE
The efficiency of the valve depends on maintaining
good seating surfaces, therefore, maintenance periods
should be adjusted to suit service conditions.
SPARES
When spare parts are required the customer
should quote the valve size, serial number,
the item number and the material of the parts
required.
The valve size and serial number can be
obtained from the valve identification label. The
item number and description can be obtained
from the arrangement on page 2.
Care should be taken to quote the correct
material as the materials quoted are for non-
hazardous conditions.
RECOMMENDED SPARES
1. Item 6 Nitrile O-ring
2. Item 7 Sealing Washers
3. Item 11 Spacer Disc (Non-Asbestos Fiber)
4. Item 12 Diaphragm Backing Disc (Non-Asbestos
Fiber)
5. Item 13 Diaphragm PTFE
