Emerson ANDERSON GREENWOOD User manual

SAFETY PRECAUTIONS
Read and understand this instruction manual
before installing, operating or performing
maintenance on a 121FSV pressure and vacuum
relief valve. Follow all precautions and warnings
noted herein when installing, operating or
performing maintenance on this equipment.
Safety precaution definitions
CAUTION
Damage to equipment may result if this
precaution is disregarded.
WARNING
Direct injury to personnel or damage to
equipment that can cause injury to personnel may
result if this precaution is not followed.
NOTE
This manual is issued for guidance only and does not
affect our standard terms and conditions and our
product limited warranty, all of which are available
upon request.
Read Anderson Greenwood Marvac general instructions before continuing
ANDERSON GREENWOOD MARVAC FIGURE 121FSV PRESSURE AND VACUUM RELIEF VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Emerson.com/FinalControl © 2017 Emerson. All rights reserved. VCIOM-04095-EN 18/01
1 INSTALLATION
121FSV pressure and vacuum relief valves
must be mated with the appropriate flange.
1. These valves must be gasketed and bolted
to a flat machined horizontal flange. Bolts
must be tightened uniformly to ensure a
good seal.
2. The exhaust pipework which is to be
gasketed and bolted to the horizontal flange
must not be supported by the valve, i.e.
these valves are not designed to carry any
external loads.
3. This valve does not contain any internal
packing. Therefore, internal checks should
not be necessary.
4. It is recommended that carbon steel valves
be given a coat of paint immediately after
installation is complete. Apply paint to
external surfaces only.
2 MAINTENANCE (DURING ATMOSPHERIC
VENTING PERIOD)
WARNING
The relief valve must be isolated from tank
pressure before servicing. All gas must be
blocked and pressure vented safely.
Wear appropriate gloves and/or breathing
apparatus if hazardous vapors are present.
Pressure relief (refer to Figure 1)
1. Remove pressure cover (item 15), 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 damaged/worn items from pallet
assembly (see recommended spares):
a. remove nut from pallet stem, remove
support disc, diaphragm & backing disc
b. clean pallet surface and threads
c. replace with new parts
d. reassemble in reverse order
4. Inspect valve seats (item 3) for wear and
regrind or replace where necessary.
5. Clean seating surface thoroughly with
suitable solvent.
6. Generally clean inside of valve, remove all
foreign matter and repaint exterior where
possible to prevent corrosion.
7. Replace pressure pallet on pressure seat
(with lead disc if fitted).
8. Replace pressure cover & replace sealing
washers if necessary, secure with screws.

2
ANDERSON GREENWOOD MARVAC FIGURE 121FSV PRESSURE AND VACUUM RELIEF VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3 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 3.
Care should be taken to quote the correct
material as the materials quoted are for non
hazardous conditions.
Vacuum relief (refer to Figure 1)
1.
Remove bonnet cap (item 6) and note exact
position (height) of adjustment screw (item7)
inspect O-ring for damage and replace if
necessary.
2. Remove locknut (item 8) and unscrew
adjustment screw.
3. Remove spring bonnet (item 5) and spring
assembly, inspect O-ring for damage and
replace if necessary.
4. Remove pallet assembly to inspect pallet
seating for wear and replace if necessary.
5. To replace damaged/worn items from pallet
assembly (see recommended spares):
e. remove nut from pallet stem, remove
support disc, diaphragm & backing disc
f. clean pallet surface and threads
g. replace with new parts
h. reassemble in reverse order
6. Inspect valve seat (item 3) for wear and
regrind or replace where necessary.
7. Clean seating surface thoroughly with
suitable solvent.
8. Generally clean inside of valve, remove all
foreign matter and repaint exterior where
possible to prevent corrosion.
9. Replace in reverse order.
10.
Reset adjustment screw to its original position
(height), tighten locknut and replace cap.
11. Check vacuum relief setting on test run and
adjust if necessary.
CAUTION
The end of the pallet stem must engage the stem
guide in the covers 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.
Recommended spares
1. Item 14 Nitrile O-ring
2. Item 13 Sealing washers
3. Item 19 Spacer disc (non-asbestos fiber)
4. Item 20 Diaphragm backing disc (non-
asbestos fiber)
5. Item 21 Diaphragm (PTFE)

3
Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product.
Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Emerson Automation Solutions, Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their
respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by
our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without
notice.
Emerson.com/FinalControl
ANDERSON GREENWOOD MARVAC FIGURE 121FSV PRESSURE AND VACUUM RELIEF VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
FIGURE 1
PARTS LIST
Item Description Alum spec. C. steel SS. spec
1Valve body inlet Aluminum WCB 316 SS
2Valve body outlet Aluminum WCB 316 SS
3Removable seat Aluminum 316 SS 316 SS
5Spring bonnet Aluminum WCB 316 SS
6Bonnet cap Aluminum WCB 316 SS
7Adjustment screw 316 SS 316 SS 316 SS
8Locknut 18/8 SS 18/8 SS 18/8 SS
9Spring washers 316 SS 316 SS 316 SS
10 Spring 316 SS 316 SS 316 SS
11 Cap screws ZP Steel ZP Steel 18/8 SS
12 Bonnet screws ZP Steel ZP Steel 18/8 SS
13 Sealing washers G fiber G fiber G fiber
14 O-ring seal Nitrile Nitrile Nitrile
15 Cover Aluminum WCB 316 SS
16 Pallet 316 SS 316 SS 316 SS
17 Pallet stem 316 SS 316 SS 316 SS
18 Pallet guide posts 316 SS 316 SS 316 SS
19 Spacer disc Non-asbestos Non-asbestos Non-asbestos
20 Diaphragm back. disc Non-asbestos Non-asbestos Non-asbestos
21 Diaphragm PTFE PTFE PTFE
22 Diaphragm supp. disc 316 SS 316 SS 316 SS
23 Screen St. St St. St St. St
M/D type seating