ANDERSON GREENWOOD SERIES 81 SPRING OPERATED PRESSURE RELIEF VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
© 2017 Emerson. All Rights Reserved.
Before installation these instructions must be fully read and understood
Emerson.com/FinalControl
Installation and Maintenance Instructions for
Series 81 Spring Operated Pressure Relief
Valves (SOPRV).
The intent of these instructions is to acquaint
the user with the storage, installation and
operation of this product. Please read these
instructions carefully before installation.
1 GENERAL
The Anderson Greenwood Series 81 Relief Valve
is a direct acting spring loaded valve for gas
service and uses a plastic seat and O-ring seals.
The intent of these instructions is to acquaint
the user with the maintenance of this product.
Please read these instructions carefully. This
product should only be used in accordance
with the applicable operating instructions and
within the application specifications of the
original purchase order. The Installation and
2 VALVE REPAIR (-4, -6, -8 ORIFICE)
Refer to Figure 1
2.1 Disassembly
2.1.1 Relieve spring tension and back
blowdown adjusting screw out two turns.
2.1.2 Remove inlet bushing, bushing seal and
valve internals.
2.1.3 Separate nozzle from guide by hitting top
of spindle on soft surface.
2.2 Repair
2.2.1 Hold spindle by skirt O.D. in soft jaw vise
and replace seat.
2.2.2 Examine nozzle and polish out any
scratches or nicks. Replace if necessary.
2.2.3 To obtain better seat seal with PTFE at
low set pressures, burnish seat against
nozzle by chucking spindle in lathe and
holding nozzle against spindle. Burnish
with small force and for short time as
PTFE readily deforms.
VCIOM-06062-EN 19/03
2.3 Assembly
Assemble in reverse order of disassembly.
Donot lubricate spindle or guide. Make sure
the nozzle is fully and evenly seated in guide.
This is a press fit joint. Lubricate threads and
pressure adjustment screw tip.
2.4 Soft goods repair kit
The part numbers for soft goods repair kits are
listed below. Each kit contains the seat and all
seals for the pressure ranges indicated.
Engineering Doc. #05.9040.071 Rev. N
TABLE OF CONTENTS
1. General........................................................... 1
2. Valve repair (-4, -6, -8 orifice)....................... 1
3. Valve repair (F, G, H and J orifice)................ 2
4. Valve adjustment........................................... 3
5. Seat leakage .................................................. 4
6. Set pressure change..................................... 4
Operational Safety Instructions (available at
Emerson.com/FinalControl) should be fully read
and understood before returning this product to
service after maintenance.
