Emerson Anderson Greenwood 81P User Manual

ANDERSON GREENWOOD TYPE 81P DSO PRESSURE RELIEF VALVES
MAINTENANCE INSTRUCTIONS
1 GENERAL
The Anderson Greenwood Type 81P Direct
Spring Operated (DSO) Relief Valve is a direct
acting spring loaded valve for liquid 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
Operational Safety Instructions (available at
www.valves.emerson.com) should be fully read
and understood before returning this product to
service after maintenance.
2 VALVE REPAIR (-4, -8 ORIFICE)
Refer to Figure 1
2.1 Disassembly
2.1.1 Relieve spring tension by turning the
pressure adjusting screw counter-
clockwise.
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. Remove
spindle seals.
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 deforms easily.
LUBRICANTS
Part Set pressure Lubricant
Spindle seals 50-1000psig (3.4 - 69.0barg) Dow Corning FS3451
Above 1000psig (69.0barg) Desco 600
Thread and adjusting bolt tip All Dow Corning 33
Engineering Doc. #05.9040.072 Rev. K
Before installation these instructions must be fully read and understood
WARNING
An attempt to repair this product by unauthorized
or unqualified persons voids the product warranty
and may cause damage to equipment and serious
injury or death to persons.
The product is a safety related component
intended for use in critical applications.
Theimproper application, installation or
maintenance of the product or the use of parts
or components not manufactured by Anderson
Greenwood may result in a failure of the product.
Any installation, maintenance, adjustment, test,
etc. performed on the product must be done
in accordance with the requirements of all
applicable Anderson Greenwood procedures and
instructions as well as applicable National and
International codes and standards.
VCIOM-01056-EN 16/12
TABLE OF CONTENTS
1. General ........................................................... 1
2. Valve repair (-4, -8 orifice) ............................ 1
3. Valve repair (G, J orifice) ............................... 3
4. Valve adjustment ........................................... 4
5. Seat leakage .................................................. 5
2.3 Assembly
Assemble in reverse order of
disassembly. Lubricate the parts listed
below with the specified lubricant. Make
sure the nozzle is fully and squarely
seated in guide.
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Emerson Anderson Greenwood 81P Specifications

General

Temperature Range	-20°F to 250°F
Body Material	Stainless Steel
Trim Material	Stainless Steel
Connection Type	Flanged
Standards	ASME

Summary

General Information and Safety

Safety Warnings

Highlights risks of unauthorized repair, product failure, and importance of adhering to standards.

Product Description

Describes the Type 81P DSO Relief Valve as a direct acting spring loaded valve for liquid service.

Valve Repair Procedures

Disassembly for -4, -8 Orifice Valves

Steps to relieve spring tension and disassemble valve components for repair.

Repair for -4, -8 Orifice Valves

Instructions for replacing the seat and polishing the nozzle for optimal sealing.

Assembly for -4, -8 Orifice Valves

Guidance on reassembling the valve in the reverse order of disassembly.

Soft Goods Repair Kits

Lists part numbers for soft goods repair kits, including seats and seals for various orifices.

Disassembly for G, J Orifice Valves

Procedure for disassembling G and J orifice valves, including relieving spring tension.

Repair for G, J Orifice Valves

Instructions for seat replacement and nozzle polishing for G and J orifice valves.

Assembly for G, J Orifice Valves

Steps for reassembling G and J orifice valves after repair.

Valve Adjustment and Testing

General Adjustment Information

Notes that only set pressure is adjustable, while reseat pressure is fixed.

Proof Test Procedure

Describes checking seals for integrity using pressurized air and soap solution.

Set Pressure Adjustment for Liquid Valves

Details the process for setting liquid valves using water and a pressure vessel.

Adjustment Tolerances

Specifies tolerance limits for set pressure and cracking pressure based on pressure ranges.

Adjustment Tolerances for Air Valves

Lists adjustment tolerances for air valves across various set pressure ranges.

Seat Leakage Troubleshooting

Leakage Checks After Repair

Lists checks for seat leakage, including seating, foreign particles, and correct seat material.

Seat Sealing Procedure

Procedure for heat-treating PTFE seated valves to improve seat tightness.