Emerson Anderson Greenwood 81P, Anderson Greenwood 81P Series Maintenance Instructions Manual

ANDERSON GREENWOOD TYPE 81P DSO PRESSURE RELIEF VALVES

MAINTENANCE INSTRUCTIONS

Before installation these instructions must be fully read and understood

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

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.

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.

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 counter­clockwise.

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.

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.

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

Emerson.com/FinalControl © 2017 Emerson. All rights reserved.

Engineering Doc. #05.9040.072 Rev. K

VCIOM-01056-EN 16/12

ANDERSON GREENWOOD TYPE 81P DSO PRESSURE RELIEF VALVES

MAINTENANCE INSTRUCTIONS

Spring washer

Vent

Plug

Spring

Body

Guide seal

Seal

Cap

Pressure adjustment screw

Spindle seal

Spindle skirt

Spindle

Guide

Outlet

Nozzle

Seat

Drag seal

Seat retainer screw

Seat detail

(-4 illustrated)

Bushing seal

Bushing

FIGURE 1

-4, -8 ORIFICE

2.4 Soft goods repair kit

The part numbers for soft goods repair kits are listed below. Each kit contains the seat and

seals for all pressure ranges and the lubricant specified in paragraph 2.3.

MATERIAL

Orifice NBR FKM EPR

-4 04.4805.029 04.4805.032 04.4805.071

-8 04.4805.029 04.4805.032 04.4805.071

2