Emerson Anderson Greenwood 95 Series Installation And Maintenance Instructions Manual

ANDERSON GREENWOOD SERIES 95 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

Before installation these instructions must be fully read and understood

The safety of lives and property often depends
on the proper operation of the pressure relief
valve. The valve must be maintained according to
appropriate instructions and must be periodically
tested and reconditioned to ensure correct function.

WARNING

Removal of the seal wires in an attempt to adjust
and/or 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

Installation and Maintenance Instructions for
Anderson Greenwood Series 95 Pilot Operated
Safety Relief Valves (POSRV).
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.

SAFETY PRECAUTIONS

When the pressure relief valve is under pressure
never place any part of your body near the pilot
exhaust nor the outlet of the main valve.
The main valve outlet should be piped or vented to
a safe location.
Always wear proper safety gear to protect head,
eyes, ears, etc. anytime you are near pressurized
valves.
Never attempt to remove the pressure relief valve
from a system that is pressurized.
Never make adjustments to or perform
maintenance on the pressure relief valve while
in service unless the valve is isolated from the
system pressure. If not properly isolated from the
system pressure, the pressure relief valve may
inadvertently open resulting in serious injury.
Remove the pressure relief valve prior to
performing any pressure testing of the system.

Instructions as well as applicable National and
International Codes and Standards.

STORAGE AND HANDLING

Pressure relief valve performance may be
adversely affected if the valve is stored for an
extended period without proper protection.
Rough handling and dirt may damage, deform,
or cause misalignment of valve parts and may
alter the pressure setting and adversely affect
valve performance and seat tightness. It is
recommended that the valve be stored in the
original shipping container in a warehouse
or as a minimum on a dry surface with a
protective covering until installation. Inlet and
outlet protectors should remain in place until
the valve is ready to be installed in the system.

Emerson.com/FinalControl

© 2017 Emerson. All rights reserved.

Engineering Doc. #05.9040.083 Rev. E

VCIOM-06026-US 14/12

ANDERSON GREENWOOD SERIES 95 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

FIGURE 1

Pilot vent

Dome (top of the piston)

Pilot

Auxiliary setting device

Bonnet vent

Field test

Check
valve

1 GENERAL VALVE DESCRIPTION

Refer to Figure 1

The Anderson Greenwood Series 95 Valve
consists of a main valve and pilot. The main
valve has an unbalanced piston with O-ring
seat. Tank pressure is applied to the top of the
piston by means of the pilot. The area of the top
of the piston is larger than the bottom and the
valve remains closed.
When the tank pressure increases to the
set pressure of the pilot, the pilot opens and
vents the pressure from the top of the piston.
Theforce acting on the bottom of the piston is
now greater than that acting on the top and the
valve opens.
When the tank pressure decreases to the
closing pressure of the pilot, the pilot closes
and tank pressure is directed to the top of the
piston. The force acting on the top of the piston
is now greater than the force on the bottom and
the valve closes.

Outlet

O-ring seat

P (Tank)

P (Tank)

Inlet (tank pressure)

Tank pressure
sense line

Main valve

Unbalanced
piston

2

ANDERSON GREENWOOD SERIES 95 PILOT OPERATED SAFETY RELIEF VALVES

InstallatIon and MaIntenance InstructIons

FIGURE 2

Item Description

1 Auxiliary setting device
2 Supply tubing
3 Pilot exhaust tubing
4 Pilot bracket bolt
5 * Pilot
6 Pipe nipple
7 Field test hand valve
8 Field test plug
9 Connector
10 Check valve
11 Connector
12 Connector
13 Close tee
15 Check valve
16 Connector
17 Connector
18 Pipe plug
19 Body bolt
20 Lock washer
21 Upper body
22 * Diaphragm
23 * Washer
24 Spring pin
25 Lower body
26 Body
27 Spring
28 Ball
29 O-ring

[1]

30

Gasket

Auxiliary setter, with field test and backflow preventer

Indexed in order of disassembly

2 ACCESSORY MAINTENANCE

Refer to Figure 2

The accessories used on the Series 95 are
the auxiliary setter, field test and backflow
preventer. The field test and backflow preventer
are always used; the auxiliary setter is optional.
Only the backflow preventer, which consists of

[2]

one

diaphragm type check valve and a ball
check valve requires maintenance. Normal
maintenance is to clean the check valves and
replace the diaphragm, washer, gasket

[1]

and
O-ring.
When replacing the diaphragm, care should
be taken not to damage the diaphragm. To
assemble the diaphragm type valve, uniformly
tighten the body bolts, first one side, then the
opposite side. Do not overtighten the bolts as this
will distort the diaphragm and cause leakage.

NOTES

1. Gasket used on some check valves. If check valve
has gasket, use gasket supplied in repair kit ­otherwise discard kit gasket.

2. Some earlier model valves use two diaphragm
check valves and no ball check valve.

* Recommended spare parts for repairs

3