WARNING
Attempts to adjust and/or repair this product
by unauthorized or unqualified persons void the
product warranty and may cause damage to
equipment and serious injury or death to persons.
This product is a safety related component
intended for use in critical applications. The
improper application, installation or maintenance
of the valve or the use of parts or components not
manufactured by Emerson may result in a failure
of the valve.
ANDERSON GREENWOOD SAFETY SELECTOR VALVES (SPOOL STYLE)
InstallatIon and operatIonal safety InstructIons
INSTALLATION
Many valves are damaged when first placed
in service because of failure to clean the
connection properly when installed. Before
installation, all flange faces or threaded
connections on both the SSV and the
connecting components (vessel, pipe or
pressure relief valve) must be thoroughly
cleaned of all dirt and foreign material.
Because foreign materials that pass into and
through the SSV can damage the seat, the
systems on which the valves are tested and
finally installed must also be inspected and
cleaned. New systems in particular are prone
to contain foreign objects that inadvertently get
trapped during construction and will destroy
the seating surface when the valve flows. The
system should be thoroughly cleaned before
the SSV is installed.
GENERAL
The intent of these instructions is to acquaint
the user with the storage, installation and
operation of this product.
This Safety Selector Valve (SSV) should only
be used in accordance with the applicable
operating instructions and within the application
specifications of the purchase order.
STORAGE AND HANDLING
Because cleanliness is essential to the
satisfactory operation and tightness of an SSV,
precautions should be taken during storage to
keep out all foreign materials. Inlet and outlet
protectors should remain in place until the
valve is ready to be installed in the system. It is
recommended that the valve be stored indoors
in the original shipping container away from dirt
and other forms of contamination.
The SSV should be handled with care and not
subjected to heavy shocks.
Before installation these instructions must be fully read and understood
© 2017 Emerson. All Rights Reserved.Emerson.com/FinalControl VCOSI-01063-EN 17/12
The gaskets used must be dimensionally correct
for the specific flanges. The inside diameters
must fully clear the valve inlet and outlet
openings so that the gasket does not restrict flow.
For flanged valves, draw down all connection
studs or bolts evenly to avoid possible distortion
of the valve body.
The SSV ‘s are shipped from the factory with
one side completely “isolated” and one side
“active”. The position indicator points to the
“active” side. Check that the “active” side is
correct for the initial installation and start-
up operation. See OPERATION below for
instructions to change.
The SSV is designed to minimize inlet pressure
loss to a pressure relief valve. To assure this is
accomplished follow these guidelines:
1. Connect the SSV as direct and close as
possible to the vessel being protected.
2. The SSV should be mounted vertically in an
upright position either directly on a nozzle
from the pressure vessel or on a short
connection fitting that provides a direct,
unobstructed flow between the vessel and
the valve.
3. The SSV should never be installed on a
fitting having a smaller inside diameter
than the inlet connection of the SSV.
The discharge piping should be carried by a
separate support and be properly braced to
withstand reactive thrust forces when the
pressure relief valve relieves. The SSV should
also be supported to withstand any swaying or
system vibrations.
Any installation, maintenance, adjustment, repair
or test, performed on the safety selector valve
must be done in accordance with the requirements
of all applicable Emerson Procedures and
Instructions as well as applicable National and
International Codes and Standards.
The information, specifications and technical data
(the “Specifications”) contained in this document
are subject to change without notice. Emerson
does not warrant that the Specifications are
current and assumes no responsibility for the
use or misuse thereof. The Purchaser should
verify that there have been no changes to the
Specifications prior to use.
