SEMPELL SPRING OPERATED SAFETY VALVES
Operating and safety instructiOns
Before installation these instructions must be fully read and understood
GENERAL
The intent of these instructions is to acquaint
the user with the storage, installation and
operation of this product.
This Safety Valve should only be used in
accordance with the applicable operating
instructions and within the application
specifications of the purchase order.
These valves have been tested and adjusted at
the factory. Contact the Factory or a Emerson
authorized representative before making any
changes to the settings.
STORAGE AND HANDLING
Because cleanliness is essential to the
satisfactory operation and tightness of a safety
valve, 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. Take care to keep the valve inlet
absolutely clean. It is recommended that the
valve be stored indoors in the original shipping
container away from dirt and other forms of
contamination.
Safety valves must be handled carefully and
never subjected to shocks. Rough handling may
alter the pressure setting, deform valve parts
and adversely affect seat tightness and valve
performance.
The valve should never be lifted or handled
using the lifting lever.
When it is necessary to use a hoist, the chain
or sling should be placed around the valve body
and bonnet in a manner that will insure that
the valve is in a vertical position to facilitate
installation.
INSTALLATION
Many valves are damaged when first placed
in service because of failure to clean the
connection properly when installed. Before
installation, flange faces or threaded
connections on both the valve inlet and
the vessel and/or line on which the valve is
mounted must be thoroughly cleaned of all dirt
and foreign material.
Because foreign materials that pass into and
through safety valves can damage the valve,
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 opens. The
system should be thoroughly cleaned before
the safety valve is installed.
The gaskets used must be dimensionally
correct for the specific flanges. The inside
diameters must fully clear the safety 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. For threaded valves, do not
apply a wrench to the valve body. Use the hex
flats provided on the inlet bushing.
Safety valves are intended to open and
close within a narrow pressure range. Valve
installations require accurate design both
as to inlet and discharge piping. Refer to
International, National and Industry Standards
for guidelines.
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VCOSI-02201-EN 18/01
SEMPELL SPRING OPERATED SAFETY VALVES
Operating and safety instructiOns
INLET PIPING
Connect this valve as direct and close as
possible to the vessel being protected.
The valve 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. Installing a
safety valve in other than this recommended
position will adversely affect its operation.
The valve should never be installed on a fitting
having a smaller inside diameter than the inlet
connection of the valve.
DISCHARGE PIPING
Discharge piping should be simple and direct.
A “broken” connection near the valve outlet
is preferred wherever possible. All discharge
piping should be run as direct as is practicable
to the point of final release for disposal. The
valve must discharge to a safe disposal area.
Discharge piping must be drained properly
to prevent the accumulation of liquids on the
downstream side of the safety valve.
The weight of the discharge piping should be
carried by a separate support and be properly
braced to withstand reactive thrust forces when
the valve relieves. The valve should also be
supported to withstand any swaying or system
vibrations.
If the valve is discharging into a pressurized
system be sure the valve is a “balanced”
design. Pressure on the discharge of an
“unbalanced” design will adversely affect the
valve performance and set pressure.
Fittings or pipe having a smaller inside
diameter than the valve outlet connections
must not be used.
The bonnets of balanced bellows safety valves
must always be vented to ensure proper
functioning of the valve and to provide a telltale
in the event of a bellows failure. Do not plug
these open vents. When the fluid is flammable,
toxic or corrosive, the bonnet vent should be
piped to a safe location.
SET PRESSURE VERIFICATION TESTING
Set pressure verification testing should be
performed in accordance with instructions
in the applicable Operation and Maintenance
Manual.
SAFETY PRECAUTIONS
• When the safety valve is under pressure never
place any part of your body near the outlet of
the valve.
• The valve outlet and any separate drains
should be piped or vented to a safe location.
• Always wear proper safety gear to protect
hands, head, eyes, ears, etc. anytime you are
near pressurized valves.
• Never attempt to remove the safety valve
from a system that is pressurized.
• Never make adjustments to or perform
maintenance on the safety valve while in
service unless the valve is isolated from the
system pressure. If not properly isolated
from the system pressure, the valve may
inadvertently open resulting in serious injury.
• Remove the safety valve prior to performing
any pressure testing of the system. It is
recommended that valves with welded inlets
be hydrostatic tested using hydrostatic test
plugs and caps supplied with the valves.
• The safety of lives and property often depends
on the proper operation of the safety valve.
The valve must be maintained according
to appropriate instructions and must be
periodically tested and reconditioned to
ensure correct function.
• For further information including adjustment,
maintenance, cleaning lapping and detail
illustrations, obtain the appropriate
Operation and Maintenance Manual from
the following table. These manuals may be
requested from the factory or are available
atEmerson.com/FinalControl
Operation and
Valve model
VSE 0 MA.270.01.xxxx
VSE 1, VSE 2, VSR 1, VSR 2 MA.271.01.xxxx
VSE 5, VSR 5 MA.273.01.xxxx
Series S MA.280.01.xxxx
Mini S MA.285.01.xxxx
Series SN SEMSB-0015
Series A SEMDR-0065
maintenance manual
Service technicians are available to assist with
your installation or other field problems. Call
your nearest Emerson representative.
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