Emerson Sempell series Installation And Maintenance Instructions Manual page 3

SEMPELL HIGH PRESSURE FORGED GLOBE VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
Installation instructions
Globe valves are normally installed in
horizontal pipe with vertical stem.
These valves can also be installed in vertical or
horizontal pipe with stem other than vertical,
but the maintenance is much more difficult.
Globe valves are usually installed on horizontal
pipe with the same flow direction of the arrow
stamped on the body.
For operating temperatures above 200 °C
(392 °F) a thermal insulation of the valve body
is recommended.
Handling and lifting of the valves during
installation MUST be performed following the
same criteria and instruction described in
previous points 'Handling requirements' and
'Storage and preservation' before installation.
WARNING
Before lifting or handling the valve or the valve/
actuator assembly, make sure you have no
limitation to do it. Check if there are some safety
messages attached to the lifting points of the
valve or to the actuator (red rigid label) and, if
any, find the proper document in the user manual
which describes how you can operate under safety
conditions.
A - Buttweld valves
1. Open the valve.
2. Position the valve and check for alignment
with the pipe, then proceed with welding,
in accordance with the applicable welding
procedure.
WARNING
Before welding, make sure the valve is completely
open.
B - Flanged valves
1. Position the valve between the two flanges
of the pipe and put the seal gasket between
valve flange and pipe flange. Ensure that it
is correctly positioned.
2. Assemble the valve to the pipe by means of
bolts which shall be tightened by using the
crossover method.
3. Progressively reach the requested torque.
WARNING
Verify that the direction of the flow of the line
corresponds to the arrow indicated on the valve
body. Valves without the arrow are bi-directional.
IMPORTANT
It is recommended to perform piping flushing
before installation of valve. If this is not possible,
the valves must be set with the plug in full open
position before starting with flushing.
Valve verification before start up
1. Tighten the packing just enough to prevent
stem leakage. Over-tightening will decrease
packing life and increase the operating
torque. The bolt torque figures for the
packing bolts can be calculated as indicated
in Table 1.
2. Check the operation of the valve by stroking
it to 'full open' and 'full close'.
3. Should the valve be equipped with electric
actuator, please refer to dedicated
paragraph (page 4) for actuator adjustment
instruction.
IMPORTANT
If piping system is pressurized with water for
testing, and in case the piping system has been
shut down after testing for a long time, the
following recommendations should be adopted.
a. Use corrosion inhibitor with water to
pressurize the piping system.
b. After testing, the piping system should be
depressurized and the test water completely
drained.
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