SEMPELL PRESSURE SEAL GATE VALVES - STYLE A
Cast Gate ValVes, wedGe & Parallel slide ConfiGuration, welded ends
Installation and maintenance instructions
Handling requirements
A - Packed valves
Crates: Lifting and handling of the packed
valves in crates will be carried out
by a fork lift truck, bymeans of the
appropriate fork hitches.
Cases: The lifting of packed valves in cases
should be carried out in the lifting
points and at the center of gravity
position which have been marked. The
transportation of all packed material
must be carried out safely and
following the local safety regulations.
B - Unpacked valves
1. The lifting and the handling of these valves
has to be carried out by using appropriate
means and at respecting the carrying limits.
VALVE STORAGE
Preparation and preservation for Shipment
All valves are properly packed in order
to protect the parts that are subject to
deterioration during transportation and storage
on site. In particular, the following precautions
should be taken:
1. The valves must be packed with the wedge
in the closed position.
2. The weld ends surface shall be protected
with suitable protective like Deoxaluminite.
The end shall be closed with plywood or
plastic disc fixed at the edge by strips.
3. All actuated valves must be carefully
securely palleted or crated, in order to
ensure that the parts of actuator (especially
pneumatic piping or accessories) do not
extend beyond the skid/crate.
4. The type of packing must be defined in the
customer’s order and shall be appropriate
to ensure safe transportation to final
destination and eventual conservation
before installation.
The handling must be carried out on pallets,
protecting the machined surfaces to avoid
any damage.
2. With valves of large dimensions, the sling
and the hooking of the load must be carried
out using the appropriate tools (brackets,
hook, fasteners, ropes) and load balancing
tools in order to prevent them from falling
or moving during the lifting and handling.
Emerson.com/FinalControl
VCIOM-04586-EN 18/01© 2017 Emerson. All Rights Reserved.
SEMPELL PRESSURE SEAL GATE VALVES - STYLE A
Cast Gate ValVes, wedGe & Parallel slide ConfiGuration, welded ends
VALVE SLINGING
FIGURE NO. 1
Storage and preservation before installation
In case the valves have to be stored before
installation, the storage has to be carried out
in a controlled way, and has to be performed in
accordance with the following criteria:
1. The valves have to be stocked in a closed,
clean and dry storage room.
2. The wedge must be in the closed position,
and the end faces must be protected with
plastic or wooden discs fixed with straps. If
possible, keep the original protection.
3. Periodical checks have to be carried out
in the storage area to verify that the above
mentioned conditions are maintained.
For actuated valves, in addition to the above,
please refer to the warnings in the manual of
the actuator.
NOTE
Storage in an open area for a limited period can be
considered only in case the valves have appropriate
packing (packed in cases lined with tarred paper, and
contents well protected with barrier sacks).
Do not place consignment packages directly on the
ground.
Do not expose consignment packages to the weather
or directly to the sun.
Check the packaging every two months.
CAUTION
For valve handling and/or lifting, the lifting
equipment (fasteners, hooks, etc.) must be sized
and selected while taking into account the valve
weight indicated in the packing list and/or delivery
note. Lifting and handling must be made only by
qualified personnel.
Do not use the lifting points located on the
actuator, if any, to lift the valve. These lifting points
are for the actuator only.
Caution must be taken during the handling to
avoid that this equipment passes over the workers
or over any other place where a possible fall
could cause damage. In any case, the local safety
regulations must be respected.
INSTALLATION
Preparation before installation
1. Carefully remove the valve from the
shipping package (box or pallet) avoiding any
damage to the valve or, in case of automated
valves, to the electric or pneumatic/
hydraulic actuator or instrumentation.
2. The valves are shipped with the ends
protected by caps and coated with a
thin layer of protective grease. Before
installation, remove the caps of the ends
and the protective grease by cleaning them
completely with a solvent liquid. Clean the
inside of the valve using an air line. Ensure
that there are no solid objects such as
pieces of wood, plastic or packing materials
within the valve or on the valve seat.
3. Confirm that the materials of construction
listed on the valve nameplates (service and
temperature) are appropriate for the service
intended and are as specified.
4. Define the preferred mounting orientation
with respect to the system pressure.
If any (see arrow on the body), identify
the upstream side (high pressure) and
downstream side (low pressure).
WARNING
Verify that the direction of the flow in the line
corresponds to the arrow indicated on the valve
body. Valves without the arrow are bi-directional.
See the actuator user manual for the actuator
preparation.
2
SEMPELL PRESSURE SEAL GATE VALVES - STYLE A
Cast Gate ValVes, wedGe & Parallel slide ConfiGuration, welded ends
IMPORTANT
After the valves installation and before the
90° max.
FIGURE NO. 2
INSTALLATION POSITIONS RECOMMENDED
WARNING
Before welding, check that valve is completely
opened.
Installation instructions
Gate 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 this may require special construction
depending on valve size, service condition,
material and type of operator.
For a correct operation, we recommend
that the valve shall be installed and oriented
following the indications of Fig. 2.
This can help minimize any problem associated
with solid particles present in the fluid that
otherwise could deposit in the lower part of the
body and be obstacle to the wedge complete
closure.
Install the valve with the wedges in closed
position unless otherwise stated. Thus, the
sealing surfaces will not be damaged during
installation.
Particular care should be taken with those
valves equipped with ‘fail-open’ actuators.
For operating temperatures above 200°C
(392°F) thermal insulation of the valve body is
recommended.
Handling and lifting of the valves during
installation MUST be performed following the
same criteria and instructions described in
previous points ‘Valve handling’ and ‘Storage
and Preservation before Installation’.
Buttweld valves
1. Open the valve.
2. Place the valve, check the alignment with
the pipe and weld in accordance with the
welding standard procedures as stated by
the Engineering Society.
line testing, it is recommended to perform an
accurate cleaning of the lines to eliminate dirt
and any foreign objects that could seriously
jeopardize the tightness between seat/disc and
the correct operation of the valve. It is therefore
recommended to leave the valve in the open
position.
Valve verification before start up
1. Tighten the packing just enough to prevent
stem leakage. Over-tightening will decrease
packing life and increase operating torque.
The bolt torque figures for the packing bolts
can be calculated as indicated in Table I.
In the case that leaking from the packing
occurs during the start up, proceed as
follows:
- Tighten the nuts to the indicated torque
(see table), operate the valve and re-tight
the nuts to the indicated torque.
- Repeat the operation until the leakage
stops.
2. Check the operation of the valve by stroking
it to ‘full open’ and ‘full close’.
3. In case of electric actuated valves,
see paragraph for instructions on the
adjustment of the actuator.
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.
Scheduled maintenance
1. Style A Series Gate Valves do not require
special care to work properly.
The following instructions will help provide a
satisfactory and long life service.
2. Make sure to perform periodic valve
verification as described in paragraph '
Adjustment of electric actuators'.
3. In case of actuated valves always follow the
specific instructions given by the actuator’s
manufacturer.
4. Never change the setting of torque and/or
limit switches which have been carefully set
during the final test at the manufacturing
plant.
3
Loading...