Emerson Sempell series User manual

www.valves.emerson.com VCIOM-01412-EN-15/05 © 2012 Emerson. All Rights Reserved
Cast pressure seal - Style A Swing check and tilting disc configuration
SEMPELL DEWRANCE PRESSURE SEAL CHECK VALVES
InstallatIon and MaIntenance InstructIons
SECTION 1 - VALVE STORAGE
1.1 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 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.
2. 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.
1.2 Handling Requirements
A - Packed Valves
Crates:
Lifting and handling of the packed valves in
crates will be carried out by a fork lift truck, by
means 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.
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.
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.
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.
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.
Valve slinging
FIGURE NO. 1
Swing Check and Tilting Disc Valves
1.3 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 disc 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.
Warning
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.
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.

⅜18 24.5
½37 50.0
⅝74 100.0
¾125 170.0
⅞207 280.0
1310 420.0
1⅛ 443 600.0
1¼ 627 850.0
1⅜ 811 1100.0
2
IMPORTANT
After the valves installation and before the 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.
Warning
Verify that the direction of the flow in the line
corresponds to the arrow indicated on the valve
body.
IMPORTANT
To ensure tightness of Pressure Seal gasket, pull
up bolts must be tightened when valve is under fully
hydrostatic test pressure.
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.
SEMPELL DEWRANCE PRESSURE SEAL CHECK VALVES
InstallatIon and MaIntenance InstructIons
SECTION 2 - INSTALLATION
2.1 Preparation before Installation
1. Carefully remove the valve from the
shipping package (box or pallet) avoiding any
damage to the valve.
2. 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. The
arrow on the body identifies the upstream
side (high pressure) and downstream side
(low pressure).
2.2 Installation Instructions
Check valves are normally installed in
horizontal pipe, but can also be installed in
vertical pipe with upward flow.
For a correct operation, Dewrance
recommends 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 disc complete
closure.
Unless otherwise recommended by Dewrance,
the valve should be installed with the disc in
the closed position, to ensure that the seat ring
in the disc is not damaged during installation.
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 “1.2 Handling Requirements”
and “1.3 Storage and Preservation before
Installation”.
Buttweld Valves
Position the valve and check the alignment
with the pipe, then proceed with welding,
in accordance with the applicable welding
procedure.
2.3 Valve Verification before Start Up
1. If the valve has been stored for a long time,
check the bolt torque for bolting (pos. 31) in
accordance with table I.
FIGURE NO. 2
Installation positions recommended
0 to 90°
Flow
25° max.°
25° max.°
TABLE I: BOLT TORQUE TO ENSURE
TIGHTNESS OF PRESSURE SEAL GASKET
Stud Torque ft.lbs. Torque Nm

3
42 311 6 31 32
43
5
Caution
The nuts (pos.31) need to be retightened after
valve first pressurization, as indicated in Table I.
SEMPELL DEWRANCE PRESSURE SEAL CHECK VALVES
InstallatIon and MaIntenance InstructIons
2.4 Operations Instructions
1. Style A Series Check 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 2.5.
2.5 Periodic Valve Verification during Service
A - Normal Check
1. Verify monthly that there is no leakage
from the body/bonnet area. If the leakage
has been detected from the body/bonnet
area, tighten the nuts (pos. 31) as indicated
in Table I. If the leakage does not stop,
follow the maintenance procedure for the
replacement of the body/bonnet gasket (3.2,
3.3).
B - Preventive Actions
1. Every 4 years disassemble the critical
service valves, verifying the sealing surfaces
and lap them again when necessary.
Substitute the bonnet gasket.
SECTION 3 - MAINTENANCE
The Style A Series Valves have been designed to
require minimum maintenance.
This manual describes on site repairs as:
- Body/Bonnet Gasket Replacement
All the other repairs should be performed by
Dewrance or Nominated Service Company.
3.1. Bonnet Gasket Replacement
Warning
Before starting any maintenance, depressurize,
drain and vent the line; check that the valves are
not in temperature.
Failure to do so may cause serious personal injury
and/or equipment damage.
Please refer to Figure no. 3.
1. Unscrew the nuts (pos.31).
2. Remove the retaining ring (pos.311).
3. Remove the segment rings, push them out
from the body groove by using the body
holes placed radially on the top of the body.
4. Lift up the bonnet (pos.6) and pressure seal
body gasket (pos.5).
5. Carefully clean all the gasket housing and
lubricate with suitable grease.
6. Replace the body gasket.
7. Reassemble all parts following backwards
the above mentioned steps.
FIG. NO. 3
SECTION 4 - VALVE REMOVAL
If the valve needs to be removed from the line
for some extraordinary reason, the user should
ensure the following:
1. The valve is depressurized, drained and
vent;
2. The pipe shall be cut as far away from the
valve as possible.
SECTION 5 - SPECIAL TOOLS
No special tool required for the Maintenance
Operation described in this Manual.

4
SEMPELL DEWRANCE PRESSURE SEAL CHECK VALVES
InstallatIon and MaIntenance InstructIons
TROUBLE SHOOTING GUIDE
Symptom Possible cause Solution
Body-Bonnet leaking 1. Gasket bolting loose (pos 31)
2. Gasket damaged
1. Tighten bolting (pos 31)
2. Replace gasket
Valve leaking 1. Valve not fully closed
2. Debris trapped in valve
3. Sealing surface damaged
1. Flush valve in order to close it
2. Cycle and flush (with valve open) to
remove debris
3. Recondition the sealing surface
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