Emerson Sempell S Series User manual

SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
Before installation these instructions must be fully read and understood
ATTENTION
This operating instruction does not specify the
extent of delivery. It is valid for several sizes,
designs, accessories and additional devices.
It contents generally exceeds the contractual
determined extent of delivery.
Type
Series S, types SO, SC, SB, SOH full-lift
safetyvalves
Orifice letter D - Z
Design
• Spring-loaded
• With DIN and ANSI connections
• According to API Standard 526
• According to AD A2, TRD 421
For the application of a pneumatic drive A160
see corresponding operating instruction
VCIOM-02239.
Observe design data on the nameplate!
VCIOM-02373-EN 16/07
1 DANGER AND WARNING INDICATIONS
The construction of the Sempell safety valves
of the series S corresponds to the standard
technology and the valid safety regulations.
Nevertheless, improper use or improper
installation can cause risks for the personnel
or can lead to restrictions in regard of the
operational safety. Therefore, the Sempell
GmbH recommends the operator of the safety
valves to take appropriate measures and make
sure that the present operating instructions
are read and understood by the assigned
personnel.
APPLICATION LIMITS
It is only allowed to use the valves according to the
details of this operating instruction and according
to the parameters and application cases agreed
in the delivery contract (see nameplate). The
application of the valve has to take place adequate
to the medium tolerances of the used materials.
WARNINGS FOR THE OPERATING AND
MAINTENANCE PERSONNEL
Before commissioning and maintenance works
familiarise yourself with the legal accident
prevention regulations, the local safety
instructions and this operating instruction and
observe them.
Use the safety valve and its individual parts and
accessories only for the purpose intended byus.
MA.280.01.1215 E
Emerson.com/FinalControl © 2017 Emerson. All rights reserved.

2
Plant downtimes
NOTICE
For longer system downtimes, a downtime
preservation must be carried out.
If systems are set out of operation for a shorter
or longer time, procedures (VGB - R 116)
depending on downtime duration and frequency
should be applied to preserve the system.
Limitation of liability
All specifications and notices in this instruction
manual were drawn up with consideration of
the applicable standards and regulations, the
status of technology and our longstanding
findings and experiences.
The manufacturer does not assume liability for
damages in the following cases:
• Non-adherence to this instruction manual
• Usage deviating from the intended use
• Employment of untrained personnel
• Independent reconstruction
• Technical modifications
• Usage of unauthorized spare parts
• Use of unauthorized operating media
• Improper maintenance and setting of
thevalve
2 DESCRIPTION
Spring-loaded safety valves are direct acting
safety valves with which pressure vessels
are protected against inadmissible excess
pressure.
A cylindrical compression spring creates the
closing force on the valve disc against the
opening pressure of the medium below the
valve disc. Under normal operating conditions
the valve seat is kept tight.
By changing the spring compression the
set pressure can be changed. When the set
pressure is surpassed, the pressure of the
medium prevails and the safety valve opens.
In case of full-lift characteristic the safety valve
opens abruptly over the full lift and discharges
the whole mass flow which is necessary to
prevent further increase of the pressure.
The safety valve closes again after a defined
pressure reduction.
Please observe the planning manual for the
precise design of the safety valves.
For the application of this operating instruction
please take the exact type name (e.g. SC, SB)
from the nameplate of your valve.
Please observe the following points besides
the notes given in the text
• Danger of burning at safety valves and with
their connected lines while operating under
increased temperature.
• Disassembly of the safety valve only in case of
pressureless plant or after cooling down.
• Protection against risks caused by
evaporation also in case of pressureless
system; for information please contact the
safety inspector concerned.
• After assembly check all sealing points in
regard of tightness.
• In case of adjustment make changes at
pressure screw and adjusting ring only with
sunstantially reduced pressure to avoid
unintended response.
• Carry ear protection during adjustment,
ifnecessary.
• Danger of burning by discharge of small
amounts of possibly hot medium in case
of safety valves with open spring bonnet
(typeSO).
• Danger of injury while discharging in case of
disconnected discharge line.
• Extreme vibrations can lead to inadmissible
increase of operating pressure with the
possibly destruction of the safety valve or to
the destruction of the balanced bellows with
unintentional escape of medium.
• In case the valve is provided with a steam
jacket or a steam flushing device, the
corresponding design must be considered
while connecting.
• Temporary or permanent connection of
devices not authorized by us
The actual scope of delivery may deviate from
the explanations and figures described here
regarding special versions, the utilization
of additional order options or due to newest
technical modifications.
The obligations, General Business Terms and
Conditions and the delivery conditions of the
manufacturer agreed upon in the delivery
contract are applicable, along with the legal
regulations valid at the time of contract
conclusion.
Use within areas exposed to danger of
explosion:
The safety valves underwent a hazard analysis
according to code 94/9/EC with the following
result:
• The safety valves do not have a potential
ignition source. ATEX 94/9/EC is not
applicable to these valves.
• The valves safety may be used in the EX area
• Electrical / pneumatically accessories have to
undergo a separate assessment of conformity
according to ATEX.
• The surface temperature does not depend
from the valve itself but from the operational
conditions. Observe while installing.
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS

3
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
3 OPERATION
3.1 Warning indications for the operation
Observe safety regulations!
ATTENTION
Unstable behaviour of safety valves such as
chattering or vibrating can destroy the valve seat,
the safety valve or the line and thus causing the
failure of the safety function or the shutdown of
the plant.
Therefore, observe regulations and empirical
notes regarding design and dimensioning, fitting
and installation.
• Design and dimensioning: do not use larger
safety valves than necessary! In case of back
pressure use safety valves with bellows.
• Fitting and installation: design supply line
as short as possible. Use as few bends as
possible.
• Keep supply line free from vibrations. Absorb
or avoid pressure surges and waves, e. g.
caused by pumps or other valves.
• Drain the discharge line and the valve body at
their lowest point. Condensate can impair the
function of the safety valve.
• Protect lines and valve against freezing.
3.2 Storage rules
To preclude damages during loading and
unloading move the valves cautiously.
At delivery the outsides of all ferritic parts of
the safety valve are supplied with a coat of paint
except the welding edges and gasket surfaces.
The insides are protected by a watery corrosion
preservative that has a long-term effect
because of the film formative active agents.
All connection inlets are closed by
corresponding caps.
In this state the safety valve can be stored in
closed, dust-free and dry rooms lying on a
pallet without difficulties. Time of storage about
six months.
Storage of more than six months asks for a
disassembly and a visual check of the inner
parts of the safety valves. A weather-protected
outside storage is not allowed.
For spare parts out of elastic material
(O-rings, scraper rings, rod and piston
gaskets) additionally apply:
Temperature
The temperature of the storage shall be
between 0°C and 25°C since otherwise a
hardening of the material and so a shortening
of durability will follow. Shield heating elements
and lines in heated storeroom so that no direct
heat irradiation arises. The distance between
the heat source and the stocks has to be 1 m
at least.
Moisture
To prevent the formation of condensate, avoid
moist storerooms. A relative humidity of
below65% is at best.
Lighting
The products of elastic materials are to protect
from direct sun light and from strong artificial
light with a high ultraviolet part. Therefore
supply the windows of the storerooms with a
red or orange (in no case blue) paint.
3.3 Transport instructions
The welding ends or flanges are protected by
plastic caps.
The coating is a primer which is designed to
provide protection against corrosion during
transport and storage. Do not damage the layer
of coating.
Transport is only permitted on original
manufacturer’s transport items (e.g. pallets).
WARNING
Material damage due to improper transport!
If not transported properly, transport items can
fall or crash. This can result in significant material
and personal damage.
Ozone
Protect products of elastic materials from
ozone (formation of cracks and embrittlement).
The storeroom may not contain ozone
generating systems (fluorescing sources
of light, mercury vapour lamps, electric
motors,etc.).
Oxygen
Protect products out of elastic materials from
draught by storage in airtight boxes. Oxygen
causes cracking and embrittlement.
If these requirements are guaranteed for
products out of elastic materials the storage
time is about 5 years.
For spare parts out of steel
Store the parts in closed, dust-free and dry
rooms so that damages do not occur.
Especially the following protection measures
have to take place:
Disc (3): wax coat of the gasket, net coat
Disc holder (7): protection by net coat

4
X
Y
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
3.4 Installation instructions
NOTE
Clean lines before installing safety valves as otherwise
the valve seats can be damaged by foreign particles
when discharging!
• Remove plastic caps protection just before
installation.
• Check plant identification and details on the
nameplate.
• Vertical installation position, inlet from
below. Prevent bracing of the valve body by
connected line.
PLEASE NOTE
Stresses at the valve body may lead to leaking at
the valve seat!
The installation point must be easily accessible
so that necessary maintenance works can be
carried out. The free space above the valve
should at least correspond to the dimensionX
(see table). In case of major valves (over 4”)
additional space should be provided for lifting
gears, at least 500 mm.
In case of hot medium, e. g. steam, insulate
supply line and valve body. The spring bonnet
must remain free. Without insulation the
produced condensate may cause malfunction.
3.5 Connection of lines
3.5.1 Inlet line
If possible arrange safety valve directly at the
nozzle of the tank to be protected. Otherwise
lay inlet line between tapping point and safety
valve as short and as low in resistance as
possible.
In no case the inlet line diameter shall be
smaller than the inlet nominal size of the
safetyvalve.
The pressure loss in the inlet line must not
exceed 3% of the set pressure at the highest
possible discharge quantity.
Check inlet line in regard of pressure vibrations
according to FBR 153 as far as possible.
ATTENTION
A pressure loss higher than the closing pressure
difference may lead to an unstable, uncontrollable
behaviour of the safety valve; chattering or
vibrating may destroy the valve seat, the safety
valve or the line and thus lead to the failure of the
safety function or to the shutdown of the plant!
In order to facilitate the drainage of
condensate, the inlet line must be mounted to
the valve with at least a 15-degree ascending
slope position.
ATTENTION
Condensate at the inlet of the safety valve
changes the functional behaviour and may lead
to an inadmissible pressure increase. Danger of
explosion!
In case of liquids with temperatures higher than
the ambient temperature, the inlet line must
be assembled with slope to the safety valve, or
designed as a siphon-type bend in front of the
safety valve. Thereby, a heat transmission to
the safety valve is avoided which could impair
the tightness at the valve seat.
Orifice letter Overhead dimension X (mm)
D - J 300
K - R 700
T900
T1 1000
U - Z 1200
• Proceed with caution and observe the
information on the packaging when unloading
the transport items on delivery and when
transporting internally.
• Protect the valve against bumps and blows
during transport.
• Use the attachment points provided.
• Only remove packaging just before assembly.
To preclude damages during transport move
valves by hand or with suitable lifting gears.
It is not permitted in any case to lift or transport
the valve by means of the lifting lever.
Actuator elements are not suitable as
attachment points. If the use of a lifting device
is necessary, it is preferable to wind a round
sling around the valve body and upper part in
order to transport the valve in a vertical position
to its destination.
Y = Upper edge insulation

5
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
3.6 Pressure test of installation
The response of the safety valve must be
prevented.
Either flange off the safety valve and close
the supply line with a blind flange or block
the valve. In case of welded-in safety valve a
pressure test insert can be used.
ADMISSIBLE BACK PRESSURES
Valve type Medium Maximum back pressure
SO.. Gases/vapours Superimposed back pressure constant 0% p
Superimposed back pressure variable 0% p
Built-up back pressure 15% p
SC.. Gases/vapours Superimposed back pressure constant 50% p
Superimposed back pressure variable 0% p
Built-up back pressure 15% p
Liquid Superimposed back pressure constant 80% p
Superimposed back pressure variable 0% p
Built-up back pressure 15% p
SB.. Gases/vapours Superimposed back pressure constant 50% p
Superimposed back pressure variable 50% p
Built-up back pressure 50% p
Liquid Superimposed back pressure constant 50% p
Superimposed back pressure variable 50% p
Built-up back pressure 50% p
ATTENTION
Higher back pressures may lead to an unstable,
uncontrollable behaviour of the safety valve;
chattering or vibrating may destroy the valve seat,
the safety valve or the line and thus lead to failure
of the safety function or to shutdown of the plant!
ATTENTION
An icy, frozen or clogged exhaust line leads to the
failure of the safety function! Dangerof explosion
in case of excess-pressure!
ATTENTION
In case of a blocked safety valve the test pressure
can amount up to 1.5 × of the set pressure without
consultation with Sempell.
CAUTION
In case of several safety valves with one common
exhaust line, take special safety precautions for
disassembling of only one safety valve to exclude
danger in case of unintended discharge of other
safety valves!
Recommendation! Sound isolate exhaust line
and/or provide the same with silencer; in doing
so, regard allowable back pressure!
At the deepest point the exhaust line must be
equipped with a drain large enough to enable
the discharge of minor leaks, e. g. in case of
untight valve seat. Particularly in the open air
exhaust line, valve body and drain must be
protected against icing and freezing, e.g. by
(electrical) trace heating; merely insulating is
not sufficient!
3.5.2 Exhaust line
In no case the exhaust line diameter must be
smaller than the outlet nominal size of the
safety valve.
For valves type SO and SC back pressures
up to 15% of the set pressure and for valves
with bellows of type SB and valves with
compensating piston (SN 144) back pressures
up to 50% are acceptable unless there are
other restrictions such as mechanical loading
capacity of the bellows or insufficient strength
of the body connection flange.

6
20
21
11
22
35 U - Z 21.1
20
20
21
11
22
35
U - Z 21.1
20
20
21
11
22
35
U - Z 21.1
20
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
For orifice D to T1 loosen the 4 cap bolts
(21) and for orifice U to Z the four hexagonal
screws (21.1). Remove the cap top (20) and put
it reversed on place again. Now it rests on the
spindle end (11) and will be retightened again.
Now the valve is blocked. The signal pin (35)
or the blocking screw fixed in the cap top (20)
points upward and so shows the blocked state.
ATTENTION
After the pressure test restore and control the
ready-to-operate state.
ATTENTION
In case of safety valves, type SO.. (with open valve
bonnet) some leaking medium may pass out
at the bonnet (12) when discharging. Danger of
scalding by steam!
ATTENTION
Perform adjusting works only at lowered
pressure. At operating pressure, unscheduled
response of the safety valve can occur when the
adjusting screw (17). Small amounts of leakages
can escape at the spindle guide of the adjusting
screw (17).
3.7 Commissioning
The blocking screw must be removed for all
valves delivered in the blocked position.
The safety valve is ready for operation.
Theset pressure is adjusted and lead sealed
to prevent unauthorized adjustment. Higher
medium temperatures can lower the response
point by about 1% per 100 °C and require a
readjustment under operating conditions.
Please take standard values from the table in
section 3.9, “Adjustment of the set pressure”.
3.9 Adjusting the set pressure
ATTENTION
A change of the lead sealed spring adjustment
must only take place in the presence of the
competent inspector.
3.8 Operational test, discharge test
The function and reliability of the safety
valves, type S, have been proved by a type test
conducted by the US National Board of Boiler
and Pressure Vessels Inspectors as well as
by a component test according to VdTÜV 966.
Therefore, an operational test in the plant
need not be conducted and is restricted to
exceptions, normally at the time of revision of
steam boiler safety valves.
Before discharge test, apply ear plugs.
Slowly increase the operating pressure in the
plant until the safety valve is fully opened.
Lower the operating pressure until the safety
valve closes.
In case of several discharge tests with hot
steam allow intermediate cooling down of the
safety valve as, caused by the heating of the
spring, a slight decrease of the set pressure is
possible.
The adjustment of the set pressure takes place
on the test stand. It shall be adjusted in the
plant only if there is no other possibility.
In any case the adjustment in the plant should
be applied with the pneumatic measuring
device A143 as by means of this device the set
pressure can be adjusted without increasing
the operating pressure (see Technische Schrift
KW 271: Sesi-Test, “Mobile Device A 143 for the
Test of Spring-loaded Safety Valves”.)
Apply ear plugs.
Remove the lead seal; take off cap (19, 20, 21).
Loosen adjusting screw nut (18). For work at
the adjusting screw (17) secure spindle (11)
(or(7.2) (at orifice U-Z), SOH) against turning
for otherwise the valve seat (2.1) or the bellows
(8) can be damaged.
Tighten adjusting screw (17) (turn right) =
setpressure higher
Loosen adjusting screw (17) (turn left) =
setpressure lower.
Secure adjusting screw (17) with adjusting
screw nut (18). Mount cap (19 ... 21) and
leadseal.
Standard values for the change of the set
pressure in % for a quarter turn of the adjusting
screw (17):
Orifice letter Change
D/E 10
F 7
G-K 4
L-N 3
P-R 1.5
T 1
T1 1
U-Z 0.5

7
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
3.10 FUNCTIONAL DIFFERENCES
Gases / Vapours:
Opening excess pressure +5% p or 0.1 bar for p smaller than 3 bar
Closing excess pressure -10% p or 0.3 bar for p smaller than 3 bar
By means of the adjusting ring (5) a closing pressure difference of -7% p
or0.2 bar can be reached for p smaller than 2 bar.
Liquids:
Opening excess pressure +10% p
Closing excess pressure -20% p or 0.6 bar for p smaller than 3 bar
Change of the functional differences
(onlyvalves with adjusting ring):
ATTENTION
Remove adjusting ring pin (6) only at reduced
pressure.
Push a screwdriver through the hole and adjust
the adjusting ring (5) groove by groove. One
notch pitch corresponds to about 0.2 mm of
change in height. The adjusting ring (5) has a
right-hand thread.
Turn adjusting ring (5) up = closing pressure
difference increases.
After the adjustment screw in adjusting ring
pin(6) again.
3.11 TROUBLE SHOOTING
Malfunction Causes Remedies
Safety valve opens at
different pressures.
1. Condensate in the supply line. 1. Improve insulation of line. Observe drain and slope.
2. Pressure change by superimposed vibration. 2. Suppress vibrations at the safety valve.
Safety valve opens and
closes in rapid succession.
1. Pressure loss in the supply line is greater than the closing
pressure difference.
1. Increase closing pressure difference. Otherwise reduce flow resistance
of the supply line: expand, shorten or remove area reductions.
Fast remedy: reduce lift (as far as allowed), thus reduce discharge.
2. Discharge quantity is too small because the subsequent
flow is too small.
2. Install smaller safety valve.
3. Admissible back pressure is exceeded in the exhaust line. 3. Decrease flow resistance of the exhaust line:
e.g. by expanding or shortening the line.
4. Dynamic pressure drop in the supply line,
especially in case of liquids.
4. Provide safety valve with a vibration damper.
Closing pressure
differences are toogreat.
1. Saturated steam with high moisture. 1. Install spring with a higher spring rate.
2. Adjusting ring (5) is set incorrectly. 2. See section 3.10
Safety valve remains open
after discharge test.
1. Foreign bodies between body seat and disc (3). 1. Open valve again by pressure increase or A 143. In case of valves with
lifting lever, lift and release it. Exhaust surge can blow off foreign
bodies. Otherwise disassemble valve.
Safety valve does not close
tightly.
1. Valve seat (2.1) damaged. 1
. Disassemble valve. Rework valve seat (2.1), if necessary replace disc (3).
2. Difference between operating and set pressure is too small. 2. Enlarge difference (section 3.9).
3. Forming of the valve body caused by too great line forces. 3. Lay line elastically.
4. In case of liquids with high temperatures,
no slope in the line to the safety valve. 4. Assemble supply line with slope to the safety valve or as a siphon.

8
d2
d1
d0
h2
h1
d2
d1
d0
h2
h1
d0 H11 10.5 14.0 14.0 17.5 22.5 28.0 36.0 43.0 53.0 60.0 66.0
d1 0,1 14.5 14.5 14.5 18.2 23.5 29.0 37.5 44.8 55.2 62.5 68.5
d2 0,1 15.4 15.4 15.4 19.4 24.8 30.8 39.5 47.0 57.5 65.0 71.5
h1 *0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.5 0.5 0.5 0.5
h2 ** 0.4 0.4 0.4 0.6 0.9 1.1 1.6 1.7 2.2 2.5 2.8
d0 H11 79.0 104.0 125.0 160.0 185,9 206.0 230.0 270.0 323.0 376.0 438.0
d1 0,1 82.2 108.2 130.0 166.5 192,4 214.2 239.2 280.8 335.9 391.0 465.5
d2 0,1 85.0 111.0 133.0 169.5 196,0 217.2 242.2 283.8 338.9 394.0 458.5
h1 *0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
h2 ** 3.5 4.9 5.8 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
5 DISASSEMBLY
5.1 Danger and warning indications
Take work order and wait until the installation
is switched free.
ATTENTION
Check if the valve is pressureless and
cooled down.
CAUTION
Residual fluid may escape when opening and
disassembling the valve.
4 INSPECTION AND MAINTENANCE WORKS
Determine inspection intervals in dependence
on response frequency and operating
conditions. Keep certificates about performed
works at the safety valves.
During tour
• Check valve in regard of tightness.
Therefore observe the following indications:
Whistling noises, medium emerging at the
bonnet (12), medium at the drain nozzle or in
the exhaust line.
During each inspection
• Check all gaskets. Replace them if leaky.
• Control seat faces.
• Recondition valve seat (2.1) and disc (3) with
fine lapping paste; if necessary, replace
disc(3) (section 7).
• Smooth disc holder (7) in the guide areas
(without material abrading machining).
• Check bellows (8) of valves type SB.
ATTENTION
Do not treat valve seats, metallic sealing faces
and the guidings at the disc holder (7) and
guide(10).
At longer intervals, e. g. every 3 years
• Completely dismount safety valve
(section5.5).
• Clean valve parts.
• Recondition valve seat (2.1) and disc (3) with
fine lapping paste; if necessary, replace
disc(3). In case of rework observe functionally
important dimensions at the valve seat
(seetable).
FUNCTIONALLY IMPORTANT DIMENSIONS AT THE VALVE SEAT
Orifice letter
Dim. in mm D(API) D(DIN) E F G H J K L M N
Orifice letter
Dim. in mm P Q R T T1 U V W X Y Z
* Replace nozzle (2) if h1 is smaller than the value
inthe table.
** Replace disc (3) if h2 is smaller than the value
inthe table.
• Replace spring (15) in case of corrosion or
temperature damage and adjust set pressure
again (section 3.9).
• Lubricate bearing (33) and adjusting screw
(17).
• Treat fits, gaskets and thread with a lubricant
for assembly.

9
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
5.3 Tools
• Torque wrench 17 - 55
• Fixed spanner 16 - 95
• Socket wrench 13 - 30
• Pin spanners in different sizes
• Safety ring pliers for outer rings
• Flatnose pliers, side cutting pliers
• Seal wire, lead seal, lead-sealing pliers
• Screwdriver for slotted-head screws long 5,5
• Screwdriver for fillister socket head
screws5- 14
• Hammer, punch
• Vernier calliper, depth gauge
• Lapping wheel according to valve seat
• Screw bolt M5 to M10
• Mark pen
• 2 ring screws M10 and M12
5.4 Operating materials
5.4.1 Lubricating the removable valve components
To lubricate the removable or detachable
valve components during assembly, use the
greases specified in Table A. Removable or
detachable valve components are all screw
connections, especially pressure-retaining
screw connections, and other components
within the distribution of forces. All removable
or detachable valve components are lubricated
with the same grease if they are lubricated in
the assembly process.
The operating temperature of the valve is
definitive for selecting the grease to be applied
for the removable valve components (cf. Table A).
5.5 Removing the valve bonnet
If only the seat shall be lapped, the complete
valve bonnet with compressed spring can be
removed.
Removal of valve bonnet with mounted
pneumatic drive A 160 see operating instruction
SEMSH-0067.
Remove lead seal. Take off cap (19, 20, 21).
Remove dowel (40) and turn spindle nut (22)
securely by hand (without tool!) against the
adjusting screw (17). In doing so, the spring
(15) becomes locked. Measure distance from
upper edge spindle (11) (or (7.2) (at orifice T1-Z),
SOH) to upper edge adjusting screw (17) and
registerit. Loosen bonnet nuts (14) and lift off
valve bonnet with locked spring (15).
5.2 Disassembling indications
Observe disassembling sequence to preserve
the valve set pressure.
ATTENTION
Loosen bonnet nuts (14) only if the spring (15)
is locked or released as otherwise the bonnet
studs(13) cannot absorb the compression way of
the spring (15).
For working at nuts (18, 22) or adjusting
screw (17), secure the spindle (11) (or (7.2)
(atorificeT1-Z), SOH) against rotating as
otherwise the valve seat (2.1) or the bellows (8)
can be damaged.
ATTENTION
The dismounted valve bonnet must not be
disassembled further in any case.
TABLE A - Greases for lubricating the removable valve components
Design temperature of the valve TBGrease
TB< 400°C Molykote®BR 2 Plus[1]
400°C ≤ TB< 700°C Molykote®P 37[1]
1. Before applying the grease, ensure that the surfaces are metallically blank (free of oil, grease, etc.)
and free of dirt particles.
The greases specified in Table A are manufactured and/or supplied by the following
manufacturers and/or suppliers:
Molykote®BR 2 Plus - Dow Corning GmbH Wiesbaden, Rheingaustr. 34, 65201 Wiesbaden
Molykote®P 37 - Dow Corning GmbH Wiesbaden, Rheingaustr. 34, 65201 Wiesbaden
5.4.2 Lapping abrasives
It is necessary to use special lapping abrasives
that contain finely distributed hardened
particles for lapping seat surfaces on body and
disk seats. The lapping abrasive specified in
Table B is recommended by Sempell
5.4.3 Further operating materials
Further required operating materials and
their usage are specified in Table C and are
manufactured and/or supplied by the following
manufacturers and/or suppliers
TABLE B - Lapping abrasives, suitable for the finishing of valve seats
Lapping abrasive Manufacturer / Supplier
TETRABOR®Boron carbide (F 100 - F 1200) ESK Ceramics GmbH & Co. KG Max - Schaidhauf-Str. 35,
87437 Kempten - Germany
TABLE C - Further operating materials
Usage Type Manufacturer / Supplier
Degreasing agent Isopropylalkohol (2-Propanol)
Assembly lubricant (colloidal graphite)
for parts in contact with the medium DAG®156 Acheson Industries, Dornstadt
ATTENTION
For oxygen application all parts in contact with
the medium must be free from oil and grease.
Danger of explosion.

10
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
5.7 Disassembly and installation of disc
Use lifting gears
for big valves
6 ASSEMBLY
6.1 Mounting of the valve bonnet
Assemble valve bonnet again. Screw the bonnet
nuts (14) onto the bonnet studs (13) and tighten
them by tightening torques according to table.
Loosen spindle nut (22). Check recorded
measure from upper edge spindle (11) (or (7.2)
(at orifice T1-Z), SOH) to upper edge adjusting
screw (17).
In case of differences adjust adjusting screw
(17). In doing so, the set pressure remains
the same. Check adjusting screw (17) with
adjusting screw nut (18). Secure spindle nut
(22) with dowel (40). Put on cap parts (19) and
(20) and tightly connect them with the bonnet
(12) by means of cap bolts (21).
6.2 Assembling of the dismantled safety valve
At valves with screwed nozzle
Screw in nozzle (2) with new gasket (23) into the
body (1) and tighten up to the metallic stop.
At valves with adjusting ring
Turn adjusting ring (5) on the nozzle (2). Adjust
it to the height measured during disassembly
and secure it within the marked groove by
means of the adjusting ring pin (6) turned into
the body (1).
NOTE
If this information is no longer available, the following
adjustment is recommended at the assembled valve.
Turn adjusting ring (5) to the disc holder (7) up to
the stop. Shift adjusting ring (5) downwards by the
following numbers of notches:
SKB D/E F G H J K L M N P Q R T T1 U V W X Y Z
Number of notches 6 8 10 12 15 18 23 26 28 23 30 35 34 72 81 60 70 84 98 114
5.6 Dismantling of the safety valve
Removal or disassembly of the possibly
mounted pneumatic drive A 160 see operating
instruction SEMSH-0067.
Remove lead seal. Take off cap (19, 20, 21).
Remove dowel (40) and spindle nut (22).
Measure distance from upper edge spindle (11)
(or (7.2) (at orifice T1-Z), SOH) to upper edge
adjusting screw (17) and register it. Loosen
adjusting screw nut (18) and release the spring
(15) by means of an adjusting screw (17).
Loosen bonnet nuts (14) and lift off bonnet
(12). For valves from size ‘T’ equipped with a
tightening nut (46) completely release spring
(15) by turning up tightening nut (46).
For orifice D - T
Remove retainer (31) or lower bearing plate (32)
which protects the pin (30) against being lost.
Press out pin (30) and remove spindle (11) with
spring (15) and accessory.
For orifice T1 - Z, SOH
Remove spring (15), spring plate (16) and
accessory from spindle (7.2).
By means of lifting gears draw spindle (7.2)
upwards against the stroke stop and with
complete internal parts carefully draw out
vertically upwards.
ATTENTION
Disc (3) must not fall out of disc holder (7.1) in any
case. Danger of damage! Possibly secure disc (3)
by means of adhesive tape against falling out.
If required, further dismantle spindle assembly.
For T1-Z and SOH, the spindle assembly can
not be further dismantled.
Dismount gaskets (24), guide (10) and, if
available, intermediate flange. Remove disc
holder (7.1) and disc (3).
ATTENTION
At valves with adjusting ring mark the locked
groove at adjusting ring (5). Measure and record
the distance between upper edge adjusting
ring(5) and valve seat (2.1).
Unscrew adjusting ring pin (6) and
adjustingring (5).
Dismantle nozzle (2) only if required.
Dismount cap (19, 20, 21) with lifting lever only
if required.

11
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
Insert disc (3) with disc retainer (4) into the disc
holder (7) (see section 5.6). Put the assembly
on the nozzle (2) into the body (1). Move guide
(10) on the disc holder (7) and center it in the
body (1). Take care that new gaskets (24) will be
inserted.
Only at orifice D -T
Put spindle (11) on the disc holder (7) and
connect both parts with the pin (30). Secure pin
(30) with retainer (31) or lower bearing plate
(32). In doing so, take care that the retainer (31)
is fixed in the groove.
Only at SOH
Mount spindle assembly. Secure allen bolts
(7.3, 10.4) by bordering or secure hexagonal
nuts (10.5) by locking plate (10.6). Carefully
insert spindle assembly (spindle and cover
(10.1)) vertically upwards into the body (1)
until the cover (10.1) rests into the pertaining
centring of the body (1). Slowly lower spindle
until the disc (3) rests on the body seat.
Mount washer (16), spring (15), washer (16),
lower bearing plate (32) and bearing (33) on
the spindle (11) (or (7.2) (at orifice T1-Z), SOH).
Place bonnet (12) into position. In doing so,
insert spindle (11) (or (7.2) (at orifice T1 - Z),
SOH) into the adjusting screw (17). Fix bonnet
(12) by means of bonnet studs (13) and
bonnet nuts (14) by the tightening torques
MAaccording to table. Prestress spring (15)
with adjusting screw (17) to the dimension
measured before disassembly. Therefore
secure spindle (11) (or (7.2) (at orifice T1 - Z),
SOH) at dual-cornered shaft against torsion,
as otherwise valve seat (2.1) or bellows (8) can
be damaged. Fix spindle nut (22) with dowel
(40) at the spindle end. In case of orifice D-S
put on cap (19) and cap top (20) or in case of
orifice T - Z cap (19) with new gaskets (25) and
attach them on the bonnet (12) by means of cap
bolts(21).
Only at orifice K - T
In case of a closed bonnet do not forget the
gaskets (43) below the cap bolts (21).
Tightening torques MA[Nm] of bonnet nuts (14)
Nut material M10 M12 M16 M20 M30 M36
Ferritic 30 40 90 180 500 900
Austenitic 20 30 80 170 440 780
After assembly check set pressure.
Forsome valves of the size ‘T’ to ‘Z’ the spring
(15) must be precompressed before assembling
the bonnet (12). Therefore screw the tightening
nut (46) downwards up to the step of the spindle
(11) (or (7.2) (at orifice T1-Z), SOH).

12
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
7 METHODS TO PRODUCE SUPERFINISHED
SEALING SURFACES
ATTENTION
Lapping is a precision operation and must
be carried out by trained personnel. Various
operating areas ask for various operating
methods.
8 SPARE PARTS
• Disc (3)
• Disc holder (7)
• Bellows (8)
• Guide (10)
• Gaskets (23 - 26)
• Piston ring, slide ring (38)
• Gaskets (43) (47)
Please specify valve type and job no.
(seenameplate) in your order.
7.1 Lapping area production
7.1.1 Disc (3)
Parts with flat seats are normally machine
lapped.
Procedure
Allow boron carbide lapping emulsion
(amixture of grade 800 lapping powder and
lapping oil) to drip onto the constantly rotating
lapping machine wheel. Load the items to
be lapped into a suitable locator that is set
eccentrically to the table.
The lapping operation takes 15 to 20 minutes
depending on the quality of the prepared
sealing surface. Afterwards the parts will be
polished. In case of parts made of material
1.4980 the parts will additionally polished on
a tin plate with a diamond suspension; grain
size 2 - 3. A sight control and a test with an
interference glass follow to check whether the
surface is plane and not convex or concave.
7.1.2 Valve seat (2.1)
The preferred method is hand operated
machine lapping in case the valve seat is fixed
in the body (screwed in, welded in or in another
connection). Thereby it is important that the
required force is constantly and steadily
transferred through a spring.
Procedure
Grinding and/or lapping foils of different grain
sizes are pasted onto a plain carrier wheel of
the machine. The prepared seating areas with
3.2 Ra roughness are alternately lapped with
grain sizes of 200-600-1000. After lapping with
200 grain size, there should be no visible tool
marks. The change takes place at intervals
of about 1 minute. Lapping is carried out with
oscillating movements. Finally the seating area
is cleaned and visually inspected.
7.2 Lapping area site
As a rule, there is no lapping machine available
so only a manual method or the method
described in section 7.1.2 can be used.
7.2.1 Disc (3)
Depending upon the size, lap the parts on glass
plates or discs or rings made of grey cast iron.
Lapping abrasive: Tetra Bor lapping paste
(grade 120 to 1200).
Procedure
Up to a size of about 200 mm diameters lap
the parts on the plates. In case of greater
diameters, use the part to be lapped as a pad
and move the discs or rings. Thinly distribute
the lapping abrasive on one side and up a
grain size > 400 additionally sprinkle it with oil
drops. Oscillatingly move the valve part or the
lapping wheel with constant hand pressure.
This operation takes several minutes. Remove
the paste with a cold cleaning and repeat the
procedure using progressively finer lapping
paste. Finally a sight control follows.
Up to a size of about 200 mm diameter lap the
discs with a mobile manual lapping machine
according to section 7.1.2.
7.2.2 Valve seat (2.1)
Procedure see section 7.1.2.
ATTENTION
Check body seats regularly to verify that the seat
surfaces are still rectangular to the body center.
Ifthis is not the case, restore squareness by using
a flat grinding machine.
9 DECLARATION TO EC-DIRECTIVE
The declaration of conformity can be found in
the documentation.

13
2.1
21
31
41, 42
18
14
7
4
34
1
27
35
22
40
20
15
32
33
17
19
25
16
12
10
24
30
13
16
25
2
27.1
11
3
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
PARTS LIST
Part Name
1Body
2Nozzle
2.1 Valve seat
3Disc •
4Disc retainer
5Adjusting ring
6Adjusting ring pin
7Disc holder •
7.1 Disc holder
7.2 Spindle
7.3 Allan bolt
7.4 Straight pin
8Bellows •
9Bellows cover
10 Guide •
10.1 Cover
10.2 Guide bush
10.3 Stroke stop
10.4 Stud, Allan bolt
10.5 Hexagonal nut
10.6 Locking plate
10.7 Slotted pin
11 Spindle
12 Bonnet
13 Bonnet stud
14 Bonnet nut
15 Spring
16 Washer
17 Adjusting screw
18 Adjusting screw nut
19 Cap
20 Cap top
21 Cap bolt
21.1 Hexagonal screw
22 Spindle nut
23 - 25 Gaskets •
26 Gasket •
27 Drain plug
29 Dowel
30 Pin
31 Retainer
32 Lower bearing plate
33 Bearing
34 Upper bearing plate
35 Signal pin
36 Intermediate flange / guide
36.1 Pipe
36.2 Hexagonal screw, bolt
36.3 Hexagonal nut
36.4 Locking plate
37 Retaining ring
38 Piston ring / slide ring •
39 Balanced piston
40 Dowel
43 Gasket •
44 Screw
45 Bellows lower part
46 Tightening nut
47 Gasket •
48 Holding ring
54 Guard ring
56 Baffle plate
• Recommended spare parts
10 ASSEMBLY DRAWINGS
Valve orifice D to J and below the pressure rates 09 (160)K and 03 (040)L.
TYPE SC..
Safety valve with closed bonnet for
vapours, gases and liquids

14
24
30
13
16
41, 42
10
2.1
21
31
18
27.1
11
16
12
29
19
2
22
40
20
49, 50
15
32
33
17
27
35
7
4
34
1
14
3
1/4" NPT
41, 42
25
25
2
27.1
11
16
12
10
24
30
13
16
19
35
22
40
20
49, 50
15
32
33
17
18
8
14
7
4
34
1
27
2.1
21
31
3
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
TYPE SO..
Safety valve with open bonnet for
steam and inert gases
TYPE SB..
Safety valve with balancing bellows and vented bonnet
for vapours, gases and liquids

15
2
1
2
5
1
2
23
5
1
2
23
1
1
2
1
2
5
6
26
7
7
5
6
26
2
1
23
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
BODY AND ADJUSTING RING DESIGNS
FLANGE CONNECTION ACCORDING TO DIN
FLANGE CONNECTION ACCORDING TO ANSI
Without adjusting ring
Type SC
Type SO
Type SB
With adjusting ring
Type SCR
Type SOR
Type SBR
Without adjusting ring
Type SCL
Type SOL
Type SBL
With adjusting ring
Type SC
Type SO
Type SB

16
39
38
36 39
38
37
36
46
9
8
44
48
45
47
36
39
38
36.4
36.2
32
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
DISC HOLDER AND SPINDLE DESIGN
BALANCED PISTON 144, TYPE SO
BELLOWS DESIGN P TO Z SPRING COMPRESSION FOR ORIFICE T TO Z
D to T T1 to Z
U to Z
M to T and above the
pressure rates 09 (160) K
and 03 (040) L

17
36.3
56
36.2
36.1
36
38
39
10.1
10.2
10.4
10.3
7.2
7.3
7.1
43
X
X
39
38
36
10
7.2
10.1
7.3
7.1
4
3
SEMPELL SERIES S, TYPES SO, SC, SB, SOH FULL-LIFT SAFETY VALVES
OPERATING INSTRUCTIONS
CAP DESIGN
DESIGN TYPE SOH
Detail X:
screw locking by
deformation
K to T and above the pressure rates
08 (160)H and 06 (063)J
D to G and below the pressure rates
08 (160)H and 06 (063)J U to Z
J to T T1 to Z
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