Emerson Sempell series User manual

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
Before installation these instructions must be fully read and understood
Emerson.com/FinalControl VCIOM-02468-EN 18/08© 2017 Emerson. All Rights Reserved.
Series
VSE 0 Full lift safety relief valve and normal
safety valve.
For media of -196°C to +200°C
The application temperature of 200°C must not
be exceeded during normal operation. In case
of a guaranteed local temperature of the safety
valve not higher than 200°C (e.g. because of a
remote arrangement), the operational medium
temperature of the system to be protected can
be clearly exceeded (up to about 300°C).
Design
Design according to TO.270.01.
• closed spring bonnet
• spring-loaded (cylindrical compression
spring)
Also applicable to the following accessories:
• SN 102, without easing gear
• SN 123, disc for liquids
• SN 124, disc with O-ring
Seat diameter do = 7.5 mm; 9.0 mm
Nominal size: DN 15 and 25, NPS ½ and 1
Observe design data on the tagplate!
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.
1 DANGER AND WARNING INDICATIONS
The construction of the Sempell safety valves
corresponds to the latest state of engineering
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 these operating instructions 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.
Please observe the following points besides
the notes given in the text:
• Danger of burning at safety valves and with
the connected pipes while operating under
increased temperature.
• Disassembly of the safety valve only in case of
pressureless plant and 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
clearly reduced pressure to avoid unintended
response.
• Carry ear protection during adjustment,
ifnecessary.
• Danger of injury while discharging at
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.
Exclusion of liability
Sempell GmbH cannot be held liable in case
of improper maintenance and adjustment of a
Sempell safety valve, use of inadmissible spare
parts or utilities and in case of a temporary or
permanent connection of equipment with the
safety valve which is not approved by us.
MA.270.01.1215 E

2
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
Take the material specification and the admissible pressure from the nameplate of the valve.
Material specification Area of operating temperatures
16 -196 to +200°C
17 -10 to +200°C
3 OPERATION
3.1 Warning indications for the operation
Observe safety regulations!
2 DESCRIPTION
Spring-loaded full lift safety relief valves and
normal safety valves are direct acting safety
valves to protect pressure tanks 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. At normal operating conditions the
valve seat will be held tight.
By changing the spring compression it is
possible to change the set pressure. In case
of exceeding set pressure, the pressure of the
medium prevails and the safety valve opens.
With full lift characteristic the safety valve
opens rapidly at full lift and discharges the
total mass flow necessary to prevent a further
pressure increase.
With normal characteristic the safety valve
reaches the lift necessary for the mass flow
to be discharged after the response within a
pressure increase of max. 10%.
After a defined pressure decrease, the safety
valve closes again.
By means of the lifting lever at the cap the
safety valve can be opened by hand at a set
pressure of 85% at least.
The safety valves are type tested and comply
with the requirements of the standards and
regulations.
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 range
• Electrical / pneumatical 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.
ATTENTION
Unstable behaviour of safety valves such as
chattering or vibrating can destroy the valve seat,
the safety valve or the pipe 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: lay 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 valve cautiously.
Maximum weight: 7 kg
At delivery the outsides of all ferritic parts of
the safety valve are supplied with a coat of paint
except the welding edges.
The insides of the body 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
approx. six months.
A storage of more than six months asks for
disassembly and visual check of the inner parts
of the safety valve. A weather-protected outside
storage is not allowed.

3
X
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
3.3 Installation instructions
NOTE
Clean pipes before installing safety valves since
otherwise the valve seats can be damaged by
foreign bodies when discharging!
Remove transport protection just before
installation.
Check plant identification and details on the
nameplate.
3.3.1 Installation
The installation zone must be easily accessible
for maintenance works. Required free
space above the safety valve see section
“Dimensions”. In case of large safety valves
provide for additional space for lifting gears, at
least 500 mm.
Position of installation vertical, inlet from
below. Do not brace valve body when fastening;
if necessary compensate bearing of the
supporting brackets.
Lay line in such a way that neither static or
dynamic forces nor forces caused by thermal
expansion may be transferred to the valve body.
PLEASE NOTE
Stresses at the valve body may lead to leaking at
the valve seat!
3.3.2 Inlet line
Arrange safety valve directly at the nozzle of the
tank to be protected, if possible. Otherwise lay
inlet line between tapping point and safety valve
as short and as poor in resistance as possible.
In no case the inlet line diameter must be
smaller than the inlet nominal size at the
safety valve. The pressure loss of the inlet line
must not exceed 3% of the set pressure at the
greatest 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 pipe and thus lead to failure of the
safety function or to shutdown of the plant!
For discharge of condensate in case of gases
and vapours, the inlet line must have a slope to
the tapping point of 15 degrees at least.
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.
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 tanks. Oxygen causes cracking and
embrittlement.
If these requirements are guaranteed for
products out of elastic materials, the storage
time is approx. 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
Guide bush (2): protection by net coat
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.
ATTENTION
Condensate at the inlet of the safety valve
changes the functional behaviour and may lead
to an inadmissible pressure increase. Danger of
explosion!

4
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
3.3.3 Exhaust line
In no case the exhaust line diameter must be
smaller than the outlet nominal size at the
safety valve.
Back pressures in the exhaust line are
admissible up to 15% of the set pressure
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 pipe and thus lead to failure
of the safety function or to shutdown of the plant!
At the deepest point the exhaust line must
be equipped with a drain which is big enough
to discharge 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 insulation is
not sufficient!
Recommendation! Sound isolate exhaust line
and/or provide the same with silencer; in doing
so, regard allowable back pressure!
ATTENTION
An icy, frozen or clogged exhaust line leads to the
failure of the safety function! Danger of explosion
in case of excess-pressure!
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!
3.3.4 Insulating
In case of hot medium insulate inlet line and
valve body. In case of gases and vapours
insulate inlet line and valve body very carefully
to avoid condensation.
ATTENTION
Condensate at the inlet of the safety valve
changes the functional behaviour and may lead
to an inadmissible pressure increase; danger of
explosion!
The spring bonnet shall not be insulated as with
heated spring the set pressure decreases.
3.4 Pressure test
The response of the safety valves must be
prevented. For this purpose flange off the safety
valve and close the inlet line by means of a
blind flange.
ATTENTION!
After the pressure test, restore und control the
ready-to-operate state!
3.5 Commissioning
The safety valve is delivered ready to operate.
The set pressure is adjusted at works and
secured against unauthorized adjustments
by lead seal. Higher medium temperatures
can lower the set point by about 1% per 100°C
and ask for a readjustment under operating
conditions.
ATTENTION
When discharging, some leaking medium may
pass at the top of the spring bonnet (8) in case of
unscrewed cap (12)(17). Danger of scalding by hot
medium!
3.6 Operational test
Function and reliability of the safety valves are
proved by the type test. Generally operational
tests are therefore not carried out in the
system. This is usual for steam boiler safety
valves only.
3.7 Discharge test
• Apply ear plugs.
• Slowly increase operating pressure in the
system until the safety valve has fully opened.
• Lower operating pressure until the safety
valve closes.
In case of several discharge tests with hot
medium allow intermediate cooling down of the
safety valve as caused by heating of the spring a
slight decrease of the set pressure is possible.
3.8 Adjustment of the set pressure
ATTENTION
A change of the lead sealed spring adjustment
must only take place in the presence of the
competent inspector.
The adjustment of the set pressure takes place
on the test stand. If the set pressure is adjusted
in the plant, the pneumatic measuring device
A 143 should be applied as by means of this
device the set pressure can be adjusted without
increasing the operating pressure.
ATTENTION
Adjusting only with lowered pressure. At operating
pressure working on the adjusting screw (10) may
lead to unintended response of the safety valve.
When discharging, some leaking medium may
pass at the top of the spring bonnet (8) in case of
unscrewed cap (12)(17). Danger of scalding by hot
medium.
Remove lead seal. Unscrew cap (12) or (17). For
cap (17) with easing gear, first screw off stuffing
box (18) including lever (21); in doing so, hold
lever (21) in vertical direction.
Loosen lock nut (11). For working at the
adjusting screw (10) secure stem (4) or (14)
against torsion, as otherwise the valve seat
may be damaged. Hold stem (4) e. g. with a pin
or stem (14) e.g. with a fixed spanner at the
checked hexagonal nut (16).
Tighten adjusting screw (10) (turn right): set
pressure higher
Loosen adjusting screw (10) (turn left): set
pressure lower
After the adjustment secure adjusting screw
(10) with lock nut (11). Assemble cap (12) or (17)
and lead seal.
Standard values for the change of the set
pressure in % for a quarter turn of the adjusting
screw (10):
Orifice letter SKB Changes in %
7.5 10
9.5 8

5
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
3.9 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
Liquids:
Opening excess pressure: +10% p
Closing excess pressure: -20% p or 0.6 bar for p smaller than 3 bar
3.10 TROUBLE SHOOTING
Malfunction Cause Remedies
Safety valve opens at different pressures 1. Condensate in the inlet 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 inlet line is greater than the closing
pressure difference
1. Reduce flow resistance of the inlet line: Expand, shorten
or remove constrictions. Fast remedy: Decrease lift (as
far as allowed), therefore diminish outflow
2. Discharge quantity is too small because the subsequent
flow is too small
2. Install smaller safety valve or adjust discharge quantity
3. Admissible back pressure is exceeded in the exhaust line 3. Decrease flow resistance of the blow-off line: e.g. by
expanding or shortening the pipe
4. Dynamic pressure drop in the inlet line, especially in case
of liquids
4. Provide safety valve with a vibration damper
Closing pressure difference is too great 1. Saturated steam with high moisture 1. Insert spring (6) with higher tension
Safety valve stays open after discharge test 1. Foreign bodies between body seat and disc (3) 1. Repeat discharge test or blow off foreign bodies by
lifting the lever (21). Otherwise disassemble valve
Safety valve fails to close tightly 1. Valve seat damaged 1. Disassemble valve. Rework valve seat and disc (3)
2. Body forming by pipe forces 2. Lay pipe elastically
3. No slope of the inlet line in case of hot liquids 3. Assemble inlet line with slope to the safety valve or lay
siphon-type bend
4 INSPECTION AND MAINTENANCE WORKS
Inspection intervals depending on frequency
of response and operating conditions,
e.g.annually, under severe conditions twice a
year. Keep certificates about performed works.
During patrols
• Check valve in regard of tightness.
Therefore observe the following indications:
whistling noises, medium emerging at the
bonnet, medium at the drain nozzle or in the
exhaust line.
During each inspection
• Check all gaskets. Replace them if leaky.
• Control seat faces.
• Smooth valve seat and disc (3) with fine
lapping paste. If necessary, replace disc (3).
• Smooth guide areas of the stem (4) and guide
bush (2) without material abrading machining.
• In case of damaged ball (5) replace also
disc(3) and stem (4) at the same time.
At larger intervals, e.g. each 3 years
• Completely disassemble safety valve.
• Clean and control valve parts.
• Rework valve seat and disc (3) with fine
lapping paste; if necessary, replace disc (3). In
case of rework observe functionally important
outlines at the valve seat.
• Replace spring (6) in case of corrosion or
temperature damage and adjust set pressure
again.
• Smooth guide areas of the stem (4) and guide
bush (2) without material abrading machining.
• Lubricate adjusting screw (10).
• Treat sliding guides not in contact with the
medium, fits, gaskets and threads with an
assembling lubricant.
ATTENTION
Do not treat valve seats, metallic sealing surfaces
and sliding guides in contact with the medium.
ATTENTION
For oxygen application all parts in contact with the
medium must be free from oil and grease. Danger
of explosion!

6
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
5 DISASSEMBLY
5.1 Danger and warning indications
ATTENTION
Take work order and wait until the installation is
switched free.
Check if the valve is pressureless and
cooleddown.
Residual medium may escape when opening and
disassembling the valve; also at pressureless
plant further evaporations are possible.
Loosen spring bonnet (8) only when the spring(6)
is released as otherwise the thread of the spring
bonnet (8) cannot absorb the initial stress of the
spring (6).
5.3 Tools
• fixed spanner 10 - 55 mm
• seal wire, lead seal, lead-sealing pliers
• piston ring pliers
• vernier calliper
• flatnose pliers
• lapping wheel according to valve seat
• side cutting pliers
• fine emery cloth
• pin Ø 2 mm
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).
5.2 Instructions for disassembly
• For works at the adjusting screw (10), secure
stem (4) or (14) against torsion as otherwise
the valve seat can be damaged. Hold stem (4)
e. g. with a pin. Hold stem (14) e.g. with a fixed
spanner at the checked hexagonal nut (16).
ATTENTION
For oxygen application all parts in contact with the medium must be free from oil and grease.
Danger of explosion.
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:
Grease: Manufacturer / Supplier:
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:
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
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 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

7
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
5.5 Dismantling the safety valve
Remove lead seal. Unscrew cap (12) or (17). For
cap (17) with easing gear, first screw off stuffing
box (18) including lever (21); in doing so, hold
lever (21) in vertical direction. Measure and
record distance between upper edge of stem (4)
or (14) and adjusting screw (10).
Detach and remove checked nuts (15) (16).
Loosen lock nut (11) and release spring (6)
by means of adjusting screw (10). Screw off
spring bonnet (8). Remove spring (6) and spring
plate (7). Lift off disc (3) and guide bush (2)
simultaneously e. g. with a piston ring pliers.
Disassemble stuffing box (18) with lever (21)
only if necessary.
6 ASSEMBLY
Assemble disc (3), guide bush (2), sealing ring
(9), stem (4) or (14), spring (6) with spring plates
(7) and spring bonnet (8). Prestress spring (6)
by means of adjusting screw (10) onto the same
dimension as measured before disassembling.
Thus, the same set pressure as before. Secure
adjusting screw (10) with lock nut (11).
Lay on gasket (13). Screw on cap (12). In case
of cap (17) with easing gear, screw off nuts
(15) (16) at the upper end of the stem (14) and
secure it. Screw open cap (17) and thread in
stuffing box (18) with lever (21) over gasket (24);
in doing so, hold lever (21) in vertical position. In
case of unscrewed cap (17) the lever (21) shall
have a backlash of approx. ± 15°. Otherwise
shift checked nuts (15) (16). Lead seal cap (12)
or (17).

8
d2
d1
d0
d0 d1 d2 f1 f2 f3
H8 +0.10 -0.05 +0.05 -0.10 +0.05
7.5 8.25 9.45 0.50 0.50 0.30
9.0 9.90 10.95 0.50 0.50 0.30
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
9 DECLARATION TO EC-DIRECTIVE
The declaration of conformity can be found in
the documentation.
7 DIMENSIONS FOR MOUNTING BRACKET
Disc for gases, vapours Disc for liquids SN 123
Valve seat for gases, vapours and liquids
8 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.
8.1 Lapping area production
8.1.1 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.
8.1.2 Valve seat
The preferred method is hand operated
machine lapping in case the valve seat is
installed 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.
8.2 Lapping area site
As a rule, there is no lapping machine available
so only a manual method or the method
described in Section 8.1.2 can be used.
8.2.1 Disc (3)
Depending upon their 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 approx. 200 mm diameter lap the
discs with a mobile manual lapping machine
according to section 8.1.2.
8.2.2 Valve seat
Procedure see Section 8.1.2.
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.
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.

9
12
11
13
10
14
7
8
6
9
2
5
28
1
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
PARTS LIST
Part Name
1Body
2Guide bush
3 • Disc
4 • Stem
5Ball
6Spring
7Spring plate
8Spring bonnet
9 Gasket
10 Adjusting screw
11 Lock nut
12 Cap
13 • Gasket
14 • Stem
15 Round nut
16 Hexagonal nut
17 Cap
18 Stuffing box
19 Gland
20 Shaft
21 Lever
22 Packing
23 Hexagonal nut
24 • Sealing ring
25 Inlet flange
26 Outlet flange
27 Gasket
28 Disc for liquids
30 Disc with O-ring
• Recommended spare parts
10 PART LIST AND ASSEMBLY DRAWINGS
VSE 0 WITHOUT EASING GEAR

10
17
16
15
19
23
22
18
20
24
11
13
10
14
21
7
8
6
9
2
5
3
1
SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES
Operating instructiOns
VSE 0 WITH EASING GEAR
Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product.
Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Sempell is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson
and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by
our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without
notice.
Emerson.com/FinalControl
Technical Information and Customer Service:
Sempell GmbH
Werner-von-Siemens-Straße
41352 Korschenbroich
Germany
Phone [phone]
Fax [phone]