LarsLap S User manual

LarsLap Model S
Tools with the cutting edge
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LarsLap
Model S
Users Guide

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Welcome to the LarsLap family
Thank you for choosing LarsLap Valve grinder model S.
By choosing a LarsLap valve grinder you have received a high quality product
where we have carefully selected parts with great care for est possi le
performance.
To achieve a long and trou le free lifetime of your LarsLap Valve grinder, we ask
you to read this operation manual thoroughly efore you take the machine in
use and only to use original spare parts or parts recommended y LarsLap.
If there would e pro lems that are not included in this operation manual, we
ask you to contact your LarsLap dealer for further instructions.
We wish you good luck with your LarsLap valve grinder.
LarsLap
Helena Larsson Häger
President

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Contents Page
Safety Instructions 4
Instructions Prior and After Use 5
Parts 6-7
ow to use your LarsLap Valve Grinder 8-11
-Before you start 8
-Grinding a Gate Valve 9-10
-Grinding a Gate Valve Wedge 11
Recommended Service 12
Choosing Grinding Material 13
Recommended Grinding Abrasives 14
Accessories 15

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SAFETY INSTRUCTIONS
-Keep the working area clean. Dirty areas may cause injury.
-Evaluate working environment. Make certain that lighting is
satisfactory.
-Use suitable clothing. Do not wear loose clothes or accessories it can
cause injury.
-Wear protective goggles and ear protection. Use face or dust mask as
needed.
-Stand firm. Stand on steady ground and maintain alance while
working.
-Make certain that the air supply valve is in a closed position efore
connecting air.
-Before start, check the machine for damaged parts and make sure that
safety arrangements are working.
-Make sure that all adjusting keys, wrenches and other tools are
removed before starting the machine.
-Be alert, and keep your eyes on the jo . Use common sense. Do not
operate the machine if you are tired or taking medication.
-andle the machine with care. Careless handling can affect the
machine capacity and accuracy.
-Keep wires and ca les from heat oil and sharp edges.
-Do not overload the machine. Performance is est at designated load.
-Store all tools in the supplied case. Keep the case in a locked and dry
facility.
-Keep unauthorized people away. Do not permit untrained visitors or
staff to e in contact with the tools.
-Use of parts not authorized y LarsLap may cause damage to the
equipment and could cause injury to the operator.
-Personnel authorized y LarsLap must repair damaged machinery.
- Caution!!!! All electrical equipment must e handled with care. Do not
under any circumstances open parts of the electrical motor or charger!
This can cause serious body injury or death y electric chock or damage
the machine.
- Never use a attery charger on floor or ground, keep away from water
and dust. Damaged charger may not e used.

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Instructions prior to and after use
Your valve grinder model S is manufactured and
tested according to LarsLap specifications and high
standards. To ensure your S a long and trou le free
lifetime, please follow the instructions elow.
Prior to and after use you must consider the following:
-Check all parts to make sure that they are not dama-
ged or have een influenced so that the performan-
ce can e effected, if so contact your LarsLap dealer
for further instructions.
-That all parts are cleaned from water, dirt, oil and
grinding dust.
-Check the schedule provided in the case that no parts
are missing efore and after use.

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Parts
A fully equipped LarsLap model S-C 100 valve grinder consists of:
Part no. Qty Description Picture
40 101 00 1 Gate valve drive shaft including
pneumatic reversi le motor
40 004 00 1 Machine frame
40 005 00 1 Wedge plate
40 006 00 1 Mounting plate
90 301 01 1 Regulator (pneumatic option)
93 300 01 1 Grinding plate DN 25 mm
93 300 02 1 Grinding plate DN 32 mm
93 300 03 1 Grinding plate DN 40 mm
93 300 04 1 Grinding plate DN 45 mm
93 300 05 1 Grinding plate DN 50 mm
93 300 06 1 Grinding plate DN 65 mm
93 300 07 1 Grinding plate DN 80 mm
93 300 08 1 Grinding plate DN 100 mm

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Part no.
Qty
Description
90 531 01 100 Grinding disc SPA P80 17mm
90 531 02 100 Grinding disc SPA P80 20mm
90 531 03 100 Grinding disc SPA P80 25mm
90 531 21 100 Grinding disc SPA 100µ 17mm
90 531 22 100 Grinding disc SPA 100µ 20mm
90 531 23 100 Grinding disc SPA 100µ 25mm
90 531 41 100 Grinding disc SPA 100µ 17mm
90 531 42 100 Grinding disc SPA 100µ 20mm
90 531 43 100 Grinding disc SPA 100µ 25mm
90 900 26 1 Hexagon screw driver 6 mm
1Hexagon screw driver 3 mm
1Allen key set 1,5 – 6 mm
1Measuring tape 2 m
1Flash light
10 103 33 1 Operations manual
10 101 11 1 Spare parts kit
Check the specifications for your machine and make
sure that it has been delivered complete.

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ow to use your LarsLap valve grinder
Before you start:
1. Make sure that no parts are missing or damaged, if
necessary contact your LarsLap dealer for advice.
2. Measure the internal (A) and external (B) diameter of the
seat.
3. Measure the distance (C) etween the center of the seat
and the flange top.
4. To make sure that the machine and grinding-material will
work as expected, clean the valve from moisture and dirt.
5. In the case that you S is equipped with a pneumatic drive
unit, make sure that you have a sufficient air supply with a
maximum of 8 ar.
6. After measuring A and B choose the correct grinding plate.
7. Before you assem le the grinding heads, make sure all con-
tact surfaces are cleaned carefully.
8. Mount the grinding plate on the drive shaft as shown on the
pictures.
9. When the grinding plate is assem led on the drive shaft
check it in the valve to make sure that there is adequate
space.
*Grinding of a gate valve, continue on page 9
*Grinding of a gate valve wedge, continue on page 11

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Grin
ding of a ga
te
val
ve bo
dy.
Model S
Continued from How to use your LarsLap valve grinder on page 8
11. Assem le the mounting plate. Ensure the pointed gru
screws on the clamp (A) are visi le 6-8 mm. Fasten the
mounting plate on the flange or valve ody and lock y
tightening the clamp screw (B) with a torque a out 20 Nm.
To make the grinding easier the mounting plate should e
placed ehind the seat, ut can, if necessary e placed
anywhere around the flange. Make sure that all 3 pointed
gru screws (A) are locked on to the ody.
12. If the flange has non remova le olts a recommendation is
to use the mounting device for narrow seats (part num er
90 401 00).
13. Assem le the machine frame so that the drive shaft clamp
reaches out, over the seat, this to make sure you receive a
positive angle etween the drive shaft and the seat.
Tighten the 4 screws (C). Adjust the drive shaft mount plate
to a perpendicular position with the pressure feed (D).
14. Attach the grinding discs on the plate as shown on the
picture (see recommendation on page 16).
Always start with a finer grit and check the seat after one
minute of grinding. If the damage is small continue with
the same grit or finer.
15. Hold the drive unit steady and mount it on the machine
frame and make sure that the fixed point depth
adjustment clamp point (E) falls in position. Set the vertical
position of the unit y releasing and tightening the
adjustment clamp (F). Lock the drive unit using the two
kno s (G). For adjustment in the horizontal plane, use the
side adjustment kno (H). Remem er to use care while
adjusting the drive shaft depth, a dropped drive shaft could
cause damage to the equipment. Adjust drive shaft angle
y using the grinding pressure kno (I).
16. Attach the speed regulator on the mounting plate y using
the two screws (J). Connect the air hose to the speed regu-
lator. Make sure that the shut off valve (K) is closed efore
you connect the air supply and that the air regulator (L) is
closed (turned counterclockwise). To e a le to operate
the kno you have to lift the kno and then turn.
A
B
C
D
E
F
G
I
K
L
H
J

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17. Add a light grinding pressure a out 0,5 kg. Start the machine
slowly y opening the shut off valve (K) maximum and then turn
the regulator kno (L) clockwise until correct speed is reached
(60-80 rpm). Add sufficient grinding pressure 1-2 kg (half to a
whole revelation on the grinding pressure kno ).
18. Change direction of the rotation every 2-3 minutes to get the
most out of the grinding discs. You might have to adjust the air
input when working the air motor in reversed direction due to
power loss.
19. When changing grinding discs, stop the machine y turning of the
shut off valve (M) and disconnect the air hose. Release grinding -
pressure and loosen the drive unit with the clamp kno (H) and
then lift the whole drive unit out of the valve and change grin-
ding discs. When the discs are switched, re-install the drive unit
ack in the valve and tighten the clamp kno (H), re-connect the
air supply, add grinding pressure and continue the grinding -
procedure.
20. To grind the seat on the opposite side. Rotate the driveshaft 180°
and add pressure the opposite way.
21. When you are done grinding go thru the machine and check for
damages. Make sure that all parts are cleaned and dried efore
you put them ack in the case. Do a final check that all parts are
in the ox.

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Grin
ding of a ga
te
val
ve wed
ge.
11. Assem le the machine frame on the wedge plate as the picture
shows. Place the wedge on the plate and lock it with the wedge
lock (A).
12. Attach the appropriate grinding discs to the grinding plate (see
recommendation on page 20).
11. Hold the drive unit steady and mount it on the machine frame
and make sure that the fixed point depth adjustment clamp
point (E) falls in position. Set the vertical position of the unit y
releasing and tightening the adjustment clamp (F). Lock the drive
unit using the two kno s (G). For adjustment in the horizontal
plane, use the side adjustment kno (H). Adjust drive shaft angle
y using the grinding pressure kno (I).
13. Mount the air regulator on the wedge plate. Connect the air ho-
se to the regulator. Make sure that the shut off valve (H) is clo-
sed efore you connect the air supply and that the regulator
kno (I) is closed (turned counterclockwise), to e a le to opera-
te the kno you have to lift the kno and then turn.
14. Add a light grinding pressure and rotate the driving head y
hand one turn to check that the whole wedge is covered, then
start the machine slowly y opening the shut off valve (K) maxi-
mum and then turn the air regulator kno (L) clockwise until you
received the correct speed (60-80 rpm). Add sufficient grinding
pressure (half to a whole revelation on the grinding pressure
kno ).
15. Change direction of the rotation every 2-3 minutes to get the
most out of the grinding discs. You might have to adjust the air
input when working the air motor in reversed direction due to
power loss.
16. When you are done grinding go thru the machine and check for
damages. Make sure that all parts are cleaned and dried efore
you put them ack in the case. Do a final check that all parts are
in the ox.
A
E
I
G
H
F
L
K

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Service schedule.
External gears (1)
Graphite spray (Loctite 8191 or similar)
Every 50 hour in use
Internal gears (2)
MoS2 grease (Molykote BR2plus or similar)
Every 100 hour in use

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Choosing grinding material.
Before you start the grinding, check what type of material the seat is made of.
Make sure that the seat is clean efore you start.
Start grinding with a relative fine (for the surface) grit and just grind a short
while, 20-40 seconds, inspect the surface and determine the damage or there
might not e any damage so you just have to change grit to a finishing grit, ut
if there is a damage you have to decide what grinding material and grit you
need to use (see list on the next page).
LarsLap Grinding discs SPY/SPX (grit)
Is a very useful disc and the most commonly used together with the LarsLap
valve grinders. The grinding material is a mix of Aluminum Oxide and Ceramic,
and can e used for the hardest material and to take away a lot of material.
Only diamond discs and LarsLap Long Life oron nitride discs is capa le
removing harder seat material.
Grinding discs (micron)
This is the mostly used for the finer type of grinding and polishing. LarsLap 3M
discs are produced so that all grinding grains are the exact same size which
produces a smooth surface on most of the materials. Availa le all the way
down to 3 microns.
Diamond
Used at hard surfaces and heavy cutting ut not on materials like rass or
stainless steel. For stainless LarsLap Long Life oron nitride is recommended.
As lu ricant you can use water. Too high speed will urn the diamond.
LamPlan (Polishing)
For lapping surfaces, is used with diamond paste or diamond slurry.

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RECOMMENDED GRINDING ABRASIVES
SEAT CONDITION BRASS SEAT STAINLESS STEEL SEAT STELLITE SEAT
Gr/µ Material Gr/µ Material Gr/µ Material
Poor Condition
1 180µ Micron Alumina 40-80 Gr LL Ceramic Alumina 40-80 Gr LL Ceramic Alumina
2 100µ Micron Alumina 80 Gr LL Ceramic Alumina 80 Gr LL Ceramic Alumina
3 70µ Micron Alumina 120 Gr LL Ceramic Alumina 120 Gr LL Ceramic Alumina
4 35µ Micron Alumina 180 Gr LL Ceramic Alumina 180 Gr LL Ceramic Alumina
5 35 µ Micron Alumina
___
Gr/µ Material Gr/µ Material Gr/µ Material
Normal Condition
1 180µ Micron Alumina 80 Gr LL Ceramic Alumina 80 Gr LL Ceramic Alumina
2 100µ Micron Alumina 120 Gr LL Ceramic Alumina 120 Gr LL Ceramic Alumina
3 70µ Micron Alumina 180 Gr LL Ceramic Alumina 180 Gr LL Ceramic Alumina
4 35µ Micron Alumina 35µ Micron Alumina 35µ Micron Alumina
Gr/µ Material Gr/µ Material Gr/µ Material
Good Condition
1 100µ Micron Alumina 120 Gr LL Ceramic Alumina 120 Gr LL Ceramic Alumina
2 70µ Micron Alumina 180 Gr LL Ceramic Alumina 180 Gr LL Ceramic Alumina
3 35µ Micron Alumina 35µ Micron Alumina 35µ Micron Alumina
Gr = Grit
µ = Micron
Permanent diamond & LarsLap Long Life boron nitride adding plates available for stellite and
other hard seated material

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Options for your LarsLap S
Part no. Description Picture
40 000 00 Grinding plate DN125
40 000 00 Grinding plate DN150
90 401 00 Mounting device for narrow
90 402 00 Distance plates

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Lars
Lap
Sunnorpsgatan 19
SE-582 73 LINKÖPING • Sweden
Phone [phone] • Fax [phone]
E-mail: [e-mail] • www.larslap.com
Developed and produced in
the country of SWEDEN