Leser 526 API User manual

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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Type 526 API

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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Contents
1Purpose............................................................................................................... 2
2Scope.................................................................................................................. 2
3References.......................................................................................................... 3
4Disclaimer............................................................................................................ 3
5Qualified fitting personnel.................................................................................... 3
6General Information............................................................................................. 3
7General illustration .............................................................................................. 4
8Preparation for valve assembly ........................................................................... 5
8.1 Emboss the punch numbers (if requested in the order)................................ 5
9Assembly of type 526.......................................................................................... 5
9.1 Assembly of the nozzle and blow down ring................................................. 5
9.2 Screw the studs into the body. ..................................................................... 7
9.3 Installation of the locking screw and screw plug........................................... 7
9.4 Assembly of disc assembly.......................................................................... 9
9.5 Assembly of spindle/disc assembly............................................................ 13
9.6 Assembly of the bonnet.............................................................................. 24
9.7 Determination and installation of the lift stopper......................................... 25
9.8 Assembly of the adjusting screw................................................................ 28
9.9 Adjusting the set pressure.......................................................................... 30
9.10 Testing the seat tightness P12................................................................... 31
9.11 Assembly of the cap / lever ........................................................................ 31
9.12 Assembly of the lift indicator....................................................................... 38
9.13 Installation of the test gag (possible for H2 and H4)................................... 40
9.14 Installation of the different O-ring dampers ................................................ 41
9.15 Adjusting the set pressure.......................................................................... 45
9.16 Testing the seal tightness of the back seal P21 ......................................... 45
9.17 Sealing the valve........................................................................................ 45
1 Purpose
This LESER Global Standard (LGS) describes the assembly procedure for a LESER
safety valve type 526 API.
2 Scope
This document must be applied to the assembly of an API safety valve in agencies
and subsidiaries of LESER GmbH & Co. KG.

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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3 References
LGS 3325 (LWN 322-04)
WI 3308-08 (LWN 308-08)
LGS 3323 (LWN 322-03)
WI 3324-01 (LWN 324.01)
4 Disclaimer
LESER puts in a great deal of effort into making up-to-date and correct
documentation available. Nevertheless, LESER GmbH & Co. KG gives no guarantee
that the recommended actions presented here are entirely correct and error free.
This document is to be used exclusively with the specified type. LESER GmbH & Co.
KG declines any liability or responsibility for the correctness and completeness of the
content.
LESER GmbH & Co. KG reserves the right to change the information contained in
this document, which is for the products of LESER GmbH & Co. KG and is intended
for LESER subsidiaries, at any time and without prior announcement.
LESER GmbH & Co. KG is available to the users of this document to provide
additional information.
5 Qualified fitting personnel
The assembly of LESER safety valves may only be performed by trained or qualified
fitters. The qualifications must be obtained through the appropriate training
measures.
6 General Information
Gloves must be worn during the entire assembly.

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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7 General illustration
Figure 7-1: Cross-sectional view of API 526

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Assembly instructions for type 526 API
LGS 4104
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8 Preparation for valve assembly
8.1 Emboss the punch numbers (if requested in the order).
Illustration
Description
Aids / Tools
Figure 8.1-1
Emboss the code into the
edge of the outlet flange
(position of the code as
per the work plan).
Hammer
Punch numbers
9 Assembly of type 526
9.1 Assembly of the nozzle and blow down ring
Illustration
Description
Aids / Tools
Figure 9.1-1
Grease sealing surface
Brush
Assembly
grease
(Molykote
Paste)

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Assembly instructions for type 526 API
LGS 4104
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Illustration
Description
Aids / Tools
While screwing the nozzle
into the body, the
protection of the nozzle
should stay in place to
secure the sealing surface
against damage.
Figure 9.1-2
Screw nozzle into the
body.
Figure 9.1-3
Tighten nozzle with C-
spanner (put a small
protective slab between
the nozzle and C-
spanner).
C-spanner with a
nose

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Assembly instructions for type 526 API
LGS 4104
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Figure 9.1-4
Screw the blow down ring
completely down to the
nozzle.
9.2 Screw the studs into the body.
Illustration
Description
Aids / Tools
Figure 9.2-1
Screw in the studs with an
impact wrench.
Tip: Place the guide washer
on the opening of the body
so that no studs can fall on
the seat.
Impact wrench
9.3 Installation of the locking screw and screw plug
Illustration
Description
Aids / Tools
Figure 9.3-1
Grease the locking screw
and screw plug.
Brush
Halocarbon
(OI-56 S / 60H)

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Assembly instructions for type 526 API
LGS 4104
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Figure 9.3-2
Grease a spacer ring for
each of the screws and put
on as a seal.
Illustration
Description
Aids / Tools
Figure 9.3-3
Screw the locking screw into
the back section of the body
and tighten.
Open-end
spanner
Figure 9.3-4
Screw the screw plug into
the side of the body and
tighten.
Open-end and
ring spanner

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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9.4 Assembly of disc assembly
9.4.1 Metal seat
Illustration
Description
Aids / Tools
Figure 9.4.1-1
Put disc body and lifting aid
together and clamp in place.
Clamping block
Figure 9.4.1-2
Insert retaining ring and
tighten with C-spanner.
C-spanner with
a nose
9.4.2 O-ring seal
Illustration
Description
Aids / Tools
Figure 9.4.2-1
Individual parts of the disc
assembly with O-ring seal

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Assembly instructions for type 526 API
LGS 4104
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Illustration
Description
Aids / Tools
Figure 9.4.2-2
Wet O-ring with water and avoid any
twisting when introducing it.
Figure 9.4.2-3
Insert retainer.
Figure 9.4.2-4
Screw nut onto neck and tighten.
(Set torque as per LGS 3325 ).
Torque wrench
with socket
attachment
Clamping block

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Assembly instructions for type 526 API
LGS 4104
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Illustration
Description
Aids / Tools
Figure 9.4.2-5
Secure the nut by hitting it
with a centre punch
Centre punch
Hammer
Figure 9.4.2-6
Emboss the marking for the
O-ring material according to
WI 3308-08 .
Punch
numbers
Hammer

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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9.4.3 Disc with sealing plate
Illustration
Description
Aids / Tools
Figure 9.4.3-1
Individual parts of the disc assembly with
sealing plate
Figure 9.4.3-2
Put the sealing plate in the disc.
Figure 9.4.3-3
Put the retainer on the sealing plate.
Figure 9.4.3-4
Screw nuts onto studs and tighten (torque
as per LGS 3325 ).
Secure the nut by hitting it with a centre
punch
Emboss the marking for the sealing plate
material according to WI 3308-08 .
Torque wrench
with socket
attachment
Centre punch
Hammer
Punch
numbers

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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9.5 Assembly of spindle/disc assembly
9.5.1 Assembly of spindle/disc assembly (without bellows)
Illustration
Description
Aids / Tools
Figure 9.5.1-1
Insert the ball into the disc.
Figure 9.5.1-2
Push on spindle and insert small
balls into the screw opening of the
disc.
Possibly
tweezers
Figure 9.5.1-3
Screw in and tighten the clamping
screw.
Ring spanner

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Assembly instructions for type 526 API
LGS 4104
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Illustration
Description
Aids / Tools
Figure 9.5.1-4
Put on lift stopper, if requested.
(variable lift stopper; possibly
determine in advance; see Chap.
10)
Figure 9.5.1-5
Push on guide washer. Put half-
washers in the recess of the
spindle and secure with a
retaining clip.
Figure 9.5.1-6
Push the lower spring plate, the
spring and the upper spring plate
onto the spindle.

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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9.5.2 Assembly of spindle/disc assembly (with stainless steel bellows)
Illustration
Description
Aids / Tools
Figure 9.5.2-1
Stainless steel bellows and
guide washer
Figure 9.5.2-2
Grease the sealing surface
and thread of the bellows.
Brush
Assembly
grease
(Molykote
Paste)
Figure 9.5.2-3
Twist the guide washer onto
the bellows.
In some cases, larger
bellows have an inside
thread and are screwed on
the corresponding outside
thread of the guide washer.
Fix the guide washer in the
vice and tighten it.
(Torque as per LGS_3323)

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
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Illustration
Description
Aids / Tools
Figure 9.5.2-4
Stainless steel bellows and guide
washer
Figure 9.5.2-5
Sparingly apply one drop to the
thread of the spindle.
Glue
DELO ML
5327
Figure 9.5.2-6
Quickly screw the spindle
together with the bellows hand
tight.
Figure 9.5.2-7
Put the cooling zone onto the
spindle.

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Assembly instructions for type 526 API
LGS 4104
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Illustration
Description
Aids / Tools
Figure 9.5.2-8
Put the disc on the spindle. Put
the balls into the opening of the
disc, or alternatively secure the
disc with a pin (depending on the
disc version).
Figure 9.5.2-9
Screw the clamping screw into
the disc hole.
Ring spanner
Figure 9.5.2-10
Put half-washer into the recess
and secure with a retaining clip.

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LGS 4104
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9.5.3 Assembly spindle/disc-construction group (with stainless steel bellow and
without balanced piston)
Operate the assembly of the
stainless steel bellow like in
chapter: 9.5.2.up to incl. Figure
0-8. Then assembly balanced
piston as follows.
(a) Put the sealing ring (pos.60)
on the guide washer.
(b) Afterwards push the balanced
piston above the spindle. (pos.29)
Put half-washer into the recess
and secure with a retaining clip.
Balanced Piston

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Assembly instructions for type 526 API
LGS 4104
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9.5.4 Assembly spindle/disc-construction group (with stainless steel bellow and
balanced piston)
Operate the assembly of the
stainless steel bellow like in
chapter: 9.5.2.up to incl. Figure
0-8. Then assembly balanced
piston as follows.
(a) Put the sealing ring (pos.60)
on the guide washer.
(b) Afterwards push the balanced
piston above the spindle. (pos.29)
Put half-washer into the recess
and secure with a retaining clip.
Balanced piston

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LGS 4104
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9.5.5 Insert construction group (without bellow)
Insert disc-/spindle
construction group
carefully into the
body.
While doing so
press the guide
washer down and
lift the spindle
slightly up, so that
the disc does not
land.
Put the disc with the
spindle carefully on
the seat.
Fixture according to
fixture catalogue
Put the spring and
the upper spring
disk on the lower
spring disk.