END ARMATUREN DG2D AX Series Installation instructions

END-Armaturen GmbH & Co. KG
Oberbecksener Str. 78 · D-32547 Bad Oeynhausen · Telefon [phone] · Telefax [phone] · http://www.end.de
Original Operating Manual
Pressure Actuated Valves
DG2D, DA2D, DL2D, DM2D, DF2D, DFZ,
DG3D, DA3D, DL3D, DM3D, DF3D
.../AX version acc.to European Directve 2014/34/EU (ATEX)
for the use in explosive atmosphere

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© by END-Armaturen GmbH & Co. KG
All rights reserved. No part of this publication may be copied or published by means of printing,
photocopying, microfilm or otherwise without prior written consent of
END-Armaturen GmbH & Co.KG. This restriction also applies to the corresponding drawings.
END-Armaturen GmbH & Co. KG has the right to change parts of the valves at any time without
prior or direct notice to the client. The contents of this publication are subject to change without
notice.
This publication has been written with great care. However, END-Armaturen GmbH & Co. KG
cannot be held responsible, either for any errors occurirng in this publication or for their consequences.
The products are specified by the statements in this documentation; no assurance of the properties is given.
END-Armaturen GmbH & Co. KG
Oberbecksener Straße 78
D-32547 Bad Oeynhausen
Telefon: 05731 / 7901 - 0
Telefax: 05731 / 7901 - 999
Internet: http://www.end.de
E-Mail: [email protected]
Edition: 10/2019
Impressum

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Contents
Contents
1 Foreword 5
2 General advice 6
2.1 Validity 6
2.2 Inward monitoring 6
2.3 Complaints 7
2.4 Guarantee 7
2.5 Symbols and their signfication 7
3 Safety advice 8
3.1. Personal protection 8
3.1.1. Safety advice for mounting 8
3.1.3 Safety advice for adjustment and starting 9
3.2 Device safety 10
4 Device description 11
4.1 Device description 11
4.2 Device variants 12
4.3 Name-plate 13
4.4 Explosion proof identification 14
4.5 Description of function 14
4.5.1 Description of function: Pressure actuated valve (2/2-way) 14
4.5.1.1 Normally close with the flow direction 15
4.5.1.2 Normally close against the flow direction 16
4.5.1.3 Normally open, close against the flow direction 16
4.5.1.4 Double acting 16
4.5.2 Description of function: Pressure actuated valve (3/2-way) 17
4.5.2.1 Split function 17
4.5.2.2 Mixing function 17
4.6 Description of options function 18
4.6.1 Pilot valve (Option) 18
4.6.2 Position indicator (Option) 18
4.6.3 Optical position indicator (Option) 18
4.6.4 Stroke stop (Option) 18
4.6.5 Electrical position indicator (Option) 18
4.6.6 Manual override (Option) 18
5 Mounting / Disassembly 19
5.1 Electrical installation 19
5.2 Mounting of a valve with threaded connection 20
5.3 Mounting of a valve with welded connection 20
5.3.1 Protection of the sealings by using Heat Absorbing Paste 20
5.3.2 Protection of the sealings by disassembling the valve top 21
5.3.2.1 Disassembly of the valve top 21
5.3.2.2 Mounting of the valve top 22
5.4 Mounting of the valve (flanged connection) 23
5.5 Connection of the pilot medium 24
5.6. Mounting of a pilot valve (Option) 25

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Contents
5.6.1 Pneumatical installation of a pilot valve 25
5.6.2 Electrical installation of a pilot valve 25
5.7 Disassembly 26
5.7.1 Mechanical disassembly 26
6 Starting 27
7 Failure 27
7.1 Failure causes 27
8 Maintenance / Cleaning 28
8.1 Maintenance 28
8.2 Cleaning 28
9 Declaration of conformity 29
10. Annex 30
10.1 Conditions in the potentially explosive area 30
10.2 Equipment groups acc. to EC-directive 2014/34/EU, Annex I 30

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1 Foreword
Dear customer,
Dear assembler / user,
these operation and installation manuals are intented to give you the knowledge which is neces-
sary for you to be able to carry out the mounting and adjustment of an pressure actuated valve
DG2D rapidly and correctly.
Please read these instructions carefully and pay particular attention to the advice and warning
notes.
Only instructed and qualyfied mechanician should mount, adjust or maintain the pressure acting
valves.
The pressure acting valves will be deliver in several versions relative to
- pilot pressure and pressure range
- operations
- material
- connection type and connection size.
There are also several options available.
With accessories
- it can switch the pilot media
- it can indicate the position of the piston
- it can happen a manual override
- it can stop the stroke
The field of use of this valve is predominantly
- in food and drink industry
- in chemical installtions
- in ventilation and blower construction
- in heating and air-conditioning technology
- in industrial fittings
- in water treatment etc.
If you have any questions in relation to the pressure acting valves DG2D, we shall be pleased to
answer them.
The telephone number will be found on the inside cover of these operation and installtion manual.
Yours
END-Armaturen GmbH & Co. KG
Foreword

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2 General advice
2.1 Validity
These mounting and operating manual is valid for the explosion proofed versions of the pressrue
actuated vales:
DG2Dxxxxxxx/AX..
DA2Dxxxxxxx/AX..
DL2Dxxxxxxx/AX..
DM2Dxxxxxxx/AX..
DF2Dxxxxxxx/AX..
DFZxxxxxxx/AX..
DG3Dxxxxxxx/AX..
DA3Dxxxxxxx/AX..
DL3Dxxxxxxx/AX..
DM3Dxxxxxxx/AX..
DF3Dxxxxxxx/AX..
and their variants:
- with X as a perface to the type
- and a appendage to the type (e.g. /A05)
Advice
The products descript in this documentation in the conditions of our delivery are partly completed
machinery according to annex 2 paragraph g of the directive 2006/42/EC on machinery, which must not
be put into service until the final machinery into which it is to be incorporated has been declared in
conformity with the provisions of the Directive 2006/42/EC on machinery, where appropriate.
Please take notice to the Declaration of incorporation and the assembly instruction.
2.2 Inward monitoring
Please check
- directly after delivery the valve for any transport damages and deficiencies
- with reference to the accompanying delivery note the number of parts.
Do not leave any parts in the package.
General advice

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2.3 Complaints
Claims for replacement or goods which relate to transport damage can only be considered valid if
the parcel service / forwarder has notified without delay.
In case of returns (because of transport damage / repair), please make a damage protocol and
send the parts back to END-Armaturen, if possible in the original packaging,
In case of a return, please mention the following:
• Name and address of the consignee
• Order-/ article-number
• Description of the defect.
2.4 Guarantee
For our pressure actuated valve we give a guarantee period in accordance with the sales contract.
The end of the normal duration of live of the wearing parts represents no defect.
The warrently and guarantee rules of END-Armaturen GmbH & Co. KG are applicable.
2.5 Symbols and their signfication
Paragraphs which are identified with this symbol contain very important advices; this also includes
advices for averting health risks. Oserve these paragraphs without fail!
Paragraphs which are identified with this symbol contain very important advices; this also includes
how to avoid damage to property. Observe these paragraphs without fail!
This symbol indicates paragraphs which contain comments/advice or tips.
This bullet identifies the description of actions which you should carry out.
Symbols and their signification

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3 Safety advice
Depending on the technical circumstances and the time under and at which the valve is mounted,
adjusted and commissioned, you must in each case take into account particular safety aspects!
If, for example, the valve works in an operational chemical plant, the potential hazards of commis-
sioning have another dimension from that when this is only being carried out for test purposes an
a „dry“ part of the plant in the assembly room.
Since we do not know the circumstances at the time of the mounting/adjustment/commissioning,
you may find advice on hazards in the following descriptions which are not relevant to you .
Please observe (only) the advice which applies to your situation!
3.1. Personal protection
3.1.1. Safety advice for mounting
We wish to point out expressly that the mounting, the electrical installation and the adjustment
of the valves and the accessories must be carried out only by trained specialist personnel having
mechanical and electrical knowledge!
Switch off all the devices / machines / plant affected by mounting or repair.
If appropriate, isolate the devices / machines / plant from the mains.
Check (for example in chemical plants) whether the switching off of devices / machines / plant
will cause potential danger.
If appropriate, in the event of a fault in the valve (in a plant which is in operation) inform the
shift forman / safety engineer or the works manager without delay about the fault, in order, for
example, to avoid an outflow / overflow of chemicals or the discharge of gases in good time by
means of suitable measures!
Before mounting or repair, remove the pressure from pneumatic / hydraulic devices / machines
/ plant.
Emty the conduit from medium.
If necessary, set up warning signs in order to prevent the inadvertent starting up of the devices /
machines / plant.
Observe the respective relevant professional safety and accident prevention regulations when
carrying out the mounting / repair work.
Check the correct functioning of the safety equipment (for example the emergency push off but-
tons/ safety valves, etc)!
Safety Advice

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Safety Advice
3.1.3 Safety advice for adjustment and starting
As a result of the starting (pneumatic or by hand) of a pressure actuated valve the flow of gases,
steam, liquids, etc. may be enabled or interrupted!
Satisfy yourself that, as the result of the starting or the test adjustments of the valve, no potential
hazards will be produced for the personnel or the environment!
If necessary, set up warning signs in order to prevent the inadvertent starting up or shutting down
of the devices / machines / plant.
By ending mounting check the correct function and the tightness of the valve.
Check the right position and correct function of mounted pilot valves and limit switches
Through suitable measures, prevent actuating links being trapped by moving actuating ele-
ments!
Check the right function of all saftey devices (for example emergency off push buttons / safety
valves, etc. )!
Carry out the starting and the adjustments only in accordance with the instructions discribed in
this documentation!
When adjustments are being carried out on an opened and switch on (operational) limit switches
or pilot valves, there is the risk that live parts(230V AC~) can be touched!
Therefore the adjustment must be carried out only by the electrican or a person having adequate
training, who is aware of the potential hazard.

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Safety Advice
3.2 Device safety
The pressure actuated valve
- is a quality product which is produced in accordance with the recognized industrial
regulations.
- left the manufacturer`s work in a perfect safety condition!
In order to maintain this condition, as installer / user you must carry out your task in accoedance
with the discritions in these instructions, technially correctly and with the greatest possible pre-
cision!
We assume, as trained specialist you are having mechanical and electrical knowledge !
The valves must be used only for a purpose corresponding to its construction!
The valves must be used within the values specified in the technical data.
Satisfy yourself that, as the result of the mounting, the starting or as a result of the test adjusments
on the valves, no potential hazards will be produced for devices / machines / plant!
Open the valve only to such an extant as described in this documentation!
Do not loose the locking ring of the pilot cylinder or don`t try to disassemble the pilot cylinder.
Do not mount the valve, start the valve or carry out any adjusments on it if the valve, the supply
lines or the part of the plant on which it is flange- mounted is damaged !
By ending mounting check the correct function and the tightness of the valve and check the cor-
rect function of the pilot valve and limit switches.

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Device Descriptions
4 Device description
4.1 Device description
1 Valve body
2 Pilot cylinder
3 Screw joint
4 Cap
5 Connection
6 Pilot port
7 Flow direction indicator
8 Name plate
9 Warning note
10 Connection for grounding
Fig. 4.1 - Device descriptions - front / rear
6
2
3
1
5
7
8
9
4
5
10
Armaturen
PE

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4.2 Device variants
The pressure actuated valves DG2D will be delivered in various variants.
The following table explains the composition of the article number to you. These article numbers
will be seen on the name plate:
For example: DG2D3112025/AX/OS
Pressure actuated valve, stainless steel / PTFE, normally close with the
flow direction, brass cylinder Ø80mm, G 1", optical position indicator
Device Variants
3. Digit
Ways
2. Digit
Connection
1. Digit
Product
D= Pressure actuated
valve
G= B.S.P. thread
DIN ISO 228 T1
A= Welded connection
DIN 3293
L= Welded connection
ISO 4200
M = Welded connection
DIN 11850-R2
F = flanges acc. to DIN
2531 / 2533 / 2545
2= 2/2-ways
3= 3/2-ways
6. Digit
Seals material
seat / stem
1= brass
2= bronze
3= stainless steel
4= Carbon steel
5= GG (grey cast iron)
6= GGG (ductile iron)
7= Light alloy
8= Plastic
4. Digit
Operation
D= direct acting
5. Digit
Body material
1= PTFE / PTFE
2= PTFE / NBR
3= PTFE / FKM
4= PTFE / EPDM
5= NBR / PTFE
6= NBR / NBR
7= FKM / FKM
8= FKM / PTFE
brass cylinder
0= Ø 32 mm
1= Ø 50 mm
2= Ø 80 mm
3= Ø 125 mm
(aluminium alloy)
4= Ø 100 mm
stainless steel cylinder
5= Ø 50 mm
6= Ø 80 mm
7= Ø 125 mm
(aluminium alloy)
8= Ø 100 mm
9= Ø 32 mm
threaded flanged and welded
connection connection
006 = G ⅛
008 = G ¼
010 = G ⅜
015 = G ½DN 15
020 = G ¾DN 20
025 = G 1 DN 25
032 = G 1¼DN 32
040 = G 1½DN 40
050 = G 2 DN 50
065 = G 2½DN 65
080 = G 3 DN 80
100 = G 4 DN 100
125 = others sizes DN 125
150 = on request DN 150
AX = version acc. to ATEX (obligatory)
ES = electric / mechanic position indicator
FL = flanged connection PN 16
HB = stroke stop
HN = manual override
HY = hygienic version
HO = stroke stop and optical position indicator
7. Digit
Operation
8. Digit
Piston- Ø
9. - 11. Digit
Connection
for 2/2-way-version:
1= Normally close
with the flow
direction
2= Normally close
against the flow
direction
3= Normally open
against flow
direction
4= Double acting
for 3/2-way-version:
1= split function
2= mixing function
15. - 20. Digit
Options
NI = inductive proximity limit switch
OF = free of oil and grease
OG = without valve body
OS = optical position indicator
NS = contactless position indicator (Reed-Kontakt)
V= for vacuum
VD = for vaccum and pressure

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Name-plate
4.3 Name-plate
The pressure acting valves DG2D will be provided with a name- plate, which permitts a definite
identification of the valves and shows the most important technical data to you. The name-plate
should not be displaced or changed
Abb. 4.2 - name-plate
Art.Nr. Article number of the valve (see also chapter 4. „device variants“)
Serie Order- or production-number
Betriebsdruck (PS) Max. admisable working pressure of the valve [bar]
Steuerdruck Recommend pilot pressure of the valve[bar]
Temperatur (TS) Temperature range of the valve
Größe (DN) Connecting size of the valve
Prüfdruck (PT) Testing pressure of the valve
Fluidgruppe Allowed fluid group of the valve
Herstellung Date of manufacturing
II 2G Ex h IIC T4 Gb : explosion proofed identification
II 2D Ex h IIIC T135° Db
END-Armaturen GmbH & Co. KG
D-32547 Bad Oeynhausen
+49 (0)5731 - 7900-0 www.end.de
Art.Nr.: DG2D3122050/AX
Serie: 220885
Betriebsdruck (PS): 8 bar
Steuerdruck: 6 bar
Temperatur (TS): -10°C ... +100°C
Größe (DN): 50 / G2"
Prüfdruck (PT): 12 bar
Fluidgruppe: 1
Herstellung: 14.02.2002
0062
II2G Ex h IIC T4 Gb
II2D Ex h IIIC T135° Db

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Device Variants
4.5 Description of function
4.5.1 Description of function: Pressure actuated valve (2/2-way)
A slanting seat in the valve body will be closed with or against the flow direction by a valve disk.
The valve disk is connected with the piston by a stem. It`s dynamical sealing and guidance hap-
pens by a screw joint between valve body and pilot cylinder. The slanting valve design renders a
highly flow rate by low dirtyness.
Pressure actuated valves would be actuated wit a piston by a neutral pilot media (air, water, oil).
It works in a pressure range from 0 bar up to the max. nominal pressure which you can see in the
pressure table. The flow direction is fixed and signed on the valve.
4.4 Explosion proof identification
The pressure actuated valves are having an explosion proof identification, which shows the details
of the protection class to you:
Explosion proof identification of the pressure actuated valve:
Group II
Category 2G/2D (for zone 1 and zone 21)
Explosion proof classification: h - constructional safety
Temperature class (max. temperature of the surface):
T4 : Tmax. = 135°C
T5 : Tmax. = 100°C
T6 : Tmax. = 85°C
4.5 Corresponding use
Pressure actuated valves are work equipment with constructional safety designed for applicati-
ons in atmospheres according to category 2G (zone 1 + zone 2) / 2D (zone 21 + zone 22).
The max. temperature of the media, depending ot the switching frequency per minute, should not
exceed the following values:
  85°C(n≤5/min)/40°C(n≥60/min) at temperature class T6
  100°C(n≤5/min)/65°C(n≥60/min) at temperature class T5
  135°C(n≤5/min)/100°C(n≥60/min) at temperature class T4. (n: Open- Close- cycle)
The ambient temperature should not exceed 60°C.
By using the pressure actuated valves, observe that the flow rate of potentially explosive media
inside the pressure actuated valve will be less than:
 v≤2m/sforpotentiallyexplosiveliquidsand
 v≤20m/sforpotentiallyexplosivegaseousfluids.
II 2G Ex h IIC T4 Gb
II 2D Ex h IIIC T135°C Db
II 2G Ex h IIC T5 Gb
II 2D Ex h IIIC T100°C Db
II 2G Ex h IIC T6 Gb
II 2D Ex h IIIC T85°C Db

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Description of Function
Fig. 4.4 - description of function - normally closed with the flow direction
© END-Automation GmbH & Co. KG
4.5.1.1 Normally close with the flow direction
The in neutral position closed valve obtains this function by a spring, which acts in close direction.
By feeding with compressed air the pilot pressure moves the piston against the spring and lift up
the valve disk from the seat. Therefore the valves open.
Because the valve closes with the flow direction, the nominal pressure supports the closing pro-
cess and seals the valve disk against the seat additionally. If the media flows through the valve with
a high speed the valve could close to fast and this could causes pressure shocks in the pipes.
The electrical control signal will be changed into the pressure media control by an optional avai-
lable solenoid valve. The figure 4.3 shows a directly mounted solenoid valve type MGAG3D.
Fig. 4.3 - description of function (Options: optical position indicator, solenoid vavle)
valve closed valve opend by
compressed air
valve closing by
spring force
© END-Armaturen GmbH & Co. KG

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Description of Function
4.5.1.3 Normally open, close against the flow direction
The in neutral position opened valve obtains this function by springs mounted under the piston. The
valve closes against the flow direction only by the pilot pressure.
Fig. 4.6 - description of function - normally open, close against flow direction; double acting
Fig. 4.5 - description of function - Normally close against the flow direction
4.5.1.2 Normally close against the flow direction
The in neutral position closed valve obtains this function by a spring, which acts in close direction.
By feeding with compressed air the pilot pressure moves the piston against the spring and lift up
the valve disk from the seat. Therefore the valves open.
The valve closes against the flow direction only by the spring force. Therefore the valve closes
slowly and prevents pressure shocks in the pipes.
4.5.1.4 Double acting
The valve closes against the flow direction only by the pilot pressure. Also the valves opens with
the flow direction only by the pilot pressure.
© END-Automation GmbH & Co. KG
© END-Automation GmbH & Co. KG

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Description of Function
Fig. 4.8 - Description of function: mixing function
© END-Armaturen GmbH & Co. KG
A P1
P2
A P1
P2
Mischfunktion
A
P1P2
4.5.2.2 Mixing function
At this function the valve valve will be pressurized by two ports (P1/P2). In case of the position of
the piston flows from one of the two inlet ports to the outlet port. (P1►A / P2►A)
4.5.2 Description of function: Pressure actuated valve (3/2-way)
A straight seat in the valve body will be closed with or against the flow direction by a valve disk.
The valve disk is connected with the piston by a stem. It`s dynamical sealing and guidance hap-
pens by a screw joint between valve body and pilot cylinder. The 3/2-way pressure actuated valve
renders two functions: 1. split function
2. mixing function
Pressure actuated valves would be actuated wit a piston by a neutral pilot media (air, water, oil).
It works in a pressure range from 0 bar up to the max. nominal pressure which you can see in the
pressure table. The flow direction is fixed and signed on the valve.
4.5.2.1 Split function
At this function the valve will be pressurized by the inlet port P. In case of the position of the piston
the medium flows from the inlet port to one of the outlet ports. (P►A / P►B)
Fig. 4.7 - Description of function: split function
P B
A
P B
A
Aufteilfunktion
B A
P
split-function
mixing-function

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4.6 Description of options function
4.6.1 Pilot valve (Option)
The 3/2- ways pilot valve which is necessary to control the pressure actuated valve will be mounted
directly on the pilot cylinder or in an external control box. For double acting valves it is necessary to
install a 4/2-or 5/2-ways pilot valve. The valve position will be selected by feeding compressed air.
The actuating time will be controlled by throttle valves.
The declaration of conformity and the mounting and operating manual of the pilot valve will be
separatly add to the delivery of a pressure actuated valve.
4.6.2 Position indicator (Option)
The signal of the position of the pressure actuated valve can be indicate in different ways: by an
optical position indicator or by an electrical position indicator.
4.6.3 Optical position indicator (Option)
On the stem there is a red pin mounted, which indicates the position of the valve on top of the pilot
cylinder. The hole for the red pin in the pilot cylinder is covered by a clear plastic cap. You can see
the pin in the position „open“.
4.6.4 Stroke stop (Option)
You are able to limited the stroke in the valve by a stroke stop. Therefore you can regulate the flow
rate of the valve.
4.6.5 Electrical position indicator (Option)
The electrical positon indicator indicates the position of the valve over a long distance or sends a
electrical signal to a controll box. For this there are several position indicators available: electric-
mechanic position indicator, contactless position indicator (Reed- contact) or inductive proximity
limit switch.
By the different variants one or both valve positions can be indicated.
4.6.6 Manual override (Option)
By the option „Manual override“ the pressure actuated valve can be opened or closed by a hand
wheel. By turning the hand wheel the stem of the valve lift up the valve disk from the seat or senk
down the valve disk. See also chapter 9. „Emergency operation with manual override“.
Description of Function

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5 Mounting / Disassembly
The mounting of the pressure actuated valve ristricts to
- the mechanical mounting into the prescribed pipes
- the connection of the hose for the pilot medium with the pilot port
- the electrical mounting of accessories, e.g.. pilot valve or limit switch.
The installation of the pressure actuated valve is as you desired.
In the following description we assume, that you have read the former chapters attentive. We also
assume that you will observe the safety advices and warnings from chapter 3. „Safety advice“
during the mounting / disassembly.
If you have not read chapter
3 „Safety advices“
until now, read these important advices now and turn back to this page!
The mounting and the electrical installation must be carried out only by trained specialest per-
sonnel having mechanical and electrical knowledge!
The following figures are showing the pressure actuated valves without any options! Perhaps the
valve mounting by you is equiped with option!
Your device variant you can see at the name-plate on the pilot cylinder of the valve. For their
meaning see also chapter
4.2 „Name-plate“.
The mechanical installation are the same by all variants. It differs only by the type of connection.
Observe the flow direction, specified on the valve body.
Before mounting the valve clean up the pipes. Pollution will be reduce the safety and the lifetime of
the valve. If necessary mount a Y- strainer in front of the valve.
Avoif strains of the valve body by non align pipes.
5.1 Electrical installation
On principle you have to earth the pilot cylinder at the assigned connection for grounding.
The electrical installation depends on the used options. Therefore you have to observe the instal-
lation and operating manuals of the attached options.
Mounting / Disassembly

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5.2 Mounting of a valve with threaded connection
Before lay on sealing compounds,check the hardly screwing by the pipes into the valve body.
Lay on the correct sealing compounds on the pipes end. By using PTFE-ribbon or hemp sealings
observe the screw direction. Don´t use sealing compounds which are not prescribed for your
employment.
Screw the pipes into the connection ends of the valves. Don´t use the pilot cylinder as a lever.
Strike up the pipes with pressure after that time the manufacturer of the sealing compounds pre-
tends for harden it.
Check the tightness af all connections.
5.3 Mounting of a valve with welded connection
By welding the valve body with the pipes observe appropriate demands and guide lines.
The safety demands by welding are depending on the place and the position of the point of weld.
Welding the parts at a serviceable device/machine/plant the potential of danger is as higher as
welding the parts in a welding room.
If appropriate, inform the shift foreman / safety engineer or the works manager and the fire
brigade of your factory
By welding observe your own national guide lines about safety and prevention of accidents.
By welding the valve between the pipes you have to take measures first, to prevent the damage
of the sealings.
5.3.1 Protection of the sealings by using Heat Absorbing Paste
To protect the seals of the of a pressure actuated valve you have to apply a amount of heat absor-
bing paste (e.g. TECHNOLIT heat absorbing paste, BLOC-IT heat absorbing paste, METAFLUX
THERMEX) to the area to be protected.
By using the heat absorbing paste you have to observe the instructions of the manufacturer.
By making multiple welding seam, the valve will have to be cool down after every working opera-
tion.
Mounting / Disassembly