AWS 915 User manual

Read carefully before use.
Keep for future use.
We reserve the right to make technical changes.
EN
Englisch
AWS Apparatebau Arnold GmbH
Zimmerbachstraße 51
74676 Niedernhall - Waldzimmern
FON [phone]
FAX [phone]
MAIL [email protected]
WEB www.aws-apparatebau.de
Operating instruction
Dual check valve
Product line
915 / 916

CONTENTS
DUAL CHECK VALVE
Revision status: 03/05/2022 Index number: D0-115
1PREFACE.......................................................................................................................1
1.1 General....................................................................................................................................... 1
1.2 Target group.............................................................................................................................. 1
1.2.1 Personnel qualification.......................................................................................................... 1
1.3 Applicable documents.............................................................................................................. 1
1.4 Warranty..................................................................................................................................... 1
2SAFETY INSTRUCTIONS ..............................................................................................2
2.1 Warnings.................................................................................................................................... 2
2.2 Intended use.............................................................................................................................. 2
2.3 Requirements for the user....................................................................................................... 2
2.4 General safety instructions...................................................................................................... 3
3VALVE DESCRIPTION...................................................................................................5
3.1 Product lines.............................................................................................................................. 6
3.2 Intended use.............................................................................................................................. 6
3.3 Description of function.............................................................................................................. 6
3.4 Pressure test of the valve........................................................................................................ 7
3.5 Scope of delivery ...................................................................................................................... 7
4TYPE PLATES................................................................................................................8
4.1 Article description breakdown................................................................................................. 8
4.2 Type code .................................................................................................................................. 9
5STORAGE AND TRANSPORT.....................................................................................10
6INSTALLATION............................................................................................................11
6.1 Prepare installation................................................................................................................. 11
6.2 Installation instruction............................................................................................................. 12
7COMMISSIONING, DECOMMISSIONING, MAINTENANCE ........................................15
7.1 Commissioning........................................................................................................................ 15
7.2 Decommissioning.................................................................................................................... 15
7.3 Maintenance............................................................................................................................ 15
7.4 Remove pollutants.................................................................................................................. 15
7.5 Correct malfunctions and defects......................................................................................... 16
8REMOVAL....................................................................................................................17
8.1 Prepare removal...................................................................................................................... 17
8.2 Removal instructions.............................................................................................................. 17
9STORE / REUSE VALVE..............................................................................................17
10 DISPOSAL....................................................................................................................18
11 DECLARATION OF CONFORMITY..............................................................................18

1 PREFACE
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1 PREFACE
This operating instruction supports the user in the appropriate, safe and economical use of
the following valves:
Dual check valve of the product line 915 and 916.
1.1 General
These operating instructions apply to all the above-mentioned valves. To guarantee safe and
smooth use, the entire manual must be read and understood before installation and
commissioning. These instructions are intended to assist the user during installation,
operation, maintenance and removal. In addition to the instructions in this manual, all
applicable accident prevention regulations, safety rules, country-specific or system-specific
regulations and instructions must be observed. These operating instructions are an essential
part of the valve and must be kept available by the operator at the place of use, also for a
later use.
1.2 Target group
This instruction is intended for any person who is involved in work of any kind on the valve. In
particular, the operating instructions are intended for trained and qualified personnel.
1.2.1 Personnel qualification
All work on the valve must be carried out by qualified personnel only. If the personnel do not
have the required qualifications, they have to be trained. This must be ensured by the
operator. Persons without the required knowledge and skills are not permitted to work on the
valve.
1.3 Applicable documents
This includes the corresponding data sheet and the declaration of conformity of the above
mentioned valves. If necessary, these are to be requested from the manufacturer or
downloaded from the website.
1.4 Warranty
AWS Apparatebau Arnold GmbH does not assume any warranty in case the operator or third
parties:
disregard this document.
do not use the valve properly.
should carry out interventions of any kind (conversions, modifications, etc.) on the
valve.
Malfunctions due to pollution or wear of the valve as well as wearing parts (e.g. seals) are
not covered by the warranty.

2 SAFETY INSTRUCTIONS
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2 SAFETY INSTRUCTIONS
2.1 Warnings
The following warnings are used in this manual. In order to protect you from accidents,
injuries and damage to property, it is important to read and observe these warnings.
DANGER
High risk
Indicates an immediate danger. If not avoided, death or serious
injury will result.
WARNING
Medium risk
Indicates a potentially dangerous situation. If not avoided,
death or serious injury may result.
CAUTION
Low risk
Indicates a potentially dangerous situation. If it is not avoided,
minor or slight injuries may result.
NOTICE
Commandment
Indicates a potentially harmful situation. If not avoided, property
damage may result.
2.2 Intended use
AWS valves may only be used within the approved pressure and temperature limits,
considering chemical and corrosive influences. The valves are not suitable for fluids
containing solids. Intended use includes observing and following the instructions in this
manual. Modifications, conversions or any use of the valve other than the intended use are
considered to be improper use.
2.3 Requirements for the user
It is the responsibility of the planner/installer and operator to ensure that:
the valve is used as described in chapter 2.2 Intended use.
the piping system is properly installed and its proper functioning is regularly checked.
only qualified personnel are used for installation, removal and maintenance.
the valve is only professionally installed if it is in perfect condition.
the operating instruction are taken into account by the personnel.
personnel receive regular instruction in industrial safety and environmental protection
(especially for pressurized pipes).

2 SAFETY INSTRUCTIONS
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2.4 General safety instructions
The same regulations apply to all valves as to pipeline systems in which they are installed.
The national and international regulations with regard to accident prevention as well as
safety regulations must be observed by the operator.
DANGER
When working on the system
System must be switched off and secured against
unauthorized switch-on.
Pipeline must be pressureless to prevent uncontrolled
leakage of the medium.
Pipeline must have cooled down to approx. 20°C.
Medium must be completely removed from the valve
and pipeline.
Contaminated valve must be completely
decontaminated before work is performed.
Valves may only be installed, removed and maintained
by qualified personnel.
DANGER
When operating the system and the valve
In applications with explosion hazard, hot surfaces of
the system and valve parts can be a potential source of
ignition. This danger must be taken into account by the
operator.
WARNING
When working on the system
Any remaining liquid that may leak out during removal
must be collected and disposed of.
WARNING
When operating the system and the valve
Only media may be used which do not damage the
valve and its seals (suitable material pairing).
Otherwise, this can lead to leakage and leaking of the
medium.
When using media with a very low or very high
temperature, burns can occur when touching the
system parts or the valve housing. In this case, these
may only be touched with suitable protective equipment.
This must be done under the responsibility of the
operator of the system.
Pressure surges in the system can cause severe
damage and must be avoided. This is the responsibility
of the operator of the system.

2 SAFETY INSTRUCTIONS
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CAUTION
Risk of minor injuries
Wear protective gloves during installation, removal and
maintenance to avoid injuries from cuts on sharp-edged
components.
Always secure the valve adequately during transport,
installation and removal.
NOTICE
Notice of property damage
The valve and the system can be damaged if the valve
is not installed correctly.
Do not subject the valve to pressure surges; otherwise
the valve may be damaged.

3 VALVE DESCRIPTION
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3 VALVE DESCRIPTION
The following illustration describes the structure of the 915 and 916 product lines:
915
916 glandless
Pos.
Name
1
Body
2
Disc
3
Spring
4
Stem
5
Seat sealing
6
Spacer
7
Stem sealing
8
Screw
Pos.
Name
1
Body
2
Disc
3
Seat sealing
4
Spring
5+6
Stems
7+8
Spacer
9
Retaining plate
10
Fixing ring

3 VALVE DESCRIPTION
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3.1 Product lines
Product line
Characteristics
915
From DN 50 to DN 900.
With gland.
Centring via the outer diameter of the
body.
916 glandless
From DN 50 to DN 600.
Glandless.
Centering via the outer diameter of the
body.
3.2 Intended use
Dual check valves are valves used for backflow prevention in piping systems. AWS check
valves are characterized by their simple design as well as their short installation lengths
(according to DIN EN 558, series 16 or API 594). They are designed for direct installation
between two connecting flanges. The mentioned valves are suitable for industrial use in
pipeline systems for the transport of liquid and gaseous fluids. The valves are not suitable for
solids. According to guideline 2014/68/EU (Pressure Equipment Guideline) they are suitable
for all fluids of group 1 and 2.
3.3 Description of function
Dual check valves are medium-controlled backflow preventers and open when the opening
force of the medium is greater than the closing force of the discs. In case of absence (e.g.
pump failure) or backflow of the medium, the valve closes automatically.

3 VALVE DESCRIPTION
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3.4 Pressure test of the valve
The valve is leak-tested at the factory with air or water. Therefore the following warnings
must be observed:
CAUTION
Residues on the valve
Residues of the test medium may still be left on the
contact surfaces of the valve.
Be aware of possible reactions with the operating
medium.
During a system pressure test of the system, the following warning must be observed:
WARNING
Excess pressure of the valve
In a system pressure test of the system, the pressure
must not exceed 1.5 times the max. permissible
pressure PS of the valve.
3.5 Scope of delivery
The valve is supplied ready for installation.
For valves with the add-on option S79, an additional grounding cable is included in the scope
of delivery.

4 TYPE PLATES
Revision status: 03/05/2022 8 Index number: D0-115
4 TYPE PLATES
A type plate is attached to each valve. The features of the valve are listed on this type plate.
The following two illustrations show the structure of the different type plates of the 915 and
916 product lines.
Structure of a dual check valve type plate of the product line 915:
The flow direction of the valve is marked by an arrow on the body.
Structure of a dual check valve type plate of the product line 916:
The flow direction of the valve is indicated by the arrow on the left side of the type plate.
4.1 Article description breakdown
The following breakdown is an example of a standard valve for illustrative purposes.
Dual check valve type 915
Body: Stem:
Discs: Sealing:
Melting [Body/Discs]:
Order:
XQ12345
148560 /58 231 999
QX23658
1.4408
1.4408
1.4571
EPDM
915/ 100/ 1/ N/ F1
Material spring
= 1.4571
Material sealing
= NBR
Type
= Dual check valve
Design
= 1
Nominal size
= DN100