VAG Operation and Maintenance Instructions • 3
order is placed and/or before installation. Cavitation must always
be prevented.
For the respective technical application ranges (e.g. operating
pressure, medium, temperature) please refer to the specific prod-
uct-related documentation (KAT-A 1331).
For any deviating operating conditions and applications, the man-
ufacturer’s written approval must be obtained!
These Operation and Maintenance Operation Instructions contain
important information on the safe and reliable operation of the
VAG CEREX
®
300 Butterfly Valves.
Observing these Operation and Maintenance Instructions helps
you to:
• Prevent hazards
• Reduce repair costs and down-times of the valve and/or the
entire plant
• Improve the operational safety and useful life expectancy of the
equipment.
For the butterfly valves, the same safety regulations
must be complied with as those applicable to the entire
system they are in-stalled in.
These Operation and Maintenance Instructions only
provide safety instructions which apply in addition for
the butterfly valves. Also, the Operation and Mainte-
nance Instructions supplied for the components to be
assembled must be understood and observed.
In accordance with German “DVGW Standard” W332 (section
5.2.2) centric butterfly valves for the earth installation are unsuit-
able.
1.3 Identification
According to DIN EN 19 all valves bear an identification label
specifying the nominal diameter (DN), nominal pressure (PN),
body material and the manufacturer’s logo.
A rating plate is attached to the body and contains at least the
following information:
VAG
Manufacturer’s name
DN
Nominal diameter of the valve
PN
Nominal pressure of the valve
Body material EN-JS 1030 (GGG-40 – nodular cast iron)
Disk
Material depending on type
Profiled seal Material depending on type
Date of manufacture
2 Transport and Storage
2.1 Transport
For transportation to its installation site, the valve must be packed
in stable packaging material suitable for the size of the valve. En-
sure that the valve is protected against atmospheric influences
and external damage. When the valve is shipped under specific
climatic conditions (e.g. overseas transport), it must be specially
protected and wrapped in plastic film and a desiccant must be
added.
1 General
1.1 Safety
These Operation and Maintenance Instructions must be observed
and applied at all times along with the general “VAG Installation
and Operation Instructions for Valves” (see www.vag-group.com /
Category: Installation and Operation Instructions).
Arbitrary alterations of this product and the parts supplied with it
are not allowed. VAG will not assume any liability for consequen-
tial damage due to non-compliance with these instructions. When
using this valve, the generally acknowledged rules of technolo-
gy have to be observed (e.g. DIN standards, DVGW data sheets
W332 Butterfly Valves, VDI directives, etc.). The installation must
only be carried out by qualified staff (see also Section 7.1 General
safety instructions). For further technical information such as di-
mensions, materials or applications, please refer to the respective
documentation (KAT-A 1331).
VAG valves are designed and manufactured to the highest stand-
ards and their safety of operation is ensured in general. However,
valves may be potentially dangerous if they are operated improp-
erly or are not installed for their in-tended use.
All personnel dealing with the assembly, disassembly, operation,
maintenance and repair of the valves must have read and under-
stood the complete Operating and Maintenance Instructions (Ac-
cident Prevention Regulations, VBG 1 §§ 14 and following [Regu-
lations issued by the Trade Associations] and ANSI Z535).
Before removing any protective devices and/or performing any
work on the valves, depressurise the pipeline section and ensure
it is free of hazards. Unauthorised, unintentional and unexpected
actuation as well as any hazardous movements caused by stored
energy (pressurised air, water under pressure) must be prevented.
In the case of equipment that must be monitored and inspected,
all relevant laws and regulations, such as the Industrial Code, the
Accident Prevention Regulations, the Ordinance of Steam Boilers
and instructional pamphlets issued by the Pressure Vessels Study
Group must be complied with. In addition, the local accident pre-
vention regulations must be observed.
If a valve serving as an end-of-line valve is to be opened
in a pressurised pipeline, this should be done with the
utmost care to prevent the emerging fluid from causing
damage. Care must also be taken when closing the
valve in order not squeeze your hands. WAFER-type
butterfly valves must never be used as end-of-line
valves.
When a valve needs to be dismantled from a pipeline, fluid may
emerge from the pipeline or the valve. The pipeline must be emp-
tied completely before the valve is dismantled. Special care needs
to be taken in case of residues which may continue flowing.
1.2 Proper use
The VAG CEREX
®
300 Butterfly Valve is a shut-off valve for in-
stallation between pipelines (WAFER-Type and LUG-Type) or for
installation to the pipeline flanges (LUG-type).
The VAG CEREX
®
300 Butterfly Valve is intended to shut off the
medium. Its use as a control valve is only possible within certain
limits.
If a valve is used for continuous control operation, the operation
limits must be coordinated in consultation with VAG before the