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manufacturer's factory. When doing a pressure test of
a pipeline section with installed valves, the following
instructions must be observed:
Valve open: The test pressure must not exceed 1.5 x
the PN specified on the rating plate
Valve closed: The test pressure must not exceed 1.1 x
the PN specified on the rating plate
Newly installed pipeline systems should first be thoroughly purged
to remove all foreign particles. If residues or dirt particles are pre-
sent in the pipeline, they might clog the installations while the
pipeline is being purged. This may impair the function of the valve
or even block it.
In particular after repair work or upon the commissioning of new
equipment, the pipeline system is to be purged again with the
valve being fully open. If detergents or disinfectants are used,
it must be ensured they do not attack the valve materials. As a
standard, the valve is closed by turning clockwise at the gear.
The dimensions of the stems and actuators allow operation of the
valve by one person via the handwheel. Extensions for operation
are not permissible as they may damage the valve due to exces-
sive force. The 90° turn is limited by a limit stop located at the
gear. If it is turned further using excessive force, this may cause
a break. Proper function is to be checked by opening and closing
the valve several times.
6
Actuators
6.1 General
For manual operation (handwheel and hand lever), normal manual
forces are sufficient. The use of extensions to increase the op-
eration torque is not permissible.
The use of hand levers is possible for valves from DN 40 to DN
200.
The position of the manual lever shows the position of the valve:
• Hand lever 90° across the pipeline: valve closed
• Hand lever in parallel to the pipeline: valve open
Actuators (gears, pneumatic, hydraulic and electric actuators) are
designed for flow velocities according to Table 2 in EN 1074-1
(valves used for water supply; requirements relating to fitness for
use). Any deviating operating conditions need to be specified. The
adjustment of the limit stops (OPEN, CLOSE) must not be changed
without the manufacturer's consent. If a valve is installed without
gear it must be ensured that such a valve is not pressurised.
For detailed information on gears and actuators, please refer to
the operation manuals issued by the manufacturers of these com-
ponents (e.g. AUMA, Rotork). In some cases the manuals need to
be obtained by the user himself.
VAG CEREX
300 Butterfly Valves have an adjustment angle of
®
90°. The valve itself is not equipped with position limiters. The
actuator must be equipped with limit stops.
The limit position adjustment is to be done in compliance with the
operating manuals issued by the respective gear manufacturers,
such as AUMA, Rotork etc. In case a gear is retrofitted, its nominal
torque and the adjustment of the limit stops "OPEN" and "CLOSE"
must be adapted to the valve.
Non-compliance with these regulations may result in danger for
life and limb and/or cause damage to the pipeline system. If actu-
ators powered by external sources of energy (electric, pneumatic
or hydraulic) have to be disassembled from the valve, the safety
instructions under Section 1.1 need to be observed and the ex-
ternal source of energy must be switched off.
For valves equipped with pneumatic actuators, the direction of
rotation of the actuator must be selected so that the limit stop is to
be adjusted when the valve is in closed position. In case of valves
equipped with spring-return actuators the disk protrudes from the
body on both sides when the valve is delivered. The packaging of
the protruding edge is provided to protect the disk against dam-
age. The micro-finished sealing face at the edge of the disk must
not be damaged.
6.2 Operating torques
Operating torques are the maximum required torques [in Nm] at
the driven shaft at full differential pressure.
• The torques specified are stated for liquid and lubricating media
without safety factor
DN
50
65
80
100
125
PN 10
8
18
28
35
65
PN 16 10
20
30
40
80
Table 2: Torques at the valve shaft
• Electric actuators have to be designed with an additional safety
factor of 1.5
• If required, please contact us to enquire about the respective
torques and/or adjustment torques for electric actuators
• the torques of valves operated in dry media need to be de-
signed with a safety factor of 2.0
Butterfly valves with a dry profiled seal require higher
actuating torques when they are operated for the first
time!
• the dimensions of the actuator flanges and shaft ends can be
found in Section "Design"
6.3 Assembly of the electric actuator
The electric actuator is mounted to the input flange of the gear.
The actuator size is selected according to the maxi-mum actua-
tion elements.
The valve is switched off:
• position-dependent in Open position
• position-dependent in Closed position
The switching points are factory-adjusted. The torque switches
serve as overload protection in the intermediate positions. If the
valve is retrofitted with an electric actuator, the position switches
have to be adjusted after the actuator has been mounted. For the
adjustment procedure, please refer to the operating manual is-
sued by the manufacturer of the electric actuator.
The relevant safety regulations of the VDI / VDE and the instruc-
tions of the manufacturer of the electric actuator must be ob-
served.
When the items are delivered, the adjustment screws and the
VAG Operation and Maintenance Instructions • 11
150
200
250
300
350
400
450
90
150
250
320
450
875 1130 1900 2200
110
190
300
400
600 1000 1275 2100 2500
500
600
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