Instructions for use DOMINO valves
AT 100 / 150 / 200 / 300 / 400/ 600
AT-Betriebsanleitung (GB) (GR) 16.06.2011 4 / 6
5. Initial Operation
5.1 General measures
Before finally putting the valves into service, all the important elements (plate, spindle, piston rod, etc.) must
be cleaned thoroughly. Any damage to the plate, especially to the seal as a result of sand-blasting debris or
welding beads, external rust, etc., is not covered by the warranty.
Cleaning agents that include solvents especially those based on aromatic hydrocarbons (thinners, petroleum
spirit and the like) must not be allowed to get into contact with the seal.
5.2 Shutting off powdery or granular media
When shutting off powdery or granular media, ensure that any wetness or humidity caused by the installation
work and which might cause a subsequent caking of the medium must be thoroughly removed before the
installation is started up when using the medium. Malfunctions of the valve caused by agglutination or caking
of powdery media are not covered by the warranty.
5.3 Control pressure / use of control media
Check the input of the control pressure as the maximum permissible upper limit before applying pressure to
hydraulic and pneumatic cylinders. The maximum permissible control pressure will be stated in the order
confirmation. No other medium may be used other than the specified.
5.4 Pneumatically-operated valves
Before initial operation, all the air lines provided by the customer as well as the pneumatic control valves
must be thoroughly blown and also cleaned if necessary.
We recommend the use of lightly oiled compressed air to actuate the cylinder. We recommend the following
oils for the maintenance units: Shell Tellus Oil C 10, Wintershall Wiolan HN 46 or equivalent.
In operation, 1-2 drops per 1000 litres of air will be sufficient. Unless explicitly stated otherwise when
ordering, pneumatic control valves installed by us are supplied without accessories such as chokes or
silencers. The stipulations at the customer’s site must be followed.
Pneumatically-operated valves should not be closed suddenly, as otherwise there is a risk of pressure shock
(i.e. water-hammer).
5.5 Hydraulically-operated valves
Before initial operation, all the control lines provided by the customer must be thoroughly cleaned. We
recommend the use of the following oils to actuate the cylinder: Wintershall Wiolan HN 46 or equivalent.
Hydraulically-operated valves should not be closed suddenly, as otherwise there is a risk of pressure shocks
( i.e. water-hammer). Choker valves set at the factory must not be altered.
5.6 Electrically-operated valves of series AT 100 / 150 / 200 / 300 / 400 / 600
Closing may be done exclusively according to our instructions, as follows:
- only switch off in the closing direction by using a torque switch
- only switch off in the opening direction by using the path switch, the torque switch that is there serves as
overload protection and must also be closed
- in the case of custom-made valves such as of series AT 700 / 750, switching-off is done according
to our separate instructions
In the case of freely programmable controllers, the path switch and torque switch must be connected immediately
before the contactor coils. For functional reasons, only self-locking actuators may be used.
Signal transfer at the path switch and torque switch to switch off the electrical actuator must be done in real time.
Signal chaining via multiple contactors or positioning units causes the drive units to run on and can lead to the
destruction of certain components.
To avoid any risk of damage to the valve before it is operated electrically for the first time, move the plate by hand
to the middle position and only then operate the valve by means of the actuator.
