Figure 21: QT-series Settings for closed position.
The setting for closed position can be changed by using E3C, see Eltorque
E3C Manual.
The actuator must have enough torque to operate the valve in all situations
with an acceptable safety margin. Valve type, temperature, operating
pressure, medium density and viscosity and the medium’s effect on the
valve friction are among the variables that need to be evaluated. A change in
any of these variables may change the required operating torque. Preferably,
a torque table with all parameters should be used, but for an electrical
actuator, the output torque is constant, reducing the considerations to be
made. The break to open (BTO) value usually indicates the most suitable
actuator to use. The break to open torque is defined as the torque required
to move the valve out of the seat.
Be aware that the MAST of the valve needs to be verified to prevent damage
to the stem. Eltorque can assist in selecting the correct actuator size for the
valve.
For the QT-series, the closing time is configurable within a predesigned
interval. The opening and closing profiles are shown in the product
datasheet.
The actuator is configured from a computer, and it is delivered with the
configuration specified by the customer. Eltorque provides the E3C
configuration software, which runs on a standard PC and the corresponding
User Manual E3C Software.
The software can be downloaded from the Eltorque website
www.eltorque.com – Technical Support – Software.
The Eltorque Configuration Cable is required to connect the actuator to the
configuration PC/PLC. Therefore, it must be ordered separately, see Chapter
8 Ordering Information and Recommended Spare Parts on page 81.
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