Valve And Actuator With Different Rated Travels - Samson 3241-7 Mounting And Operating Instructions

Assembling valve and actuator
2.3 Valve and actuator with
different rated travels
Actuator version "Actuator stem extends"
Note!
Valves that have a travel smaller than the
rated travel of the actuator always need to
use preloaded springs.
Example:
Valve DN 100 with 30 mm rated travel and
1400 cm² actuator with 60 mm rated travel,
0.4 to 2 bar bench range.
1. Set the signal pressure required for
tensioning the springs above the signal
pressure of 1.2 bar (1.2 to 2 bar range)
which corresponds to the mid actuator
travel (30 mm) to 1.6 bar.
2. Thread stem connector nut (6.1) until it
touches the actuator stem.
3. Secure the position with lock nut and at-
tach stem connector as described in sec-
tion 2.1.
4. Enter the 1.6 to 2.4 bar bench range
valid for the mounted valve on the
nameplate of the actuator.
8
EB 8015 EN
Actuator version "Actuator stem retracts"
Note!
The springs in the actuator version "Actuator
stem retracts" cannot be preloaded!
If a valve is to be attached to a larger actua-
tor (rated travel of actuator larger than the
rated travel of the valve), just the first half of
the bench range of the actuator can be
used.
Example:
Valve DN 100 with 30 mm rated travel and
1400 cm² actuator with 60 mm rated travel,
0.4 to 1 bar bench range:
A useable bench range of 0.2 to 0.6 bar is
available for the half valve range.
Caution!
Actuators which have been
preloaded by the manufacturer
without an attached valve are
marked with a label.
In addition, you will notice three
extended bolts on the bottom
diaphragm case. They enable you to
evenly relieve the compressed
springs when disassembling the
actuator.