Bench set Flashcards
What are the two mechanical adjustments that need to made when coupling a an actuator?
mechanically adjusting the the stem connector and the spring adjuster.
Why does the stem connector need to be adjusted properly?
the stem connector must be adjusted so neither the actuator nor the valve trim prevents full travel of the valve trim.
What happens when the stem connector is set with the actuator and valve stems spaced too far apart? ( i.e. stem connector length is too long?)
Valve wont fully open
the actuator diaphragm will bind travel at the upper end and the valve plug will bind travel at the lower end.
what happens when the stem connector is set with the actuator and valve stems too closely coupled? (i.e stem connector length is too short)
Valve wont fully close
the actuator diaphragm will bind travel at the lower end and the valve plug will bind travel at the upper end. .