Bench set

Question 1

What are the two mechanical adjustments that need to made when coupling a an actuator?

Answer 1

mechanically adjusting the the stem connector and the spring adjuster.

Question 2

Why does the stem connector need to be adjusted properly?

Answer 2

the stem connector must be adjusted so neither the actuator nor the valve trim prevents full travel of the valve trim.

Question 3

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?)

Answer 3

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.

Question 4

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)

Answer 4

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. .