Emerson Fisher SS-264 Instruction Manual page 23

Instruction Manual
D103565X012
test, allow additional time to stabilize and retest the leakage rate. If the leakage rate does not meet Class V
requirement, go to step 3.
Note
If Class V leakage was not met in steps a through c above, contact your
3. If seat leakage performance from steps a through c was not met, ensure 50 psig to the air cylinder which will rotate
the ball into the seal and the actuator "closed" travel stop.
4. Loosen the "closed" stop lock nut, then back out the closed travel stop until the rotary encoder indicates the ball
has rotated 0.3° farther into the seal.
Figure 13. Travel Stop
(+)
OPEN TRAVEL STOP
5. While holding the travel stop stationary, securely tighten the "closed" travel stop lock nut using a 1-13/16" wrench.
Torque to 136 N•m (100 ft•lbf).
6. Recheck leakage per steps a through c. Contact your Emerson sales office if Class V cannot be achieved.
Note
Do NOT lap the ball and seal by cycling between each increment in step.
7. Perform steps 3 through 7 for the "open" travel stop of the previous Travel Stop Adjustments section above.
8. To ensure that adequate seating torque (ball seating) is achieved, cycle the valve open and observe the air pressure
of the actuator at the point where the ball begins to move out of the seal.
(-)
¼ Turn = 0.3 degree ball rotation
1 Turn = 1.2 degree ball rotation
A negative (-) turn rotates the ball
away from operator and into the seal
A positive (+) turn rotates the ball
toward the operator and out of the seal
Emerson sales office.
CLOSED TRAVEL STOP
SS-264 Valve
September 2021
(-)
(+)
23