Marwin Valve UT Series Pneumatic Actuators - Manual (Page 6)

3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.marwinvalve.com Bulletin IM-UT(pre2003design)-1211
Stroke Adjustment
Closed
 Adjust closed position of valve by loosening bracket bolts, twisting actuator slightly, and retightening bolts.
Repeat until desired closed adjustment is reached.
Open
Adjusting the stop bolts reduces or increases the piston stroke and opening rotation
 Remove air supply or move the pistons to the closed position.
 Adjust one bolt only. Back off and leave second bolt until after desired open adjustment is reached.
 Move the pistons to the open position and verify the new adjustment.
 Repeat this operation until desired open adjustment is achieved.
 Restore air supply, and adjust the second bolt until it touches the piston.
2003 versus Pre-2003 Design
Pre 2003 Design
UT-0 Shown
Representative of:
 All UT actuators 0A thru 7 (32-270mm bore) prior to 2003
 UT-0A, and UT-5 thru 7 (32 & 160-270mm bore) only after 2003
2003 Design
UT-0 Shown
Representative of:
 UT Actuators 0 thru 4.5 (52-140mm bore) after 2003
STOP
IN AIR