Flowserve PT Series Limitorque - Manual (Page 7)

7
Limitorque PT Series Worm Gear Operator FCD LMENIM2001-00 – 01/10
flowserve.com
2.4 General Mounting Instructions
a CaUTIOn: To avoid the potential for disengaging the worm gear segment, ensure that the pointer cap pointer is
oriented to the mid-point of the 90º valve travel. Full stroke rotation of the quadrant should not move the pointer
past the corresponding Open or Close ID marks on the housing cover.
1. Place valve in full closed position.
2. Remove the pointer cap from the PT operator. Refer to Section 4 for removal/replacement instructions for the
pointer cap.
3. PT12/14/30/40/50/60/75/120/150 – Slide the splined adapter onto the valve shaft and insert the key. Splined
adapters include machining for a setscrew to eliminate movement of the splined adapter on the valve shaft.
4. Confirm operator stop alignment before engaging splines. Mount operator on valve and bolt securely.
5. PT65/120/150 – Remove the splined adapter from the PT and mount the PT to the valve. Align the valve shaft with
the bore and key of the splined adapter. Using either the PT or electric actuator handwheel, rotate the PT drive
sleeve to align the drive sleeve’s splines with the splined adapter. Slide the splined adapter down onto the valve
stem and into the drive sleeve of the PT.
nOTE: Blank splined adapters are not machines for set screws.
6. PT250/500/1000 – Stem adapters are bolted into place from the top of the PT. Remove the torque nut and align
the valve drive stem with the bore and key of the torque nut. Slide the torque nut onto the valve stem. Using either
the PT or electric actuator handwheel, rotate the PT drive sleeve to align the drive sleeve’s threaded holes with the
torque nut’s through holes. Bolt the torque nut into position. Preload properly class 8.8 fasteners, securing torque
nut as follows at installation. (Preload is not set at factory.)
Table 2.1 – Stem Adapter Bolt Torques
Unit Size ft-lb n m
PT250 475 640
PT500 700 950
PT1000 1,200 1,620
Fasteners that are stainless steel or other than property class 8.8 require different preload torque than listed above.
Consult factory.
7. Turn PT operator input shaft to full closed position. The stops are preset for 90º travel. Be certain of correct direc-
tion of rotation.