Flowserve HBC Series Limitorque - Manual (Page 6)

Limitorque HBC Series FCD LMENIM3501-02-AQ – 10/14
6
2.4 General Mounting Instructions
a CAUTION: To avoid disengaging the worm gear segment, ensure that the index mark on the drive sleeve (center-
line of gear segment) is oriented to the midpoint of the 90° valve travel. Full stroke rotation of this index mark
should not move past the corresponding travel limit index marks on the housing cover. Should the housing cover
index marks not be visible, the two housing cover bolts (“C” and “D”) can be used for this alignment. Refer to
Figure 2.3.
1. Place the valve in full closed position.
2. Press the splined adapter on valve shaft and insert key (should be a press fit to avoid splined adapter movement
in HBC drive sleeve), or utilize a set screw to eliminate movement of splined adapter on the valve shaft.
3. Remove the pointer cap from HBC gearbox.
4. Turn the HBC gearbox input shaft to full closed position. The stops are preset for 90° travel. Be certain of correct
direction of rotation.
5. Mount the gearbox on the valve and bolt securely. Be sure of gearbox stop alignment before engaging splines.
(See angular displacement tolerances in Table 2.1.)
6. For standard stop setting instructions, see Section 2.5, Setting Position Limit Stops for HBC-0 through -3.
7. For gearboxes with AWWA input shaft stop, see Section 5, Setting Instructions for AWWA Input Shaft Stop.
2.5 Setting Position Limit Stops for HBC-0 through -3
Refer to Figure 2.3.
1. With the valve in full closed position, remove limit stop cover plate.
2. You will note two traveling hex nuts, “A” and “B.”
a. If hex nut “B” is near the position shown, run the hex nut hand-tight against the housing so that one of the
flats of the hex nut is on top, facing the cover plate. (If hex nut “A” is near the opposite end of the limit stop
housing, proceed with Step 4 first.)
b. If hex nut “A” or “B” hits the housing before the valve was tightly closed, back off the hex nut until the valve
is tight and proceed as in Step 2a.
3. Replace the limit stop cover plate and turn the input shaft of the HBC gearbox to fully open the valve.
4. Remove the limit stop cover plate and check the position of hex nut “A.” This nut should be turned until it is
flush up against the end of the limit stop housing and one of the flats of the nut is on top facing the limit stop
housing cover plate.
5. Bolt the limit stop cover plate into position.