Instruction Manual

5
VALVE T-BOLT RECOM. MAX.
SIZE DIA TORQUE TORQUE
(in) (in) (ft-lbs) (ft-lbs)
30 1 75 120
36 1 75 120
42 1-1/4 75 150
48 1-1/4 75 150
gland and the face of the valve at all points around the
socket.
If a tight connection is not achieved, then the joint
should be disassembled, thoroughly cleaned, and
reassembled. Over-tightening, may cause damage to
the valve or gland.
TABLE 3. MECHANICAL JOINT NUT TORQUES
GEAR OPERATED VALVES: Butterfly Valves are
available with a two types of manual gear actuator.
A worm-gear actuator (Figure 6) has a multi-turn
worm that drives a large sector gear through 90
degrees of rotation. Worm gears provide uniform
motion and torque multiplication throughout the stroke.
A spur gear mounted on the input side provides
additional torque.
FIGURE 6. WORM GEAR ACTUATOR
FIGURE 7. TRAVELING NUT ACTUATOR