Val-Matic 30 and Larger Butterfly Valve With LSA Actuator and External Stops User Manual
Page 6
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