Val-Matic Rubber-Seated Ball Valve - Manual (Page 7)

7
INSTALLATION (Cont'd)
GEAR OPERATED VALVES: Ball Valves are provided
with traveling-nut actuators. A traveling nut actuator
(Figure 6) has a threaded rod (14) that drives a nut
(12) from one end of the housing (1) to another. The
traveling nut in turn drives a slotted lever through 90
degrees of rotation. Traveling nut actuators provide
slower rotation and greater torque multiplication at the
ends of travel. A bevel gear mounted on the input side
of the actuator provides additional torque on larger
units (Figure 7).
FIGURE 6. LS1A-LS4A ACTUATOR
These actuators are self-locking and multiply the
turning force on the handwheel or nut so that valves
can be operated with ease. A clamp-on chainwheel kit
can also be used for installations high above the floor.
An indicator on the top of the actuator housing
indicates the position of the valve ball. The handwheel
or nut must be rotated through 15-579 turns
(depending on model) to open or close the ball valve.
The direction of rotation to open the valve is indicated
on the 2" square actuator nut and handwheel. The
standard direction of rotation is open left or counter-
clockwise to open. Nuts with opposite rotation (open
right) will be painted red to indicate their special
rotation.
GEAR ACTUATOR ADJUSTMENT: The standard
actuator is provided with factory-set open and closed
position stops to properly center the closed ball seal in
the body seat. No field adjustment is necessary.
FIGURE 7. LS5A-LS7A ACTUATOR