BEVEL GEAR ACTUATOR
1. DESCRIPTION
For manually operated valves using a bevel gear actua-
tor, the bevel gear is bolted to an actuator mounting
frame, or yoke. The mounting frame is bolted to the
top half of the valve body. The threaded stem passes
through the frame and the bevel gear unit. The threaded
portion of the stem is actuated by a bronze drive nut
inside of the bevel gear. The handwheel or chainwheel is
connected directly to the bevel gear input shaft. In large
line sizes or high pressure applications, a spur gear unit
may be attached to the input shaft, and the handwheel or
chainwheel attached to the spur gear.
2. INSTALLATION
The threaded stem rises through the opening in the
top of the bevel gear. This area must be kept clear of
obstructions. Be sure to open the valve fully before
installing the valve ensure there is sufficient clearance
above the bevel gear for the piston rod to rise.
3. OPERATION
The valve is closed by turning the handwheel clockwise,
and opened by turning the handwheel counterclockwise.
CAUTION: Due to the torque amplifying effect of the
bevel gear, it is possible to overtorque the pinch mecha-
nism, causing damage to the valve.
4. MAINTENANCE
Red Valve Company recommends lubricating the stem
where it is attached to the bevel gear internals every 90
days. The protective cover should be removed and the
valve stem greased liberally with Mobil Mobilith AW 1
or equivalent grease. Be sure to replace the stem cover
securely, or debris could get inside the bevel gear
housing and prevent operation.
The rest of the Dynatorque manual actuator does not
require periodic maintenance. They are lifetime lubricated
with all components designed to have a life equal to or
exceeding the wear life of the gearing. If, for any reason,
lubrication replacement is necessary, Dynatorque recom-
mends replacement with Amoco Amdex No#1 EP or
Exxon Nebula EP1.
5. REMOVAL
To remove the bevel gear unit from the valve, begin by
removing the handwheel or chainwheel by removing the
through bolt that attaches it to the input shaft. Remove all
of the bolts that connect the bevel gear to the mounting
frame. Turn the entire bevel gear counterclockwise. This
will “unscrew” the unit up the piston rod until it can be
removed. Remove the set screw or through bolt that
attaches the handwheel to the input shaft.
2
4
6
5
1
3
1. Bevel Gear
2. Actuator Mounting Frame
3. Threaded Stem
4. Handwheel or Chainwheel
5. Protective Cover
6. Spur Gear (optional)
Page 5 of 8
(Fig. C)
(Fig. C)
