Data Sheet

www.Fisher.com
D500239X012
M Series Manual Handwheel Gear Actuators
for Type A11, A31A and A41 Butterfly Valves
M Series handwheel gear actuators (figure 1) are
totally enclosed, weatherproof, worm gear actuators
for reliable manual operation with Type A11, A31A
and A41 High Performance Butterfly Valves. The M
Series actuator consists of a body housing, cover,
worm gear, input shaft, and handwheel. The housing
is grease-packed.
Note
Neither Emerson, Emerson Process
Management, nor any of their affiliated
entities assumes responsibility for the
selection, use and maintenance of any
product. Responsibility for the
selection, use, and maintenance of any
product remains with the purchaser
and end-user.
Features
D Long Service Life—Rugged construction
provides stability and corrosion resistance. The unit
is totally enclosed for weatherproof operation.
D Accurate Valve Disc Positioning—Two
adjustable stops are located in the housing for
correct adjustment of disc position. The actuator is
inherently self-locking, unless subjected to high
vibration.
D Overtravel Capability—Provides for five
degrees of overtravel in both directions for precise
positioning of the valve disc.
Installation
The M Series gear actuator is normally mounted on
a valve at the factory. However, the actuator can be
field-mounted; it can be mounted in any position on
the Type A11 or A31A and it can be mounted in
positions 1 and 3 on the Type A41, as shown in
figure 2. Make clearance considerations before
mounting the actuator to determine the most suitable
mounting position. Dimensions are shown in figure 3.
W4715-1 / IL
Figure 1. M Series Handwheel Gear Actuator
Product Bulletin
22.2:M
November 2007
M Series Actuators

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