Flowserve MX Electronic Actuator - Manual (Page 15)

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Limitorque MX Electronic Actuator FCD LMENIM2306-06 – 10/13
flowserve.com
3
Installation and Operation
3.1 Preparing the Stem Nut
The MX has two (2) basic base designs:
• Torque-only base, designated by a “B” prefix
• Thrust-only base, designated by an “A” prefix
3.1.1 Type “B” Bases: Torque-only Applications
Standard B4/B4E Base
The standard MX actuator base is the B4 torque-only. It includes a mounting plate and steel torque nut, which may
be machined to fit a valve or gearbox. A B4E torque nut can be provided and may be installed to allow for extended
stem acceptance.
NOTE: Some MX actuators are supplied with single piece drive sleeves that have been bored and keyed. These are
typically mounted directly to gearboxes. The MX actuator maybe mounted in any position as long as the handwheel
is accessible.
Figure 3.1 – B4 base