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Limitorque L120-85 Installation, Operation and Maintenance FCD LMENIM1202-03-A4 – 06/15
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A) If the Thrust Base Drive Sleeve (piece 101) has been threaded by supplier, verify thread compatibility with the threaded Valve Stem by
screwing Drive Sleeve onto the valve stem.
B) If Thrust Base Drive Sleeve (piece 101) has not been threaded by supplier, it is provided solid (blank) to allow customer to custom thread.
Maximum threaded stem diameter is 3.25” (82.5 mm).
NOTE:
If Thrust Base disassembly is required in order to thread blank Thrust Base Drive Sleeve, remove Quad Rings (piece 107) before
removing Thrust Washer (piece 104) and Thrust Bearing (piece 103). This will prevent damaging the Quad Rings (piece 107). For
details refer to Section 10.1, Figure 28.
4.1.3 Mounting Bolts
Mount the L120-85 actuator on the Actuator Mounting Adapter (Drive 1) or on the Thrust Base Assembly (Drive 2). High-strength
(minimum hex head SAE-Grade 5 or ISO Metric Class socket head cap screws) 8.8 hex head or socket head cap screws with lockwashers
are recommended. The quantity and thread size of the actuator mounting taps are as follows:
Table 3: L120-85 Actuator/Mounting Base Tap Size
Unit Type
Quantity
Tap Size
Drive 1 and 2
English
4
3/4–10 Tap x 1.0 in. Deep*
Metric
4
M20 x 2.5 mm x 10 mm Deep*
*Complies with F16 IOS mounting flange criteria
NOTE:
Limitorque has supplied four taps for the L120-85 English and metric actuators. All four securing bolts are required to retain
torque and/or thrust reaction on these actuators.
4.1.4 Stem Cover for Rising Stem Applications
a
CAUTION:
Selection and installation of a stem cover which is too short will result in damage to the valve and/or actuator.
a
CAUTION:
Be sure to complete each step of the installation overview before electrically operating your actuator. If your actuator is
already mounted to a valve or other actuated device from the manufacturer, verify that the actuator is mounted according to the
following overview. Failure to follow the installation procedures could result in personal injury or may allow the actuator to operate
improperly and could cause damage to your equipment.
a
CAUTION:
Ensure Retaining Ring (piece 98) is properly engaged in the Drive Sleeve (piece 25) to secure the Torque Drive Nut
(piece 95) in place. If the Torque Drive Nut is not properly secured, it may fall from the bottom of the actuator when removed from
customer mounting adapters.
Before putting your actuator into operational service, check the height of your valve stem at the full OPEN position and mount a suitable
stem cover to protect the valve stems and to prevent water entry into the actuator.
Installation Overview
1. Applications
A. Torque Only Applications (Drive 1)
Mount Torque Drive Nut (piece 95) in the actuator with the Torque Drive Nut axially aligned on the Drive Sleeve (piece 25) so that
the bottom of the nut is positioned inside the actuator Mounting Base. Secure Torque Drive Nut inside Drive Sleeve (piece 25) with
Retaining Ring (piece 98). Refer to Figure 27.
