Flowserve L120-85 Actuator - Manual (Page 13)

(piece 103). This will prevent damaging the Quad Rings (piece 107).
For details refer to Section 10.1, Figure 28.
4.3.3 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 lockwash-
ers 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 units. All four securing bolts are required to retain torque
and/or thrust reaction on these units.
4.3.4 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.
B. Torque and Thrust Applications (Drive 2)
Screw the Thrust Base Assembly onto the Threaded Valve
Stem and secure the Thrust Base Assembly to the Actuator
Mounting Base using Socket Head Cap Screws (piece 110)
and Lockwashers (piece 111).
Figure 4: L120-85 Torque Drive Nut orientation (Drive 1)
Drive 1
Actuator
Mounting
Base
Actuator
Mounting
Adapter
Valve
Stem
#95 Torque
Drive Nut
Key
Note: Key is shown for reference.
It may be in one of several other
orientations in reference to the
actuator.
1
Limitorque L120-85 Installation, Operation and Maintenance FCD LMENIM1202-00 – 11/05
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