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User Instructions
MAN-02-04-60-0352-EN Rev. 3
February 2019
13
Section 5: Installation Instructions
Installation Instructions
Table 1.
Thread Table (1)
Thread
Tightening Torque [Nm] for Bolts with Strength Grade
8.8
A2-70 / A4-70
M6
11
8
M8
25
18
M10
51
36
M12
87
61
M16
214
150
M20
431
294
M30
1489
564
CAUTION: PREVENT ACTUATOR OVERSPEEDING
Valve or piping may be damaged due to high actuating speed.
5.2
Mounting of Linear Fail-Safe Actuator
Emerson Bettis RTS FL Fail-Safe Linear electric actuators move the stem of valve to the
failsafe position in case of failsafe event. In general stem of actuator is at failsafe position at
delivery! epending on valve has to be closed or opened by force (sealing force is required
in Failsafeposition) or by travel (actuator shall stop before touching the seat), mounting
procedure has to be done different:
5.2.1 Mounting procedure for valve without required sealing force:
•
Connect mounting kit to valve and fix according valve producer specification
•
Be sure stem of valve is exact in desired failsafe end position
•
Be sure stem of actuator is in failsafe position: actuator must not be electrically
connected. Handwheel must not be engaged (if applicable, refer to Section 6.2
Manual Operation)
•
Mount actuator to mounting kit and fix with 4 screws
•
Check distance between end of stem of actuator and end of stem of valve:
allowed range of distance is 2 – 25mm
•
Connect both stems with coupling and note symmetrical engagement of
both threads
•
Fix coupling with 4 screws and note both halfs of coupling have to be parallel after
tighten the screws