1
Part I Machinery configuration and mounting
1. Summary
IMT series un-intrude intelligent multi-turn electric valve actuator (hereinafter referred to as electric actuator) is
used to operate with gate valve, globe valve, diaphragm valve and other valves whose discs make linear movement.
IMT combines with other reducers, so they become a combined multi-turn or quarter-turn electric actuator.
This Operation Manual is prepared for IMT standard type and IMTEx explosion-proof type. For other optional
function, additional instruction will be offered.
2. Major features
2.1 Power supply: 380V, 50Hz, three-phase three-wire sine AC (for other power supply voltage, please let be
informed)
2.2 Enclosure protection: IMT-04
～
2
、
IMT-04
～
2Ex: IP67
（
please let be informed, for IP68
）
IMT-3
～
4: IP65
2.3 Ambient temperature: -20
℃～
+70
℃（
if it exceeds this range, please inform
）
2.4 Ambient humidity: < 90%
（
at 25
℃）
2.5 Altitude: < 1000m
2.6 Short-time duty: Rated time 10
、
15
、
30 min
（
according to the motor’s actual loading
）
2.7 Without strong vibration.
2.8 Without strong corrosive material and explosive mixed gas.
2.9 Set-up methods: local selector switches, remote setter (please inform if remote setter is needed)
3. Main structure
Major components of electric actuator:
3.1 Valve special used motor: It conforms to valve’s loading performance and working condition. With a big
start-up torque, small rotational inertia and short-time duty.
3.2 Reducer: it is composed of first-class gear pair and first-class worm gear pair. It is used to transmit and enlarge
the input power of motor. Every seating No. of IMT and IMTEx series has 3-5 kinds of speed ratios for worm gear
pair, and numerous speed ratios for gear pair. Thus, it owns a practical output rotation speed range.
3.3 Output shaft (driving hollow shaft): it is the power-output component of electric actuator. Both jaw type and
valve stem nut type can be provided. The internal thread is usually processed by user. The type of the output shaft is
decided by user when ordering.
3.4 Manual-electric switching handwheel: it is used to switch manual operation between electric operation. It is
semi-automatic, electric-operation priority. Press the handle according to the arrow before manually operating;
gently turn the handwheel until the switching handle is finally rotated at the right place. Manual-electric switching
job is finished and manual operation starts. While it is electrically operated, switch the handle to the electric
operation position and it starts to work electrically.
(Note: it is forbidden to forcefully turn switching handle from manual operation position to
electric operation position, otherwise actuator would be damaged.)
3.5 Manual operation mechanism (handwheel): use handwheel after manual-electric switching is finished. The
handwheel of IMT-04
～
03(IMT-04
～
03Ex) is on the top of the actuator, so it directly drives the output shaft during
manual operation. The handwheel of IMT-00
～
2(IMT
～
2Ex)
、
IMT-3
～
4 is on the side of the actuator, so the
handwheel directly drives output shaft through worm gear pair.
3.6 Torque control mechanism: it controls output torque and protects electric actuator from over-loading and being
jammed.
The working schematic for IMT series output torque: axial force from worm gear acts on Belleville spring, and it
drives torque switch to finish torque control. User is forbidden to adjust the torque value which is locked and
required by user before factory delivery.
3.7 Limit control mechanism: it is used to precisely control valve’s end position and used to feedback valve position
