NIPPON GEAR

NIPPON GEAR

Valve actuator

L120 series

Outline

Wide-range for processes

Limitorque valve control
L120 series

The Limitorque L120 series offers multi-turn-type valve actuators equipped with a motor and gear train.
In addition to the robust and highly accurate structures and enhanced control mechanism, the design with superior maintainability guarantees stable operation for a long time. To meet the demands of a wide range of fields, we offer eight unit sizes and protection types, such as waterproof and explosion-proof types.

Application

  • – Thermal and hydropower plants, water supply and sewerage systems, petroleum oil, chemical, ship, vessel, and papermaking.
  • – L120 actuators can be attached directly to multi-turn-type valves (such as gate valves, glove valves, through gates, and hydraulic gates).
  • – They can be attached to part-turn-type valves (such as butterfly valves, plug valves, and dampers) in combination with an actuator for part turn-type valves.

Features

  • Robust housing

    • – Die-cast aluminum is used for small-sized standard housings, and cast iron is used for large-sized standard housings.
    • – The housing with standard specifications is the outdoor type (IP55), but we can also offer water-resistant and explosion-proof types to meet the needs of customers.
    • – The O-ring with a large wire diameter maintains high air-tightness over a long period of time.
  • Highly-durable gear train

    • – The worm gears and worms are made of aluminum bronze and chrome molybdenum steel, respectively. They enable the drive sleeve to have a long life of over 100,000 rotations.
    • – Optimum materials are used for the respective gears according to the loads, and extreme pressure grease is filled in the sealed gear case.
  • High-performance torque switch

    • – It has high-capacity silver contacts with long life.
    • – The operating point can be set within the entire torque range in both the opening and closing directions.
      The valve is protected from overloads without fail.
  • High-precision geared limit switch

    • – All units are equipped with a four-position geared limit switch with a rated voltage of 600 V as standard.
    • – Four rotors have four contacts, respectively, to detect the four valve positions.
    • – The operating point can be set at any position within the entire stroke.
    • – The switch rotor is operated by the closed metallic intermittent gear lubricated with grease without fail. The preset position does not shift.
  • High-safety electric/manual mode switching operation

    • – All models are equipped with the declutch lever as standard. Switching the lever to manual mode position enables manual operation.
    • – When the motor rotates, the lever restores automatically, the electric operation mode is turned on, and the hand wheel does not rotate.
  • Equipped with the earth terminal/space heater as standard

    • – All models are equipped with the earth terminal for responding to highly humid and wet environments, as well as a space heater for stabilizing operation in low-temperature environments as standard. They can be used in a wide variety of fields.
  • Enhanced control functions

    • – Integral control, consisting of various control devices, is applicable to the control station (control panel) and computerized control.
    • – It enables development into a centralized system that networks multiple actuators.

Specifications

Unit size L120-10 L120-20 L120-40 L120-85 L120-190 L120-420 L120-800 L120-2000
Mechanism and specifications Allowable torque N・m 140 270 540 1100 2500 5700 11000 27000
Allowable thrust kN 44 88 130 200 330 620 1100 2200
Maximum system diameter mm Screw connection
Drive 2
※32 ※57 ※66 ※83 ※88 ※127 ※127 ※158
Key connection
※※Drive 1
24
(7×3 )
46
(14×3.8 )
53
(16×4.3 )
70
(20×4.9 )
73
(20×4.9 )
108
(28×6.4 )
180
(45×10.4 )
206
(50×11.4 )
Output shaft rotation frequency min-1 60Hz 12-192 12-192 12-192 12-192 12
18-96
120-192
12
18-72
84-168
12-36
84-192
12-30
36-60
50Hz 12-168 12-168 12-168 12-168 12-18
24-84
96-168
12-18
24-60
72-168
12-60
72-144
12-30
36-48
Reduction rate of manual type Standard 1:1 1:1 1:1 ※※※ 40:1
24:1
9:1
39:1
28:1
11:1
34:1
13:1
270:1
164:1
Option 4.2:1 5.7:1 12:1 115:1
69:1
26:1
236:1
170:1
67:1
202:1
79:1
772:1
468:1
Attachable actuator BA(Allowable thrust: 26 – 1,200 kN, for multi-turn-type valve)
HB(Allowable torque: 0.83 – 200 kN·m, for part-turn-type valve)
H(Allowable torque: 390 – 1,100 kN·m, for part-turn-type valve)
Electric and control specifications Motor Power supply AC 200V/400V/50Hz、200V/440V/60Hz(Compatible to 600 V AC and lower)
Starting torque 500%
Insulation class Class F
Rated time 15 minutes
Thermostat 15 minutes
Space heater Supplied
Thermal protector Option
Motor starter Option
Trans
Push-button switch
Indication light
Selector switch
Position transmitter
Modulating control
Protection type Protection structure IP55,67、NEMA,I,Ⅱ,Ⅳ,Ⅵ
Explosion-proof JIS Exdll BT4
FM Class 1 Group B,C,D Division 1,2
FM Class 2 Group E,F,G Division 1,2
CSA Class 1 Group B Division 2
CSA Class 1 Group C,D Division 1,2
CSA Class 2 Group E,G Division 1,2
Cenelec Group 2a,2b T4(BS 5501 PART 5 )

*Represents the screw connection with a thrust base.
**Represents the key connection and the value in parenthesis is the maximum keyway dimension.
***Same as the reduction ratio of the unit.
The L120-85 and higher models are manufactured by Flowserve Corporation in the United States.

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