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Outline
The Limitorque JMB Series valve actuators, developed based on the proven SMB series, are designed for water supply and sewerage applications as well as heavy industrial use.
– Equipped with an interlock switch that interrupts the electric circuit during manual operation for enhanced safety.
– Built with robust structure, high accuracy, and advanced control mechanisms.
– Superior maintainability ensures stable and long-term operation.
– Available in eight unit sizes with a wide range of reduction ratios.
Application
– Water supply and sewerage systems.
– Thermal and hydropower plants.
– Petroleum, chemical, shipbuilding, marine, and papermaking industries.
– Direct mounting on multi-turn valves (hydraulic gates, gate valves, globe valves, sluice gates).
– Compatible with part-turn valves (butterfly, plug, dampers) when combined with part-turn actuators.
Features
Safe electric/manual switching
– JMB-00 and larger: pulling the handwheel switches to manual mode, pushing it restores electric mode.
– JMB-04 and JMB-03: equipped with declutch lever for switching between modes.
– Standard interlock switch prevents electric operation during manual mode, ensuring accident prevention.
High-precision geared limit switch
– Operating point adjustable across the full stroke.
– Driven by intermittent gear with no shift in preset position.
– Options: from 2-line 8-contact up to 4-line 16-contact.
High-performance torque switch
– Adjustable for both opening and closing directions.
– Protects valves and drive mechanism from overloads.
– Available in rotary type (1a/1b contacts), open type (1b), and microswitch type (1c).
Operation mechanism
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Motor drives the worm gear via helical gear and worm.
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Stem nut, engaged with valve stem screw, moves the valve stem to open/close.
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Worm compresses torque spring proportionally to torque increase, rotating the torque switch.
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At preset torque, the torque switch opens, stopping the motor.
Enhanced control functions
– Integral control for control panels and computerized systems.
– Enables centralized and networked actuator systems.
Highly durable gear train
– Worm gears (aluminum bronze) + worms (carbon steel or chrome molybdenum steel).
– Sealed with extreme pressure grease.
– Bearings (ball + taper roller) for stable and high-load performance.
Earth terminal and space heater (standard)
– Standard equipment across all models.
– Supports use in humid and cold environments.
Easy maintenance
– Dual stem nut structure, detachable via spline connection.
– Stem nut replacement does not require actuator/wiring removal.
– Independent motor and worm gear structures ensure self-locking, preventing unintended valve movement.
– Manual operation possible even with motor dismounted (standard gear ratio).
Benefits
– Proven SMB-based reliability, adapted for water-related applications.
– Built-in safety interlock for accident-free manual operation.
– Long service life with high durability gear train and sealed design.
– Flexible applications across both multi-turn and part-turn valves.
– Simplified maintenance and centralized control capability.
Specifications
| Unit size | JMB-04 | JMB-03 | JMB-00 | JMB-0 | JMB-1 | JMB-2 | JMB-3 | JMB-4 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mechanism and specifications | Allowable torque N・m | 110 | 250 | 360 | 1000 | 1500 | 2700 | 6100 | 11500 | ||
| Allowable thrust kN | 35 | 49 | 62 | 105 | 200 | 320 | 620 | 1100 | |||
| Minimum and maximum stem diameter*1 （mm） |
Exterior thread | 2PC | 26以下 | 38以下 | 20-46 | 24-60 | 38-73 | 42-86 | 55-127 | 60-127 | |
| 1PC | ー | 45-51 | 60-70 | 73-83 | 86-98 | 127-146 | 127-171 | ||||
| Interior thread | 2PC Maximum keyway |
20以下 6×2.8 |
32以下 10×3.3 |
20-36 10×3.3 |
25-47 14×3.8 |
30-60 18×4.4 |
35-70 20×4.9 |
35-100 28×6.4 |
45-110 28×6.4 |
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| 1PC Maximum keyway |
25以下 8×3.3 |
38以下 10×3.3 |
25-44 12×3.3 |
35-58 16×4.3 |
45-67 20×4.9 |
50-80 22×5.4 |
70-120 32×7.4 |
90-152 40×9.4 |
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| Output shaft rotation frequency(min-1)*2 (Standard reduction rate of electric type) |
60Hz | 15.1-48.3 | 15.4-49.4 | 14.7-69.5 | 16.2-59.0 | 18.1-58.8 | 19.4-68.6 | 15.4-44.6 | 12.8-30.9 | ||
| 50Hz | 12.7-40.8 | 13.0-41.7 | 12.4-58.6 | 13.7-49.7 | 15.3-49.6 | 16.4-57.8 | 13.0-37.6 | 10.8-26.1 | |||
| Reduction rate of manual type | JMB model (standard) | ー | 45 | 38 | 34 | 33 | <41/td> | 49 | |||
| JMB-H model (equipped with HWA)*3 | ー | 38×3.2 | 34×3.6 | 33×3.9 | 41×5.5 | 49×6.75 | |||||
| Attachable motor(kW) | 0.2 0.4 |
0.2 0.4 |
0.4 0.75 1.5 |
0.75 1.5 2.2 |
1.5 2.2 3.7 |
3.7 5.5 |
5.5 7.5 11.0 15.0 |
11.0 15.0 18.5 22.0 |
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| 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) |
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| Electric and control specifications | Torque switch | JMB-04, 03: 1c in both opening and closing directions (microswitch type) JMB-00 to 4: 1a and 1b in both opening and closing directions (Rotary type) |
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| Geared limit switch | JMB-04, 03: 2 contacts (1a, 1b) x 2 lines (standard) JMB-00 to 4: 4 contacts (2a, 2b) x 2 lines (standard) |
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| Motor | Power supply | 200 V AC class, 400 V AC class/50Hz, 60Hz 100 V DC class, 200 V DC class |
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| Insulation class | Class E (standard), class B, and class H (option) | ||||||||||
| Rated time | 30 minutes or 15 minutes (standard) | ||||||||||
| Space heater | Option | ||||||||||
| Indication light | Option | ||||||||||
| Push-button switch | |||||||||||
| Position transmitter | |||||||||||
| Electromagnetic switch | |||||||||||
| Proportional braking system | |||||||||||
| Others | |||||||||||
| Protection type | Protection structure | Standard(IP55) | |||||||||
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