Manufacturer: Nippon Gear Co., Ltd.
Model: SMB Series

Features

• • Single-touch switching between manual mode and electric mode

    • Operating the declutch lever switches to the manual mode, and activating the motor restores to the electric mode automatically.
    • The auto-declutching function (SMB-0 and higher, option) that switches to the manual mode by turning the hand wheel is also available. (If the auto-declutching function is available, activating the motor also restores to the electric mode automatically.)

    • High-performance torque switch

      • The operating point of the torque switch can be set to any value. It protects the valve and drive mechanism from an overload in both the opening and closing directions without fail.
      • The rotary type equipped with the 1a and 1b contacts in both the opening and closing directions and the open type equipped with the 1b contact in both the opening and closing directions are available.
      • 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.

        Easy maintenance

        • The stem nut has a dual (two-piece) structure. The drive sleeve and stem nut are detachable because they are engaged with a spline.
        • When replacing the stem nut, the actuator and electric wire do not need to be removed.
        • Because the motor and worm gear have independent structures, the self-locking feature prevents the valve from operating under its own weight even with the motor dismounted, if the worm has one tooth. (In the case of SMB-000,00, the self-locking feature is canceled when switched to manual mode.)

        • High-precision geared limit switch

          • The operating point can be set at any position within the entire stroke.
          • The limit switch is operated by the intermittent gear without fail. The preset position does not shift.
          • Various contact types ranging from 2-line 8-contact to 4-line 16-contact (option) can be selected according to the application.
            

            Optimized motor

            • This product is equipped with a strong torque motor that is specially designed for driving the valve as standard. Because this product is the low inertia type, the shock generated at the time of a stop is small, and braking is not required at normal opening and closing speeds.
            • This product can be selected from among various sizes, according to the load.
            • Air, gas, oil, and servomotors can also be designated according to the protection type and power source.

          • Highly-durable gear train

            • Worm gears and worms are made of aluminum bronze and carbon steel or chrome molybdenum steel, respectively. They can withstand high output and loads and maintain superior performance over a long period of time.
            • Optimum materials are used for the respective gears according to the loads, and extreme pressure grease is filled in the sealed gear case.
            • Ball bearing is used. A taper roller bearing is used for the output shaft that receives thrusts to realize stability-oriented design.

            Specifications

            Unit size				SMB-000	SMB-00	SMB-0	SMB-1	SMB-2	SMB-3	SMB-4	SMB-5T
            Mechanism and specifications	Allowable torque N・m			170	360	1000	1500	2700	6100	11500	27500
            	Allowable thrust kN			30	62	105	200	320	620	1100	–
            	Minimum and maximum stem diameter*1（mm）	Exterior thread	2PC	32以下	20-46	24-60	38-73	42-86	55-127	60-127	–
            		Interior thread	2PC Maximum keyway	25以下 8×3.3	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	–
            			1PC Maximum keyway	25-30 8×3.3	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	230 50×11.4
            	Output shaft rotation frequency(min-1)*4	60Hz	30 minutes (20 %) rating	17.0-51.0	15.6-73.8	17.2-62.6	19.2-62.5	20.6-72.8	16.4-47.4	13.6-32.8	7.4-16.3
            			15 minutes (40 %) rating	16.0-48.0	14.7-69.5	16.2-59.0	18.1-58.8	19.4-68.6	15.4-44.6	12.8-30.9	7.0-15.3
            		50Hz	30 minutes (20 %) rating	14.0-42.0	12.8-60.8	14.2-51.6	15.8-51.5	17.0-60.0	13.5-39.0	11.2-27.0	6.1-13.4
            			15 minutes (40 %) rating	13.5-40.5	12.4-58.6	13.7-49.7	15.3-49.6	16.4-57.8	13.0-37.6	10.8-26.1	5.9-13.0
            	Standard reduction rate of manual type			2.86 (Option)	4.38	21.71	25.23	22.30	28.38	33.69	269.8
            	Attachable motor number*5			#2 #5	#5 #7.5 #10 #15*2	#7.5 #10 #15 #25*2	#15 #25 #40*2	#40 #60	#60 #80 #100 #150*3	#100 #150 #200	#150 #200 #250 #350
            	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	Torque switch			1a and 1b in both opening and closing directions (rotary type)
            	Geared limit switch			4 contacts (2a, 2b) × 2 lines (standard)
            	Motor	Power supply		“200 V AC class, 400 V AC class/50 Hz, 60 Hz 100 V DC class, 200 V DC class”
            		Heat resistance class		Class E (standard), class B, class F, and class H (option)
            		Rated time		15 minutes or 30 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), water resistant type (IP67)
            	Explosion-proof structureExplosion-proof structure			Pressure-resistant explosion-proof structure (such as d2G4 and d3aG4) Increased-safety explosion-proof structure (such as ed2G3 and ed3aG3)