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ML6421, ML7421
Non-Spring Return
Electric Linear Valve Actuators
PRODUCT DATA
FEATURES
Quick and easy installation.
No separate linkage required.
3/4 in. (20 mm) stroke on ML6421A and ML7421A.
1-1/2 in. (38 mm) stroke on ML6421B and ML7421B.
No adjustments required.
Accurate valve positioning.
Low power consumption.
Selectable 0(2) to 10 Vdc or 0(4) to 20 mA input signal
with ML7421.
Position feedback with ML7421.
High close-off ratings.
Direct/reverse acting with ML7421.
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ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS SPECIFICATIONS Models: Close-off Pressure Ratings: See Table 1. Cable Entry: Two knockout holes for 1/2 in. conduit standard Stroke in Run Time in on actuator case. Model in. (mm) sec at 60 Hz Description ML6421A 3/4 (20) 95 Electric Linear Ambient Ratings: Valve Actuator Temperature: ML7421A Ambient Range: 14°F to 122°F (-10°C to +50°C). ML6421B 1-1/2 (38) 175 Storage Range: -40°F to +158°F (-40°C to +70°C). Humidity Range: 5
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ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS ML6421A,ML7421A ML6421B, ML7421B 7 (178 ) X 7 (178) 7 (178 ) X 7 (178) 2-1/2 2-1/2 (64) (64) 16-7/8 14-1/4 (430) (360) MINIMUM MINIMUM CLEARANCE CLEARANCE 12-3/4 10-3/8 (326) (264) KNOCKOUTS KNOCKOUTS (2) 9-3/8 (2) 7/8 (22) (239) 7/8 (22) 11-7/8 (301) 5-5/8 (142) 8 (204) YOKE DIAMETER 1-3/8 (35) M17430 YOKE DIAMETER 1-7/8 (48) Fig. 1. Approximate dimensions of ML6421, ML7421 Electric Linear Valve Actuators in in. (mm). INSTALLAT
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ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS Mounting Wiring 1. Place the actuator on the valve with the U-bolt around the valve collar. See Fig. 2. CAUTION IMPORTANT Electrical Shock or Equipment Damage Hazard. When tightening the set screws, first tighten the right Can shock individuals or short equipment set screw. See Fig. 2. circuitry. Disconnect power supply before installation. 2. Place the U-bolt against the valve collar and secure the actuator to the valve by tur
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ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS ML6421A,B WIRING ML7421 SENSOR STRIP 2 WIRING 1 2 3 4 5 6 STRIP L1 T1 (HOT) T1 T2 W L2 1 L1 R T2 (HOT) B + L2 SPDT 1 O1 SINGLE W CONTROLLER 3 2 1 TRANSFORMER O2 B 40 VA, 24 VAC 1 POWER SUPPLY. PROVIDE DISCONNET MEANS AND OVERLOAD PROTECTION AS REQUIRED. T775 (WITH 2 TO 10 VDC OUTPUT) 2 ALL WIRING BLOCKS HAVE THE SAME NUMBER OF TERMINALS (8), BUT THE ONLY TERMINALS 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS THAT ARE ACTIVE ON T
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ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS OPERATION General ML7421 The drive of the actuator synchronous motor is converted into the linear motion of the actuator stem by using a worm gear Signal Input Failure transmission. A button retainer clip connects the actuator Using selector plug W1, the actuator can be set to run to one stem to the valve stem. of three positions in event of a signal failure: 0%: Actuator position corresponds with 0 or 2 Vdc signal. The inter
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ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS Actuator Override ML7421 To override the control signal (for freeze protection or similar WIRING applications), connect the 24 Vac common (T2) to either 2 STRIP terminal O1 or O2. Connecting to terminal O1 fully extends INPUT F F the actuator stem. Connecting to O2 fully retracts the actuator (FEEDBACK) OUTPUT + + stem. 3 – – The control signal (+) is ignored when the override signal is T2 applied to terminal O1 or O2. This ov
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Automation and Control Solutions Honeywell International Honeywell Europe S.A. Honeywell Latin American Honeywell Honeywell Limited-Honeywell Limitée Control Products 3 Avenue du Bourget Region 1985 Douglas Drive North 35 Dynamic Drive Honeywell Building 1140 Brussels 480 Sawgrass Corporate Parkway Golden Valley, MN 55422 Scarborough, Ontario 17 Changi Business Park Central 1 Belgium Suite 200 M1V 4Z9 Singapore 486073 Sunrise FL 33325 Printed in U.S.A. on recycled 63-25154 B.B. Re
