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ML6425, ML7425 Spring Return
Electric Linear Valve Actuators
PRODUCT DATA
FEATURES
ML6425 and ML7425
• Accurate valve positioning.
• Quick and easy installation.
• No separate linkage required.
• On power failure:
ML6425A and ML7425A drive valve stem down.
ML6425B and ML7425B draw valve stem up.
• Conduit connector is standard.
• No adjustments required.
• True spring return on power failure.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
• Direct/reverse acti
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ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS SPECIFICATIONS Models: Storage: -40° to +158° F (-40° to +70° C). Maximum Valve Medium: 300° F (149° C). Model Spring Return Action Description ML6425A Drive valve stem down on power Electric Humidity: 5 to 95 percent relative humidity, noncondensing. failure Linear Valve ML7425A Actuator Close-off Pressure Ratings: Refer to Table 1. ML6425B Draw valve stem up on power failure Protection Standard: IP54. ML7425B Approvals: Dimensions:
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ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS Table 1. Close-off Ratings for ML6425, ML7425 Electric Linear Valve Actuators and Honeywell Valves (psi). Type Valve 1/2 in. 3/4 in. 1 in. 1-1/4 in. 1-1/2 in. 2 in. 2-1/2 in. 3 in. FlangeV5011A — ———— —28 16 V3350/ 3351/ 3450/ 3451 — ———— —21 14 a a V5013B, C; V3360/ 3361/ 3460/ 3461 — ———— — 21 14 b b b b NPT V5011F, G 77 49 28 16 150 150 134 150 V5011H, J 150 150 150 145 — — — — V5011N1xxx, V5011N3xxx, V5013N 230 230 163 104 67 37 —
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ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS M6629 Fig. 5. Removing Spring Retaining Clip and Releasing Manual Spring Handle. M6632 Fig. 2. Attaching Actuator to Valve Collar. WIRING CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. All wiring must comply with local electrical codes, ordinances and regulations. Voltage and frequency of the transformer used with the actuator must
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ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS ML6425A,B WIRING T6984 (FLOATING CONTROLLER) ML7425 4 2 STRIP WIRING MOTOR OPEN 2 B STRIP MOTOR CLOSE INPUT F W F (FEEDBACK) 24 Vac OUTPUT + + COMMON – 3 – T2 T1 T5 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS T1 O1 AND OVERLOAD PROTECTION AS REQUIRED. O2 2 ALL WIRING BLOCKS HAVE THE SAME TS NUMBER OF TERMINALS (8), BUT THE ONLY 1 TERMINALS THAT ARE ACTIVE ON THIS 3 T L1 BLOCK ARE T1, T5, W, AND B. (HOT) Y 3 THE T-Y-G TERMINALS ARE
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ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS SENSOR ML7425 ML7425 SENSOR WIRING WIRING 1 2 3 4 5 6 1 2 3 4 5 6 STRIP STRIP 1 1 F L1 F L1 (HOT) + (HOT) + L2 L2 – – SINGLE SINGLE TRANSFORMER T2 T2 TRANSFORMER 3 2 1 2 1 40 VA 24 VAC 3 T1 40 VA 24 VAC T1 O1 O1 500 OHM O2 RESISTOR O2 T775 T775 (WITH 2-10 VDC OUTPUT) TS TS (WITH 4-20 MA OUTPUT) 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS M7895 AND OVERLOAD PROTECTION AS REQUIRED. M7897 AND O
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ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS ML7425 W3 W2 W1 Signal Input (+) The analog input signal (+) range is set at the factory to 0 to 10 Vdc. Changing the position of the W2 selector plug sets the 0% 50% 100% range to 2 through 10 Vdc. Selector plugs W1, W2, and W3 are positioned on the back side of the printed circuit board. Refer to Fig. 15 for location of the selector plugs. Signal Input Failure Using the potentiometer, the actuator can be set to run to any positi
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ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS up on decreasing signal. When the valve stem is up, the Direction of Action (ML7420/ML7425 only) output signal from the feedback (F) function is 0 or 2 Vdc. The The direction of actuator action can be changed using the output of the signal does not change when W3 is used to pushbutton and LED, which is factory set so that the actuator reverse the action of the actuator (see Fig. 15). drives the valve stem down on increasing signal
