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Maxwell MTC-V is VMD(valve motor drive) output temperature controller, incorporates 3-point stepping valve control feature, two relays, one control the open of the valve, one control the close of the valve, valve position indication, auto/manual control bumpless transfer, works with thermocouple, RTD, and analog inputs,

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● VMD Motorized valve temperature controller, Temperature controller for motorized valve● 2 relay outputs● One relay control valve opening● One relay control valve closing● Auto/manual bumpless transfer● Thermocouple/RTD/Analog input● Valve position feedback● 85~265Vac main source● Modbus RS-485 optional● PV re-transmission optional● C/F display selectable● 0.2%F.S accuracy● Bar graphic to display the valve openness if value with feedbackFurther elaborate on the working principle of this controllerApplication where the objected being controlled like a gas burner etc, the gas flow to the burner via a gas pipe, a valve is installed on the pipe to regulate the amount of gas being released to the burner. and the valve temperature controller(VMD) with motorized output controls the open and close of the valve depends on the difference between the setting value and the process value in the system. below is an image simulate the system and how it works. SP is setting value, the temperature sensor was placed inside of the gas burner,temperature signal is converted to analog signal and feed to the controller. the medium in the pipe could be oil, water etc.