Thread Content
Installation steps for electric temperature control valve: 1. Inspection upon unboxing before installation: 1. This product has undergone strict testing prior to leaving the factory; nevertheless, it is essential to conduct an inspection before installation. 2. Please verify the quantity and model according to the order and delivery packing list. 3. Please conduct inspections in accordance with the quantities specified above to check for any damage that may have occurred during transportation. II. Installation requirements: Installation location – (1) The valve body of the electric temperature control valve should be installed near the inlet for the hot medium on the primary side. (2) The electric actuator is connected to the valve body. (3) The water outlet/air supply sensor is installed near the outlet of the secondary side. (4) The outdoor temperature compensation sensor (if used) shall be installed in a shaded outdoor area, at a height of ≥2.5m above the ground, and away from doors and windows. (5) The electrical control box and controller are installed in a location near the equipment for easy operation. Effects of improper debugging and installation of electric temperature control valves: Improper selection of the electrical components for such valves as well as incorrect adjustment of their travel position: There are two important parameters related to the electrical components of temperature control valves. ①The opening and closing torque value should include the actual operating torque of the valve plus the valve’s own torque. The magnitude of this torque affects the performance of the valve: too high a torque can lead to damage, while too low a torque can result in leaks. Sufficient margin should be provided in terms of selection and matching (generally, it is required to be 1.1 to 1.3 times the actual operating torque value of the valve). ②The control of the process position is related to factors such as the valve diameter, the duration for which the electric temperature control valve remains open or closed, and its structural design. The motor used in the valve electrical installation is a dedicated motor, designed for short-term operation over a period of 10–15 minutes. High loads during short operating periods can cause the motor to overheat, leading to a decrease in its insulation rating and subsequent damage. The electrical assembly of the self-acting temperature control valve does not match the motor model: the selected motor model does not meet the requirements of the electrical assembly, and there is not enough margin in terms of actual output torque; this can lead to motor damage when operating under overload conditions. Faulty electrical protection and poor quality of electrical components: The microswitch in the valve’s electrical assembly is a key component of the control mechanism; when the valve moves beyond its specified range, the microswitch cuts off the power supply, thereby providing overload protection. Most electrical equipment manufacturers combine travel and torque protection; when the travel limit or torque limit is exceeded, a microswitch promptly cuts off the power supply to the coil of the AC contactor, thereby breaking the main circuit of the motor. Loss of internal temperature control protection in the motor: The motor is equipped with a temperature control switch. When the valve motor is subjected to excessive torque or operates for extended periods, its temperature rises; once it exceeds the set temperature threshold, the temperature control switch immediately cuts off the control circuit, thereby protecting the motor. Improper debugging and installation: ① Valve electrical installations come in two types: horizontal and vertical installation. When the Siemens thermostatic valve is installed vertically, the motor end is at the bottom. When the rubber seal of the wire threading sleeve fails, the lubricating grease in the chamber can enter the motor’s interior through the cable outlet, causing the windings to short-circuit and thus damaging the motor. ②According to JB8528-1997, the rotation direction of the handwheel of the electric actuator should be the same as that of the output shaft: clockwise for closing the valve, and counterclockwise for opening it. If the actual rotation direction of the motor does not match the specified direction, any two phases of the three-phase power supply need to be swapped (by exchanging their positions). Otherwise, inversion will render the protection measures ineffective and cause damage to the motor. ③Since the motors dedicated to valves operate under high load and short-duration conditions. If the continuous debugging time exceeds the specified limit, it may cause the motor to overheat and get damaged.