How to buy electric valve

The type of valve motor protection grade low: electrical equipment sets of valve-specific motor for the full closed squirrel-cage layout, short-term intermittent system (10 min) self-cooling. According to GB 4942. 1 - 85 requirements, the lowest protective grade IP44, the highest protective grade IP68. Valves use conditions and conditions such as differences, the level of protection required is also different. Low level of protection will cause the inner cavity of the motor to damp or invade with dust and other foreign matters, and the motor insulation resistance will drop to cause damage. Packaging, transportation and storage is not appropriate: electrical valve packaging should be rain, moisture, dust steps, the packaging should be solid and reliable. During the transport process should be rain-proof pace, the product should be stored in the ventilation, dry place, shall not be stored outdoors. Yuhuan copper ball valve restrained in the rainy weather debugging or inspection, after tightening all the fasteners to be tightened to ensure that all electrical departments sealed precision and reliable valve Diannei selection and travel location mediation control is not correct: There are two tension valve electrical parameters . ① opening and closing torque value should include the actual value of the valve torque value plus the valve itself, the size of the opening and closing valve affect the use of the valve, the force of the big vulnerable, easy to leak. In the selection of matching should have sufficient margin (the same as the valve is usually required to be greater than the actual value of the control torque 1.1 ~ 1.3 times). ② trip position control and valve size, opening and closing time and the layout of the situation and so on. Electrical valve set of motor for a dedicated motor, short-term system, time 10 - 15min. Such as short-term high load during the time, causing the motor insulation insulation grade drop caused damage to the valve Denso and the motor model does not stand room: the selected model of the motor and Denso not room, the actual transmission torque did not leave enough corresponding Of the surplus, overload operation is likely to cause motor damage Electrical cover failure, electrical components of poor quality: the micro switch within the electrical control valve is the key components of the control mechanism, when the valve overrides the travel position, the micro switch intercepts the power supply, From overload protection role. Most electrical manufacturers will trip and torque screen in series together, when the super-stroke or overtorque, the micro-switch real-time interception exchange warfare coil control power supply, so as to intercept the motor main circuit debugging and placing the use of improper use: For the degree of placement and vertical placement of 2 species. When placed vertically, the rear end of the motor is below. In the threading sleeve rubber seal failure, the cavity of the grease through the cable outlet into the motor cavity is easy to make the winding short circuit and burn the motor. ② According to JB 8528 - 1997, the handwheel of the electric device should be biased to be equal to the rotation of the output shaft, clockwise to close the valve, and counterclockwise to open the valve. If the actual rotation of the motor is not in accordance with the delineation, you need to change any two phases of the three-phase power supply. Otherwise, due to the opposite phase, so that the pace of protection failure caused by motor damage. ③ valve special motor is a high load short-time system. If a series of debugging time too long over rated time, causing the motor to damage the electrical heating valve and the valve is not connected to the legislature Room: Multi-turn rotary valve electrical installation is divided into two types of torque and thrust. Most of the torque for the three-jaw adjoining or key connection, the valve Denso axial thrust force is not affected. Thrust type most of the connection for the thread, can withstand greater axial thrust. In order to valve electrical connection between the valve does not interfere with the dry valve must be limited to the common top and valve with the electrical installation of a consistent gap. So that the worm gear placed on the output shaft does not change the axial position to ensure that the central meshing worm gear has a good meshing results ensure that the reported torque to reach the rated output torque value. Motor temperature control screen failure: the motor is equipped with temperature control switch, Yuhuan copper valve when the valve motor over the torque or long run, the motor temperature rises above the set temperature, the temperature control switch immediately intercept control loop , Play a role in shielding the motor. Set a periodic inspection system operation: After the installation of the valve electrical installation, should establish a complete inspection system. Long do not need to check the electrical equipment, regular inspection of motor stator winding insulation resistance value.