Details of construction and installation of electric valves The operating force of the electric valve is larger than that of the ordinary valve. The speed of the electric valve can be adjusted. The structure is simple and easy to maintain. Due to the cushioning characteristics of the gas itself during operation, it is not easy to be damaged due to jamming, but it must have a gas source and its control. The system is also more complex than electric valves. This type of valve should generally be installed horizontally in the pipeline. Motorized valves are typically composed of electric actuators and valves. The electric valve uses electric energy as power to drive the valve through the electric actuator to realize the switching action of the valve. Thereby achieving the switching purpose of the pipeline medium. So, what are the details of the electric valve during the installation process? Plant extracts are based on plants as raw materials. According to the needs of the use of the final product extracted, through a physical and chemical extraction and separation process, one or more effective ingredients in the plant are obtained and concentrated, without changing the effective ingredients. The product formed by the structure. Plant extract,milk thistle extract,Quercetin,mushroom extract,rutin PYSON Co. ,Ltd. , https://www.pysonbio.com
The electric valve device is an indispensable device for realizing valve program control, automatic control and remote control. The movement process can be controlled by the stroke, torque or axial thrust. Since the working characteristics and utilization rate of the electric valve device depend on the type of valve, the working specifications of the device and the position of the valve on the pipeline or equipment, the correct selection of the electric valve device prevents overloading (the working torque is higher than the control). Torque) is crucial. In general, the basis for the correct selection of electric valve devices is as follows:
Operating torque The operating torque is the main parameter of the choice of the electric valve device. The output torque of the electric device should be 1.2 to 1.5 times the large torque of the valve operation.
There are two types of mainframe structures for operating the thrust electric valve device: one is to configure the thrust disc without the thrust disc, and the other is to configure the thrust disc, and the output torque is converted into the output thrust through the stem nut in the thrust disc.
Number of output shaft rotations The number of rotations of the output shaft of the electric valve device is related to the nominal diameter of the valve, the pitch of the valve stem, and the number of threads. It should be calculated according to M=H/ZS (M is the total rotation circle that the electric device should meet). Number, H is the valve opening height, S is the stem drive thread pitch, and Z is the stem thread number).
Stem diameter for multi-turn type open rod valves, if the diameter of the large stem that the electric device allows to pass cannot pass through the valve stem of the valve, it cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow shaft of the electric device must be larger than the outer diameter of the stem of the open rod valve. For the partial rotary valve and the dark rod valve in the multi-turn valve, although the problem of the diameter of the stem is not considered, the diameter of the stem and the size of the keyway should be fully considered in the selection, so that the assembly can work normally.
If the opening and closing speed of the output speed valve is too fast, water hammer is likely to occur. Therefore, the appropriate opening and closing speed should be selected according to different conditions of use.
Electric valve devices have special requirements that must be able to limit torque or axial forces. Usually the electric valve device uses a torque limiting coupling. When the specifications of the electric device are determined, the control torque is also determined. Generally running in a predetermined time, the motor will not be overloaded. However, if the following conditions occur, the overload may be caused: first, the power supply voltage is low, the required torque is not obtained, and the motor stops rotating; second, the torque limiting mechanism is erroneously set to be greater than the stopped torque. Cause continuous excessive torque generation, so that the motor stops rotating; Third, intermittent use, the generated heat accumulation exceeds the allowable temperature rise of the motor; Fourth, for some reason, the torque limiting mechanism circuit fails, causing the torque to pass Large; five is the use of ambient temperature is too high, relative to the motor thermal capacity decreased.
In the past, the protection of the motor was to use fuses, overcurrent relays, thermal relays, thermostats, etc., but these methods have their own advantages and disadvantages. For the variable load device of the electric device, there is no absolute and reliable protection method. Therefore, various combinations must be adopted, and there are two types that can be summarized: one is to judge the increase and decrease of the input current of the motor; the other is to judge the heat of the motor itself. In either case, the time margin given by the thermal capacity of the motor must be considered.
Generally, the basic protection method of overload is: using a thermostat for overload protection of continuous or jog operation of the motor; using a thermal relay for the protection of the motor stall; and using a fuse or an overcurrent relay for a short circuit accident.
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Details of construction and installation of electric valves