万人炸金花

Your present location: Zhongliang Valve Industry (Jiangsu) Co., Ltd. >> News Center >> Industry News >> Valve electric device is an indispensable device for realizing valve current control, automatic control and remote control

Valve electric device is an indispensable device for realizing valve current control, automatic control and remote control

[作者:中良阀业] [日期:19-07-17] [点击: [Source: from the network] [Author: Zhongliang Valve Co.] [Date: 19-07-17] [Views: ]
Valve electric device is an indispensable device for realizing valve current control, automatic control and remote control. Its motion process can be controlled by stroke, torque or axial thrust. Because the working characteristics and utilization rate of valve electric devices 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 valve electric devices can prevent overloading (the working torque is higher than the control Torque) is critical.
其特殊要求,即必须能够限定转矩或轴向力。 Valve electric devices have special requirements, that is, they must be able to limit torque or axial force. Valve electric devices usually use couplings that limit torque. When the size of the electric device is determined, its control torque is also determined. The motor is generally operated within a predetermined time, and the motor will not be overloaded. However, the following conditions may cause overload: First, the power supply voltage is low and the required torque is not obtained to stop the motor; second, the torque limit mechanism is incorrectly adjusted to make it larger than the stopped torque. It causes continuous excessively large torque to stop the motor. Third, intermittent use, the heat generated exceeds the allowable temperature rise of the motor. Fourth, the circuit of the torque limiting mechanism fails for some reason, causing the torque to be excessive. Large; Fifth, the ambient temperature is too high, which relatively reduces the motor's thermal capacity.
In the past, the methods to protect the motor were to use fuses, overcurrent relays, thermal relays, thermostats, etc., but these methods have advantages and disadvantages. There is no absolutely reliable protection method for load-changing equipment such as electric devices. Therefore, various combinations must be adopted. There are two types of induction: one is to judge the increase or decrease of the motor input current; the other is to judge the heating of the motor itself. In these two methods, regardless of the type, the time margin given by the motor thermal capacity must be considered.
If the opening and closing speed of the output speed valve is too fast, water hammer will easily occur. Therefore, the appropriate opening and closing speed should be selected according to different use conditions.
特殊要求,即必须能够限定转矩或轴向力。 Valve electric devices have special requirements, that is, they must be able to limit torque or axial force. Valve electric devices usually use couplings that limit torque. When the size of the electric device is determined, its control torque is also determined. The motor is generally operated within a predetermined time, and the motor will not be overloaded. However, the following conditions may cause overload: First, the power supply voltage is low and the required torque is not obtained to stop the motor; second, the torque limit mechanism is incorrectly adjusted to make it larger than the stopped torque. It causes continuous excessively large torque to stop the motor. Third, intermittent use, the heat generated exceeds the allowable temperature rise of the motor. Fourth, the circuit of the torque limiting mechanism fails for some reason, causing the torque to be excessive. Large; Fifth, the ambient temperature is too high, which relatively reduces the motor's thermal capacity.
In the past, the methods to protect the motor were to use fuses, overcurrent relays, thermal relays, thermostats, etc., but these methods have advantages and disadvantages. There is no absolutely reliable protection method for load-changing equipment such as electric devices. Therefore, various combinations must be adopted. There are two types of induction: one is to judge the increase or decrease of the motor input current; the other is to judge the heating of the motor itself. In these two methods, regardless of the type, the time margin given by the motor thermal capacity must be considered.
Generally, the basic protection method for overload is to use a thermostat for the overload protection of the motor in continuous operation or jog operation; to protect the motor from stalling, use a thermal relay; for short-circuit accidents, use a fuse or an overcurrent relay.
Copyright: Zhongliang Valve Industry (Jiangsu) Co., Ltd. | Pneumatic regulating valve , steam regulating valve , pneumatic ball valve