江阴市电磁阀厂

Correct choice should pay attention to the valve electrical device

　　 Program-controlled valve is the valve electrical installations, and remotely controlled equipment indispensable, and its process could journeys Torque or axial thrust to control the size. Since the valves and electrical equipment utilization depends on the characteristics of the valve types, device parameters and the position of the valve in the pipeline or equipment, the correct choice of electric valve device to prevent overload (which control torque than the work of torque) is essential. Usually, the correct choice of the valve electrical device based on the following : valve operating torque electric devices operating torque is the most important parameter choice, Output torque electric valve operation for the 1.2 ～ 1.5 times the maximum torque.
Thrust operation of the valve electrical device has two mainframe configuration : a thrust plate is not a direct output torque; Another thrust is the allocation of disk, and the output torque to thrust the stem nut sites converted to export thrust. Output shaft rotating coil valve electrical device and the output shaft rotational The number of times the nominal Path valve, the valve pitch. Thread the head, according to M=H/ZS calculation (M electrical device should satisfy the total number of revolutions. H attached to the valve opening, the S thread pitch to stem transmission, threaded rod for the first few Z). Stem diameter of the valve rod out more rotational. If allowed by the electrical device which passed the largest allocation of stem diameter of the valve stem, it can assemble electric valve.
Therefore, the electrical device to be more than a hollow output shaft diameter of the valve stem diameter rod out. Some of the rotary valve as well as the dark bar valve rotary valve, although they do not have to consider the adoption of stem diameter. But in matching stem diameter and should be taken into full consideration when the keyway sizes, assembled after normal work. If the excessive speed of the hoist speed valve output, and is easy to produce water hammer. Therefore, under different conditions of use, choose appropriate hoist speed. Valve Electric has its unique requirements that must be able to limit the axial force or torque. Valve electrical device normally used for axle torque limit.
When the electrical device specifications determined, it established its control torque. General operating in a pre-determined period of time, do not overload electrical. But if any of the following situations : First, it may lead to overload the low voltage power supply, will not be able to obtain the necessary torque. stop motor rotation; Second, it is wrong to set the torque limit, it is greater than the torque stop, Continuous have caused too much torque, making the motor to stop turning; Third intermittent use of the heat generated savings. Allow the temperature rise over the motor; Fourth, for one reason or another body torque limit circuit failure, excessive torque; Fifth, the use of high temperature, relative decline in motor thermal capacity. The past is for the protection and use of electrical fuses, relays flow, thermal relays, thermostats,
However, these methods have their advantages and disadvantages. Such a change of the electrical device load equipment, protective method is not absolutely reliable. Therefore, we must take all kinds of combinations, be summed up in two ways : First, changes in the electrical input current judge; Second is the heat of its own motor judge. These two modes, which must be given time to consider the electrical heat capacity cushion. Typically, the overload protection is basic : Continuous operation of the electrical operating point of overload protection or, 200025; Blockage of the electrical protection thermal relay; on the short circuit faults using fuse or overcurrent relays.