In operation efficiency and energy saving, the use of automatic control valve is an indispensable link, the traditional industry commonly used manual valve, pneumatic valve, in the installation cost and efficiency are less than Motorised Valve.
On the product itself, Motorised Valve with easy assembly, low failure rate and meet the industry’s automation needs, is a more cost-effective choice. Because the general use of traditional pneumatic valves, there is inevitably to be piping, solenoid valves and compressors to match, and electric valves are motor-driven, easy to install, and the installation of electric valves with the factory’s original automatic control line can be Save on other costs and expenses. In addition, the motor-driven way to open and close more smoothly, without the instant impulse too large shortcomings, the failure rate can be greatly reduced.
Motorised Valves are suitable for operation of valves and valves connected to one of the devices. The device is electrically driven and its movement can be controlled by stroke, torque or axial thrust. Due to the valve electric device should have the working characteristics and utilization depends on the type of valve, device specifications and valve in the pipeline or equipment location. Therefore, it is very important to know the correct choice of electric valve device and to consider the prevention of overload (working torque is higher than control Torque) .
In the past, the methods of motor protection were using fuses, over-current relays, thermal relays, thermostats, etc. . However, these methods also had their own advantages and disadvantages There is no foolproof way to protect it. Therefore, it is necessary to adopt a combination of methods. However, it is difficult to propose a unified approach because of the different load conditions of each electric device. But in most cases, you can also find common ground.
There Are 2 Kinds Of Overload Protection Methods
1. To judge the increase or decrease of the motor input current;
2. Judge the heat of the motor itself.
Either way, the given time allowance for the thermal capacity of the motor must be taken into account. It is difficult to reconcile this with the thermal capacity characteristics of the motor in a single way. Therefore, we should choose the method of reliable action according to the cause of overload-combination compound mode to achieve a comprehensive overload protection.
Basic Protection Method Of Overload
1. Use A thermostat to protect the motor from overload during continuous operation or point operation
2. Thermal relay is used to protect the motor from blocking
3. Use Fuse or overcurrent relay for short circuit accident.
The correct selection of Valve Electric Device and the prevention of overload are related and should be paid attention to.
Post time: Jul-28-2021