FC series for regulating the flow volume of liquids and gases. The position of the precision throttle, which is connected directly to a linear motor, determines the flow rate.
This valve is used in the food industries, gas blending, water mixing, vacuum control...etc
The control electronics allow the setting of the motor via an analog or digital signal, whereby the flow rate can be adjusted almost continuously. A set position can also be maintained unpowered due to the stepper motor technology.
Electronic flow regulator and the electronic flow valve are the devices that are able to control the flow rate of fluid (liquid and gas) with an electronic signal. The digital water flow regulator is used in order to regulate the liquid flow rate while, for the gas pressure handling, electronic air flow control valve is efficiently working well usually to control the speed of cylinders and air motors.
An electronic pneumatic flow control valve combining with a digital flow meter for closed loop control facilitates users with the digital reading of the liquid or gas flow rate that means the users can expect the precise quantity of flow. The digital flow control valve also offers the function of an in-built flow governing.
In various heavy manufacturing industries the electronic water flow control valve works as a power-operated device to regulate the flow of the fluid. The automatic water flow control valve lets the users get the automated digital measurement of the quantity of the liquid flow.
Ideally, the output flow rate is linearly proportional to input signal. There are different types of working principle, and in this article we will be introducing you the needle valve type driven by a stepper motor powered linear actuator. We will firstly introduce you what type of pneumatic flow control valves we offer, followed by the working principle and with what is the main advantage of KaoLu's electronic flow control valves, and then conclude with what you should think about before purchasing an electric flow control valves.
There are different types of electronic flow controller. Here we will be explaining the type that utilizes a linear stepper motor actuator and proportional needle valve.
Firstly, what is a stepper motor?
Stepper motors are brushless DC motors that rotate in steps set by a driver. The steps are determined by step angle and lead screw and controlling electronics. The driver provides electric current through electromagnets that are arranged in a ring as part of the stator assembly (the stationary portion of the motor). Due to the mechanical design of the stepper motor, the mechanical and electrical delays are minimized, which is often a problem with other types of motors. With a stepper motor, the moving accuracy, resolution, and responsiveness is a greatadvantage over others. Stepper motor has been widely used in automation, motion system, and 3D printers.
Next, what is a stepper motor linear actuator?
A stepper motor can have a threaded shaft attached to its rotating core which can then be used to push or pull a nut (needle valve) placed upon it, moving it axially. The pitch of the thread controls the resolution of the flow control valve is, this is also dictated by the step angle of the used stepper motor (full, half, quarter, etc.). Like most linear motion systems, a stepper linear actuator is sensitive to the backlash, which is defined as the maximum distance or angle through which any part mechanical part may be moved in one direction without applying resistive force or motion to the next part.
Having clearance between threads results in a dead zone when the direction of travel is changed. When reversing direction, there will be no movement in the linear actuator until the clearance between threads is removed (the threads make contact again). For this reason, it is recommended that the threads have as tight a tolerance as possible. Mechanical design of stepper motor driven actuation system is imperative to the performance of the valve.
Next, what is a stepper motor driven electronic flow control valve?
Here a stepper motor is used to control the distance between the needle and valve seat. The performance parameters of flow regulating valve, such as resolution, accuracy, and repeatability are determined by how well the position of the needles is adjusted. Other parameters such as velocity, torque, the operating pressure are mainly determined by the characteristics of the stepper motor.
So, what is the advantage of KaoLu's electronic flow control valve?
Our parameters tell the entire story. With FC series electronic flow control, we are able to withstand 7 bar of perpendicular operating pressure, with a resolution as high as 20 mL/min of air, repeatability of 0.1% F.S, and 0.1% of linearity. This is due to the motor we used, and the low flow valve to extremely low tolerance of mechanical parts, the fine thread needle we used which is extremely difficult to reproduce by others, and the control system we designed.
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