比例式夾管閥的流體與機構分離的優點在於需要清潔和無菌高精度流量控制比電磁閥式
夾管閥產生更有利的夾持和無壓縮空氣的消耗。每一個閥包括一個雙級步進電機， 步進馬達
接收到控制器的 PWM 方波脈衝，每一個矩形脈衝波轉換成 1.8 度旋轉的步進電機。安裝在步
進電機是一步旋轉的距離為 0.0127mm 的線性運動的日本生產高精度導螺杆。建議使用管子
硬度在 50 - 75 Shore A。
The advantage of proportional pinch valves is the need for clean and sterile high-precision flow control to
produce more controllable pinching force. Each valve includes a stepper motor that receives PWM square wave pulse
from the controller and converts each pulse into a stepper motor that rotates at 1.8-degre. The stepper motor is a
high-precision lead screw produced in Japan with a linear motion with a step rotation of 0.0127 mm. Tubing hardness
of 50 - 75 Shore A is recommended.