620S 系列的阀体、阀板均用钢板焊接，是一种重量轻、结构合理的三偏心蝶阀。适用于低压状态空气及其他气体的流量、压力控制，此外也适用于高温状态的气体。

The valve body and disc of the 620S series Butterfly valves are made of machined steel plates. This allows light and proper construction. Typical application are flow/pressure controls of low-pressure air and gas. Hight temperature fluid at low pressure levels can also be accommodated inexpensively and easily.