电磁阀二位是指电磁阀的阀芯有两个不同的工作位置（开、关）。.电磁阀二通、三通指电磁阀的阀体上有两个、三个通道口；

比如二位二通电磁阀是一进一出（二个通道、zui普通常见）

二位三通电磁阀控制液体是一进二出（两出分别是一个常开一个常闭）；气动换向电磁阀是一进一出一排气；液压一进一出一回油。2W water brass, stainless steel solenoid valve for small automatic control equipment, pipe is generally used in industrial rubber tube 8 ~ 12mm of. In electrical terms, the two-way solenoid valve is usually a single electronic control (that is, single coil), two five-way solenoid valve is typically double-controlled (ie, dual-coil). Coil voltage rating generally use DC24V, AC220V and so on. ) Is divided into two three-way solenoid valve normally closed and normally open type two, normally closed refers to the coil is not energized gas line is off, the normally open type refers to the coil is not energized gas line is capable of.

国内外的2W水用黄铜、不锈钢电磁阀从原理上分为三大类（即：直动式、分步直动式、先导式），而从阀瓣结构和材料上的不同与原理上的区别又分为六个分支小类（直动膜片结构、分步重片结构、先导膜式结构、直动活塞结构、分步直动活塞结构、先导活塞结构)。

直动式电磁阀：原理：通电时，电磁线圈产生电磁力把关闭件从阀座上提起，阀门打开；断电时，电磁力消失，弹簧把关闭件压在阀座上，阀门关闭。

2W water brass, stainless steel solenoid valve principle: normally closed direct acting solenoid valve is energized, the electromagnetic coil electromagnetic suction lift the spool so that the closure member to stay away open seating deputy opened; when the power, the electromagnetic force disappear by spring force of the closing element is pressed against the seat valve closes. (In contrast to this, normally-open)

2W water brass, stainless steel solenoid valve Features: can operate in vacuum, negative pressure, zero pressure normal, DN50 any of the following may be installed, but the larger volume electromagnetic head. If my company HERION company introduced technology to produce direct-acting solenoid valve can be used in 1.33 × 10-4