電磁閥二位是指電磁閥的閥芯有兩個不同的工作位置（開、關）。.電磁閥二通、三通指電磁閥的閥體上有兩個、三個通道口；
比如二位二通電磁閥是一進一出（二個通道、zui普通常見）
二位三通電磁閥控制液體是一進二出（兩出分別是一個常開一個常閉）；氣動換向電磁閥是一進一出一排氣；液壓一進一出一回油。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.
國內外的2W水用黃銅、不銹鋼電磁閥從原理上分為三大類（即：直動式、分步直動式、先導式），而從閥瓣結構和材料上的不同與原理上的區別又分為六個分支小類（直動膜片結構、分步重片結構、先導膜式結構、直動活塞結構、分步直動活塞結構、先導活塞結構)。
直動式電磁閥：原理：通電時，電磁線圈產生電磁力把關閉件從閥座上提起，閥門打開；斷電時，電磁力消失，彈簧把關閉件壓在閥座上，閥門關閉。
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
