阀的部分零件组装在电磁铁内，因此该阀的结构更为紧凑。二位二通和二位三通是该换向阀的基本结构形式。2只阀组装在一起底板上，即可实现三位三通和三位四通作用的换向阀。
此种阀装上底板，即可成为管接式换向阀，并且可在其底板上选装其它作用的阀，由此可进一步扩大其应用范围。与WH型相比，WN型的结构设计更为简单，成本比较低。但由于无动密封和无电磁铁单独卸荷，其最大允许工作压力也相应减低。许多只阀可并联组成液压控制系统所需的阀块。

常用型号如下：

WH3R-G24
WH1R-L24
WH2N-X24
WH1H-G24
WH2H-G24
WH1H-G24
WH4N-G24
WH1R-X24
WH1D-G24
WH1R-X24
WH2D-G24
WH1R-G24
WH2H-X24
WH1N-G24
WH3Q-X24
WH2R-X24
WH1D-G24
WH2R-X24
WH3Q-X24
WH1Q-G24
WH1Q-G24
WH3H-X24
WH2H-G24
WH3R-G24
WH1R-G24
WH2H-X24
WH1N-G24
WH4N-G24
WH2D-G24
WH2Q-G24
WH1R-L24
WH2Q-G24
WH3H-X24
WH2N-X24
WH2N1-G24
WH2N1-G24
WH3F-WG230
WH3F-WG230
WH3H-WG230
WH3H-WG230
WH3H-G24/8W
WH3N-X24/8W
WH3H-X24/8W
WH3H-G24/8W
WH3H-X24/8W
WH3N-X24/8W
WH1D-1/4-L24
WH1F-1/4-L24
WH1H-1/4-G24
WH1F-1/4-L24
WH1R-1/4-G24
WH1D-1/4-L24
WH1R-1/4-G24
WH1H-1/4-G24
WH1F-1/4L-G24
WH1D-1/4L-G24
WH1D-1/4L-G24
WH1F-1/4L-G24
WH3H-X24-8ATTW
WH3H-X24-8ATTW