According to structure features, parallel plane field and axisymmetrical field were used in approximate calculations of core and yoke of the valve respectively.
根据电磁阀的结构特点，将磁芯和磁轭分别按平行平面场和轴对称场近似处理。
2
A cut-off planevalve applicable for the hydraulic shield in the coal mine is introduced, which has the feature of high pressure, large flux and small handling moment.
The boom with this valve can be withdrawn automatically from water that the plane recycling method can be realized to recycle oil spilt on effectively.