③线圈及位数Coil and Median | 10:单头双位置Single-head Double-position, 20:双头双位置Double-head Double-position, 30C:双头三位置封闭型Double-head Three-position Close Type, 30E:双头三位置排气型Double-head Three-position Exhaust Type, 30P:双头三位置压力型Double-head Three-positionExhaust Pressure Type |