Vogel换向阀,VGKC DIN912-M4X12-A4 DIN912-M4X12-A4尺寸参数,VGKC DIN912-M4X12-A4 DIN912-M4X12-A4价格货期   VGKC DIN912-M4X12-A4 DIN912-M4X12-A4