Northman北部精机,两通常开式锥阀SV12-21S-N-0-DG,SV12-21S-N-0-DL,SV12-21S-N-0-DR,SV12-21S-V-0-DR,SV12-21S-V-0-AG,SV12-21S-V-0-AP,SV12-21S-V-230-DG,SV12-21S-V-230-DL,SV12-21S-V-230-DR,SV12-21S-V-230-AG