Northman北部精机,叠加式单向节流阀MT-02-A-30,MT-02-A-I-30,MT-02-A-K-30,MT-02-A-K-I-30,MT-02-W-30,MT-02-W-I-30,MT-02-W-K-30,MT-02-W-K-I-30,MT-04-A-30,MT-04-A-I-30,MT-04-A-K-30,MT-04-A-K-I-30,MT-06-W-K-I-30