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It is suitable for residential air-conditioner with R22,R407C,R410A as refrigerant,to control indoor unit and outdoor unit,through operating valve system clockwise,the valve will be closed ,otherwise open it ,It can be a checking valve to drain air and add refrigerant during maintaining ,also be used in other refrigerating circlesystems. Catalogue NoOrifice(mm)Connection thread sizeConnection sizemm(in)Match (HP)RefrigerantMax pressureSMV-JA3Φ7.55/8"-18UNFΦ9.52(3/8")1-54.2MpaSMV-JA4Φ14.53/4"-16UNFΦ12.7(1/2")1.5-10SMV-JA5Φ14.57/8"-14UNFΦ15.88(5/8")2-12SMV-JA6Φ14.51 1/16"-14UNSΦ19.05(3/4")5-8R22SMV-JA7Φ17.61 1/16"-14UNSΦ22.2(7/8")6-12R407CSMV-JA3YΦ7.5/Φ9.52(3/8")1-5R410ASMV-JA4YΦ14.5/Φ12.7(1/2")1.5-10SMV-JA5YΦ14.5/Φ15.88(5/8")2-12SMV-JA6YΦ14.5/Φ19.05(3/4")5-8SMV-JA7YΦ17.6/Φ22.2(7/8")6-12SMV-JA8YΦ22.0/Φ25.4(1")6-12SMV-JA9YΦ22.0/Φ28.58(1-1/8")8-16