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Class 300 Butterfly Valve Standards Flange Butterfly Valves: MSS SP-67 Water Butterfly Valves: MSS SP-68 or API 609 Face to Face Dimensions: ANSI B16.10 MSS SP-67 and MSS SP-68 or 609 Test: API598 End flange dimensions NPS 1 1/2-24; ANSI B 16.5 NPS 30-72 MSS SP-44 or API 605 Type of construction Flange Butterfly Valves (Hard face and soft face) Wafer Butterfly Valves (Hard face and soft face) Type of connection R F and RTJ flange ends to ANSI B 16.5 or API 605 and MSS SP-44 standard. Type of Operation Lever Worm Gear actuator, electric actuator, Pneumatic actuator. Actuator Dimensions to ISO 5211 standard.