This standard specifies marine forged steel 20K angle valves (hereinafter referred to as angle valves) used in ships' steam pipes, air pipes, fuel oil pipes, lubricating oil pipes, fresh water pipes, water supply pipes, etc.
JIS F 7422:1996 history
2009JIS F 7428:2009 Ships and marine technology -- Forged steel valves
1996JIS F 7422:1996 Shipbuilding -- Forged steel 20K angle valves