• JIS B 2031-2013 灰口铸铁阀 Gray cast iron valves.pdf
• JIS B2031-1994 Gray cast iron valves.pdf
• MSS SP-85-2002 法兰端和螺纹端灰铸铁截止阀和角阀 GRAY IRON GLOBE ANGLE VALVES FLANGED AND THREADED ENDS.pdf