National and international valves common standard code

National and international valve common standard code:

CVA-- Valve Association Standard BS-- British National Standard EJ--Ministry of Nuclear Industry Standard JIS--Japanese Industrial Standard YB--Ministry of Metallurgy Standard DIN-- German Standard HGHGJ--Ministry of Chemical Industry Standard ASTM--American Material Testing Standard Q/TH--A Department of Chemical Industry General Machinery Professional Standards API--American Petroleum Institute Standards DF--High Pressure Manure Valve Design Standard MSS--American Valve Association Standard GB--National Standard ISO--International Standard JB--Mechanical Department Standard ANSI--US Standard SY--Ministry of Petroleum Standard NF--French Standard DL--Ministry of Energy Machinery