The method of filling in the factory number of the valve certificate is as follows: (1) Professional stage certificate: Rules: (Z/Y) 2-digit annual code, 2-digit province code, 5-digit sequence number, ***10 digits. The one-time passes for the current year start with Z, and the accumulated passes over the years start with Y. (2) General practice certificate: Rules: (QZ/QY) 2-digit annual code, 2-digit province code, 5-digit sequence number, ***11 digits. Among them, for those who are qualified once in the professional stage in the current year (professional stage certificate number starts with Z), the general qualification certificate number starts with QZ; for those who have accumulated qualifications in the professional stage over the years (professional stage certificate number starts with Y), the general qualification certificate number starts with QY beginning.
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What does the flange control valve certificate number mean?
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What does the flange control valve certificate number represent? Hello, the valve implementation standards are divided into mandatory national standards (GB) and recommended national standards (GB/T). The number of the national standard for valves consists of the code name of the national standard, the sequence number of the national standard release and the year number of the national standard release (year of release). The national standard of valves includes two parts: one is to regulate the manufacturing, structural length, material, etc., and the other is to conduct a standardized search for the structure, size, etc. of each type of valve. Users can look at the corresponding valve according to the certain type of valve they need. standard. This standard mainly provides a brief explanation of the general standards and technical condition standards for valves. The detailed latest national standards can be viewed in the latest information released on the standard website.
Valve national standard code: Valve standard code Valve standard name GB12220-1989 "General valve mark" GB12221-1989 "Structural length of flange-connected metal valves" GB12222-1989 "Connection of multi-turn valve driving device" GB12223-1989 "Partial rotation Connection of valve driving devices" GB12224-1989 "General requirements for steel valves" GB12225-1989 "Technical conditions for copper alloy castings of general valves" GB12226-1989 "Technical conditions for gray iron castings of general valves" GB12227-1989 "Technical conditions for ductile iron castings of general valves" Conditions" GB12228-1989 "Technical Conditions for General Valve Carbon Steel Forgings" GB12229-1989 "Technical Conditions for General Valve Carbon Steel Castings" GB12231-1989 "Appearance Quality Requirements for Valve Castings" GB12232-1989 "Universal Valve Flange Connection Iron Gate Valve 》GB1047-1970 "Nominal diameter of pipes and pipe accessories" GB12236-1989 "General valve steel swing check valve" GB1348-1988 "Ductile iron castings" GB1048-1990 "Nominal pressure of pipe components" GB11365-1989 "Accuracy of bevel gears and hypoid gears" GB4213-1984 "General technical conditions for pneumatic control valves" GB12238-1989 "Universal valve flange clamp connection butterfly valve" GB8335-1987 "Professional threads for gas cylinders" GB10877-1989 "Oxygen cylinder valves" 》GB12239-1989 "General valve diaphragm valve" GB12240-1989 "General valve iron plug valve" GB12241-1989 "General requirements for safety valves" GB12242-1989 "Safety valve performance test method" GB12243-1989 "Spring direct load safety valve 》GB11352-1989