This paper describes the mainstream valve manufacturing standards and inspection standards at home and abroad
domestic standards
GB/T 1222021980 General valve markings
GB/T 1222121989 Structural length of flanged metal valves
GB/T 1222221989 Connection of multi-turn valve drives
GB/T 1222521989 Technical requirements for copper alloy castings for general purpose valves
GB/T 1222621989 Technical requirements for grey iron castings for general purpose valves
GB/T 1222721989 Technical requirements for ductile iron castings for general purpose valves
GB/T 1222921989 Technical requirements for carbon steel castings for general purpose valves
GB/T 1223021989 Technical requirements for austenitic steel castings for general purpose valves
GB/T 1223221989 General purpose valves flanged iron gate valves
GB/T 1223321989 General purpose valves Iron globe valves and lift check valves
GB/T 1223421989 General Purpose Valves Flanged and Butt Welding Steel Gate Valves
GB/T 1223521989 General purpose valves flanged steel globe valves and lift check valves
GB/T 1223621989 General Purpose Valves Steel Swing Check Valves
GB/T 1223721989 General purpose valves flanged and butt welded steel ball valves
GB/T 1223821989 General purpose valve flange and wafer connection butterfly valves
GB/T 1224321989 Spring direct load safety valve
GB/T 1224421989 General requirements for pressure reducing valves
GB/T 1393221992 General purpose valves Iron swing check valves
GB/T 1417321993 Technical conditions for flat steel gates
GB/T 1518521994 Iron and copper ball valves
GB/T 846421998 Internally threaded connection valves for water heating
Method for compiling JB30821975 valve model
JB/T 529921998 Hydraulic control check butterfly valve
JB/T 792721999 Appearance quality requirements for valve steel castings
JB/T 792821999 Supply requirements for general valves
JB/T 852721997 Metal sealed butterfly valve
JB/T 852821997 Technical requirements for ordinary valve electric devices
JB/T 853121997 Technical conditions for manual valve devices
JB/T 869121998 Wafer knife gate valve
GB/T 1392721992 General valve pressure test
JB/T 529621991 Test method for flow coefficient and flow resistance coefficient of universal valves
Foreign related standards
ISO 5209 Marking of industrial valves
ISO 5996 Iron Gate Valve
ISO 7259 Underground iron gate valves operated mainly by wrenches
ISO 5208 Industrial valves-Pressure testing of valves
ISO 10631 Metal butterfly valves for general purposes
BS 5150 General purpose cast iron wedge type single or double gate gate valves
BS 5151 General purpose cast iron parallel gate valves
BS 5152 Cast iron globe valves and globe check valves for general purposes
BS 5153 Cast iron check valves for general purposes
BS 5154 General purpose copper alloy globe valves, globe 2 check valves, check valves, gate valves
BS 5155 General purpose cast iron and carbon steel butterfly valves
BS 5159 General purpose cast iron and carbon steel ball valves
BS 5160 General purpose steel globe valves, globe 2 check valves, lift check valves
BS 5163 Technical requirements for gate valves for water supply systems
BS 5433 Technical requirements for underground gate valves for water supply
BS 5417 Inspection of industrial valves for general use
BS 5418 Marking of industrial valves for general use
ANSI/ AWWA C500 Water Supply and Drainage System Gate Valves
ANSI/ AWWA C501 cast iron water gate valve
ANSI/ AWWA C509 Water Supply and Drainage System Resiliently Seated Gate Valves
AWWA A504 Rubber Seat Butterfly Valve
AWWA A507 6~48in. ball valve
The AWWA A608 has a nominal diameter of 2 to 24 inches. Swing check valve for water supply equipment
MSS SP270 Iron gate valves with flanged and threaded ends
JISB 2031 Gray cast iron valve
JISB 2032 Wafer type rubber seat butterfly valve
JISB 2041 Cast iron 10kgf/cm2 flange-connected globe valve
JISB 2042 Cast iron 10kgf/cm2 flanged angle globe valve
JISB 2043 Cast iron 10kgf/cm2 flange-connected concealed stem gate valve
JISB 2044 Cast iron 10kgf/cm2 flange-connected rising stem gate valve
JISB 2045 Cast iron 10kgf/cm2 flanged swing check valve
JISB 2051 10kgf/cm2 malleable cast iron straight threaded globe valve
JISB 2051 10kgf/cm2 malleable cast iron straight threaded gate valve
JISB 2051 10kgf/cm2 malleable cast iron straight threaded lift check valve
JISB 2062 Gate valve for water pipes
JISB 2064 Butterfly valve for water pipes
JISB 2072 Cast steel 10kgf/cm2 flanged angle globe valve
JISB2073 Cast steel 10kgf/cm2 flange-connected rising stem gate valve
JISB 2074 Cast steel 10kgf/cm2 flanged swing check valve
JISB 2081 Cast steel 10kgf/cm2 flange-connected globe valve
JISB 2082 Cast steel 10kgf/cm2 flanged angle globe valve
JISB 2083 Flange-connected rising stem gate valve
JISB 2084 Cast steel 10kgf/cm2 flanged swing check valve
1. Quality requirements
Each standard puts forward relevant requirements for valve quality.① The chemical composition and mechanical properties of the valve body material meet the requirements of relevant material standards.② The deviation of the shape and size of the valve casting shall comply with the specifications of the drawings.③ The non-machined surface of the valve casting should be flat, smooth, free from adhering sand, oxide scale, pores, sand inclusion, cracks and other defects. The cast characters are clearly marked, and the gates and risers should be flush with the casting surface after cleaning.④ All parts of the valve should be connected firmly without loosening.③ The results of the pressure test and sealing performance test of the valve comply with the requirements of relevant test standards.④ The valve should be operated under the conditions of nominal pressure and specified pressure difference, and there should be no blockage in the opening and closing operations.③ It has a certain number of operations and service life. It has a large flow capacity (that is, after passing through the valve, the pressure loss at the valve is small).
2. Inspection and test methods
1 Casting quality
The shape and size of the casting shall comply with the requirements of the technical drawings or the specifications of the purchaser. If the drawings have no requirements for size deviation, the relevant provisions of JB/T2580, GB/T6414, and GB/ T2121 shall be followed for the materials. The minimum wall thickness, structural length deviation, and ram wear and displacement allowance of each part of the valve shall not be less than the requirements of relevant product technical standards or product drawings. The surfaces of valve blanks and finished valve pressure shells must not have flaws such as cracks, cold shuts, sand inclusions and pores. The sand, gates, risers and oxide scales on the casting surface should be cleaned up. The casting should be clear. The pressure bearing shell shall be tested at 115 times the nominal pressure specified in GB/ T 13927 standard, and the result shall be no visible leakage and no structural damage. The chemical composition and mechanical properties of the castings shall comply with the requirements of GB/ T 12225, GB/T 12226, GB/T 12227, GB/T 12229, and GB/ T 12230.
2 Pressure test
Pressure test is the most basic test for valves. Each valve needs to be pressure tested before leaving the factory. The test pressure and duration are in accordance with the provisions of GB/ T13927 standard. The test items include shell test and seal test. When the valve has an upper seal structure, the upper seal test is also required. During the test, no external force that affects the test results shall be applied to the valve. The test pressure should remain unchanged during pressure holding and testing. When using liquid as the test medium, the air in the valve body should be excluded. Valves shall be closed in the manner given by design. Relevant standards for testing include GB/T 13927, MSS SP61, ISO 5208, DIN 3230, API598, NFM 872401, ANSI B16134, J IS B2003, BS 5417 and BS 6755.
The valve shell test is a pressure test on the entire valve shell connected by the valve body and the bonnet. The purpose is to check the tightness of the valve body and bonnet, that is, the pressure resistance of the entire housing, including the connection between the valve body and bonnet. Painting and other leakage-preventing coatings on valves are not allowed until housing testing is carried out. When users conduct random inspections of inventory valves, the existing coating will not be removed. The shell test requires that the shell, including the connection between the valve body and the bonnet, shall not leak or have structural damage.
The seal test is a test to check the performance of the opening and closing parts and valve body sealing pairs. The sealing test is divided into high-pressure liquid sealing test and low-pressure gas sealing test. Before the sealing test, except for valves sealed by grease, the oil stains on the sealing surface should be removed, but protective agents with a viscosity no greater than none are allowed to be applied. During the test, the valve with the specified medium flow direction is pressurized in the specified flow direction, and the check valve is pressurized from the outlet end.
