Exposure draft of the standard for the hottest aut

2022-08-16
  • Detail

Abstract: an automatic valve with bypass is installed at the outlet of the pump, which is usually a T-shaped three-way structure; The main circuit is a check valve with sensitive flow, which can prevent medium backflow; The bypass is a pressure reducing valve, which can provide the minimum continuous flow protection of the pump; Automatic switching can be realized between main circuit and bypass

this standard specifies the terms and definitions, structural types, technical requirements, materials, inspection and test methods, inspection rules, marks, packaging and storage of automatic return valves

this standard is applicable to steel T-shaped structure automatic return valves used in petroleum, chemical industry, electric power and related industries with nominal pressure PN20 ~ pn420, nominal internal and external rotor tooth side clearance too large, size DN25 ~ DN500, medium temperature -2 and a capacity of more than 40000 tons, 9 ℃ ~ 538 ℃

other types of automatic return valves can also be implemented by reference

1 normative references

the following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document

gb/t 228 tensile test method for metallic materials at room temperature

gb/t 1239.2 technical conditions of cold rolled cylindrical spiral compression spring

gb/t 9113 integral steel pipe flange

gb/t 9124 technical conditions of steel pipe flange

gb/t 12220 general valve mark

gb/t 12221 flange connected valve structure length limit deviation

gb/t 12224 General requirements for steel valves

gb/t 12229 general valve carbon steel casting technology condition

g sensor Full range measurement of b/t 12230 general purpose valve stainless steel castings technical conditions

gb/t steel stop valves and lift check valves for petroleum, petrochemical and related industries

gb/t industrial valve pressure test

gb/t 17213 Industrial process control valves - Part 4: Inspection and routine tests

gb/t 17213 Industrial process control valves Part 2-3: flow capacity test procedure

jb/t 106 marking and painting of valves

carbon steel and alloy steel forgings for jb/t pressure equipment

stainless steel and heat resistant steel forgings for jb/t pressure equipment

1 terms and definitions

the following terms and definitions apply to this document

1 automatic recirculation valve

its experimental load is loaded by hydraulic principle The automatic valve with bypass is installed at the outlet of the pump, usually in a T-shaped tee structure; The main circuit is a check valve with sensitive flow, which can prevent medium backflow; The bypass is a pressure reducing valve, which can provide the minimum continuous flow protection of the pump; Automatic switching can be realized between main circuit and bypass

this standard is now for comments. Industry experts and scientific and technological workers are welcome to actively participate

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