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GB/T 592-2015 English PDF (GBT592-2015)

GB/T 592-2015 English PDF (GBT592-2015)

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GB/T 592-2015: Marine cast iron flanged check valves

This Standard specifies the classification and designation, requirements, test methods, inspection rules, packaging and storage of marine cast iron flanged check valves; their flange connection dimensions and mating face are as specified in CB/T 4196 and GB/T 2501.
GB/T 592-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 47.020.30
U 52
Replacing GB/T 592-1993
Marine Cast Iron Flanged Check Valves
ISSUED ON. JULY 3, 2015
IMPLEMENTED ON. OCTOBER 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Application Scope ... 4
2 Normative References ... 4
3 Classification and Designation ... 5
4 Requirements ... 8
5 Test Methods ... 9
6 Inspection Rules ... 10
7 Packaging and Storage ... 11
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 592-1993, Marine Cast Iron Flanged Lift Check Valves. Compared with GB/T 592-1993, the major changes in technical content are as follows. -- it cancels the use of cast iron stop valves in steam piping system;
-- it modifies the way of designation;
-- it modifies the processing requirements in accordance with GB/T 600. This Standard was proposed by China Shipbuilding Industry Corporation.
This Standard shall be under the jurisdiction of the National Standardization Technical Committee on Marine Machinery (SAC/TC 137).
The drafting organizations of this Standard. Dalian Shipbuilding Industry Co., Ltd., Dalian Jinmei Valve Co., Ltd.
The main drafters of this Standard. Xi Chunqing, Ma Yulong, Liu Xiaopeng, Wei Yanchun, Zhang Hezhi, Yu Changkun.
The previous editions of the standard replaced by this Standard are as follows. -- GB 592-1965, GB 592-1976, GB 592-1984, GB/T 592-1993.
Marine Cast Iron Flanged Check Valves
1 Application Scope
This Standard specifies the classification and designation, requirements, test methods, inspection rules, packaging and storage of marine cast iron flanged check valves; their flange connection dimensions and mating face are as specified in CB/T 4196 and GB/T 2501.
This Standard applies to the design, manufacture and acceptance of check valves for piping systems whose medium is sea water, fresh water, lubricating oil or fuel oil. 2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced documents (including all amendments) applies to this Standard.
GB/T 600-2008, General Specifications for Marine Piping Valves and Fittings GB/T 1176-2013, Casting Copper and Copper Alloys
GB/T 1184-1996, Geometrical Tolerancing ?€? Geometrical Tolerance for Features without Individual Tolerance Indications
GB/T 1804-2000, General Tolerances ?€? Tolerances for Linear and Angular
Dimensions without Individual Tolerance Indications
GB/T 1958, Geometrical Product Specifications (GPS) ?€? Geometrical Tolerance ?€? Verification Prescription
GB/T 2501, Connection Dimensions and Mating Face of Marine Flanges
GB/T 3032, Marks for Marine Piping Valves and Fittings
GB/T 9439-2010, Grey Iron Castings
GB/T 11698, Metal Valves for Use in Marine Flanged Pipe Systems ?€? Face-to-face and Center-to-face Dimensions
CB/T 3927, Wall Thickness of Casting Body for Marine Valve
CB/T 4196, Marine Pipe Flanges ?€? Connection Dimensions and Mating Face
4.6 Appearance
The appearance of check valves shall be as specified in GB/T 600-2008, 3.10. 4.7 Mass
See Table 2 and Table 3 for the masses of check valves; their positive deviation shall not exceed 4% of design mass.
4.8 Marking
The marking of check valves shall be as specified in GB/T 3032.
5 Test Methods
5.1 Material
The test methods for chemical composition and mechanical properties for the castings of check valves are specified in GB/T 1176-2013 and GB/T 9439-2010; other materials are inspected by inspecting the material designation and material quality certificate. The results shall be as specified in 4.1.
5.2 Strength
The method for the strength test of check valves is as specified in GB/T 600-2008, 4.12.3. The results shall be as specified in 4.2.
5.3 Air-tightness
The method for the air-tightness test of the valve disk and valve seat of check valves is specified in GB/T 600-2008, 4.13.3. The results shall be as specified in 4.3. 5.4 Dimensional tolerances
The linear dimensional tolerances of check valves shall be inspected with a measuring tool of an appropriate grade. The results shall be as specified in 3.3 and 3.4. 5.5 Geometric tolerances
The geometric tolerances of check valves shall be inspected as specified in GB/T 1958. The results shall be as specified in 4.5.
5.6 Appearance
The appearance of check valves is inspected by visual inspection. The results shall be as specified in 4.6.
5.7 Mass
7 Mass ??? - 4.7 5.7
8 Marking ??? ??? 4.8 5.8
NOTE ??? a required item; - a non-inspection item.
6.2.3 Quantity of samples for inspection
The quantity of samples for the type inspection of check valves shall be 3. 6.2.4 Evaluation criteria
If all samples of check valves pass all inspection items, then the type inspection is decided to be a pass. In case there is any check valve whose materials are not as specified, then the type inspection is decided to be a fail; in case of any item which is not as specified, a reinspection shall be performed by doubling samples; if the reinspection is a pass, then the type inspection of check valves is decided to be a pass; if there is still any unsatisfactory item in the reinspection, the type inspection of check valves is decided to be a fail.
6.3 Exit-factory inspection
6.3.1 Inspection items
See Table 5 for the exit-factory inspection items and sequence of check valves. 6.3.2 Quantity of test samples
Except that materials are tested in accordance with the batch grouping specifications (one batch consisting of materials of the same furnace number), other inspections shall be performed on products one by one.
6.3.3 Evaluation criteria
If all samples of check valves pass all inspection items, then the exit-factory inspection is decided to be a pass. In case there is any check valve whose materials are not as specified, then the exit-factory inspection is decided to be a fail; in case of any check valve which is not as specified, a reinspection is allowed after rework is done. if the reinspection is a pass, then the exit-factory inspection of check valves is decided to be a pass; if there is still any unsatisfactory item in the reinspection, the exit-factory inspection of check valves is decided to be a fail.
7 Packaging and Storage
The packaging and storage of check valves are specified in GB/T 600-2008, Article 6.

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