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GB/T 586-2015 English PDF (GBT586-2015)

GB/T 586-2015 English PDF (GBT586-2015)

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GB/T 586-2015: Marine cast steel flanged check valves

This Standard specifies the classification and marking, requirements, test methods, inspection rules, packaging and storage for marine cast steel flanged check valve of flange connection size and sealing surface according to GB/T 4196, GB/T 2501.
GB/T 586-2015
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 47.020.30
U 52
Replacing GB/T 586-1999
Marine cast steel flanged check valve
ISSUED ON. JULY 3, 2015
IMPLEMENTED ON. OCTOBER 1, 2015
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification and marking ... 5
4 Requirements ... 9
5 Test methods ... 11
6 Inspection rules ... 12
7 Packaging and storage ... 13
Foreword
This Standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This Standard replaces GB/T 586-1999 Marine cast steel flanged check
valves. Compared with GB/T 586-1999, the main technical modifications are as follows.
- added AS type, BS type PN16, DN65 and DN80;
- changed valve body, bonnet, valve plate materials;
- changed valve body, bonnet sealing surface surfacing materials;
- modified structure size according to construction drawings;
- modified marking method;
- modified flange sealing surface size and bolt hole number according to GB/T 2501;
- modified processing requirements according to GB/T 600.
This Standard was proposed by China Shipbuilding Industry Corporation.
This Standard shall be under the jurisdiction of National Technical Committee on Marine Machinery of Standardization Administration of China (SAC/TC
137).
The drafting organizations of this Standard. Dalian Shipbuilding Heavy
Industry Group Co., Ltd., Dalian Golden Valve Co., Ltd.
Main drafters of this Standard. Yang Mingzhen, Ma Yulong, Liu Xiaopeng, Zhang Ping, Zhang Hezhi, Yu Changkun.
Versions of standard substituted by this Standard are.
- GB 586-1965, GB 586-1976, GB 586-1984, GB/T 586-1999.
Marine cast steel flanged check valve
1 Scope
This Standard specifies the classification and marking, requirements, test methods, inspection rules, packaging and storage for marine cast steel
flanged check valve of flange connection size and sealing surface according to GB/T 4196, GB/T 2501 (hereinafter referred to as check valve).
This Standard is applicable to the design, manufacture and acceptance of check valve for steam piping system of which the mediums are fresh water, lubricating oil, fuel and temperature does not exceed 300??C.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 600-2008, General specifications for marine piping valves and fittings GB/T 699-1999, Quality carbon structural steels
GB/T 983-1995, Stainless steel covered electrodes
GB/T 1184-1996, Geometrical tolerancing--Geometrical tolerance for
features without individual tolerance indications
GB/T 1220-2007, Stainless steel bars
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 11698, Metal valves for use in marine flanged pipe systems -
Face-to-face and center-to-face dimensions
surface steel
Bushing Stainless steel 20Cr13 GB/T 1220-2007
4.2 Casting
The check valve castings per furnace shall be at least 3 test bars for
reference with furnace number. The shelf life shall not be less than 3a. 4.3 Strength
The check valve body strength, at 1.5 times design pressure of hydraulic pressure, shall have no leakage.
4.4 Sealability
The check valve is in the reverse state. There shall be no leakage between valve plate and valve seat when the sealing surface is reduced from 1.1 times the design pressure to 0.3 MPa.
4.5 Dimensional tolerance
4.5.1 The wall thickness tolerance of check valve shall meet requirements of 3.4 in GB/T 600-2008.
4.5.2 The unnoted linear dimensional tolerance of check valve shall meet requirements of grade m in GB/T 1804-2000.
4.5.3 The structural length tolerance of check valve shall meet requirements of GB/T 11698.
4.6 Geometric tolerance
The geometric tolerance of check valve shall meet requirements of grade K in GB/T 1184-1996.
4.7 Appearance
The check valve appearance shall meet requirements of 3.10 in GB/T
600-2008.
4.8 Mass
See Table 2, Table 3 for check valve mass. The positive deviation of its mass shall not exceed 4% of the theoretical mass.
4.9 Mark
The mark for check valve shall meet requirements of GB/T 3032.
8 Mark ??? ??? 4.9 5.8
NOTE ??? for inspection item required; - for inspection item not required. 6.2.3 Quantity of inspection sample
The sample quantity for check valve type inspection shall be 3.
6.2.4 Determination rules
When all inspection items of check value meet requirements, the type
inspection shall be qualified. If material has unqualified check valve, the type inspection shall be determined as unqualified. If there are other unqualified items, it shall double sampling for re-inspection. If the re-inspection meets requirements, the type inspection of check valve shall be determined as qualified. If there is still unqualified item in re-inspection, the type inspection of check valve shall be determined as unqualified.
6.3 Exit-factory inspection
6.3.1 Inspection items and sequence
The exit-factory inspection items and sequence of check valve shall be in accordance with the provisions of Table 5.
6.3.2 Inspection quantity
For inspection items of check valve, the material inspection shall be carried out in batches; other inspection items shall be carried out in products one by one.
6.3.3 Determination rules
The check valve of which all inspection items meet requirements shall be determined as qualified in exit-factory inspection. If the material of the check valve does not meet requirements, this batch shall be unqualified in
exit-factory inspection. For inspection of other item, if there is unqualified check valve, the re-inspection shall be carried out after rework. If the re-inspection meets the requirements, this check valve shall be determined as qualified in exit-factory inspection. If the re-inspection still does not meet requirements, this check valve shall be determined as unqualified in
exit-factory inspection.
7 Packaging and storage
7.1 Packaging
The packaging of check valve shall be carried out according to the provisions

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