This standard specifies the classification and labeling, requirements, test methods, inspection rules, marking and packaging of cast steel flanged stop valves with bellows (hereinafter referred to as stop valves) with flange connection dimension in accordance with those specified in GB/T 569 and GB/T 2501.
This standard is applicable to the design, manufacturing and acceptance of stop valve for the marine vapor, high-temperature oil, high-temperature water, vacuum, refrigerating and refrigeration equipment systems with nominal pressure not larger than PN25 and working temperature not higher than 250℃.
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 normative document (including any amendments) applies.
GB/T 569 Marine Pipe Flanges - Connection Dimensions and Mating Face
1 Scope
This standard specifies the classification and labeling, requirements, test methods, inspection rules, marking and packaging of cast steel flanged stop valves with bellows (hereinafter referred to as stop valves) with flange connection dimension in accordance with those specified in GB/T 569 and GB/T 2501.
This standard is applicable to the design, manufacturing and acceptance of stop valve for the marine vapor, high-temperature oil, high-temperature water, vacuum, refrigerating and refrigeration equipment systems with nominal pressure not larger than PN25 and working temperature not higher than 250℃.
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 normative document (including any amendments) applies.
GB/T 569 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB/T 584-2008 Marine Cast Steel Flanged Stop Valves
GB/T 600 General Specifications for Marine Piping Valves and Fittings
GB/T 699-1999 Quality Carbon Structural Steels
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 1958-2004 Geometrical Product Specification (GPS) - Geometrical Tolerance - Verification Prescription
GB/T 2501 Marine Pipe Flanges - Connection Dimensions and Mating Face
GB/T 3032 Marks for Marine Piping Valves and Fittings
GB/T 4238-2007 Heat-resisting Steel Plate, Sheet and Strip
GB/T 11698 Metal Valves for Use in Marine Flanged Pipe Systems - Face-to-face and Centre-to-face Dimensions
GB/T 12229-2005 General Purpose Industrial Valves - Specification of Carbon Steel Castings
GB/T 12777 General Specification for Metal Bellows Expansion Joints
CB/T 3927 Wall Thickness of Casting Body for Marine Valve
3 Classification and Labeling
3.1 Type
The types of stop valve are specified as follows:
a) Type A - through-type stop valve with flange connection dimension and sealing face in accordance with GB/T 569;
b) Type B - perpendicular-type stop valve with flange connection dimension and sealing face in accordance with GB/T 569;
c) Type AS - through-type stop valve with flange connection dimension and sealing face in accordance with GB/T 2501;
d) Type BS - perpendicular-type stop valve with flange connection dimension and sealing face in accordance with GB/T 2501.
Contents of CB/T 3945-2013
Foreword I
1 Scope
2 Normative References
3 Classification and Labeling
4 Requirements
5 Test Methods
6 Inspection Rules
7 Package and Storage
