This standard specifies the classification and labeling, requirements, test methods, inspection rules, marking, package and storage of marine forged steel male thread stop-check valves (hereafter referred to as stop-check valves).
This standard is applicable to the design, manufacturing and acceptance of stop-check valve for marine pipeline system with fuel oil, lubricating oil, fresh water, air and vapor with temperature not exceeding 250℃ as medium.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 600 General Specifications for Marine Piping Valves and Fittings
GB/T 699-1999 Quality Carbon Structural Steels
GB/T 700-2006 Carbon Structural Steels
GB/T 1220-2007 Stainless Steel Bars
GB/T 1958 Geometrical Product Specifications (GPS) - Geometrical Tolerance - Verification Prescription
GB/T 3032 Marks for Marine Piping Valves and Fittings
GB/T 9440-1988 Malleable Iron Castings
GB/T 17107-1997 Structural Steel Grades and Mechanical Property for Forgings
CB*56 The Flat Shoulder Threaded Joints of Tube
CB/T 3589-1994 Non-asbestos Gaskets and Fillers for Marine Valves
3 Classification and Labeling
3.1 Type
Stop-check valves are classified into the following two types:
Type A - through-type stop-check valve;
Type B - perpendicular-type stop-check valve.
