2016年6月30日星期四

Globe Valve Scope Specified In BS 1873

BS 1873- Specification for Steel globe and globe stop and check valves (flanged and butt-welding ends) for the petroleum, petrochemical and allied industries

This British Standard specifies requirements for cast or forged carbon and alloy steel outside screw and yoke globe valves and globe stop valves and check valves, straight pattern, angle pattern and (oblique) Y pattern, with flanged or butt-welding ends in nominal sizes within the range of 15 mm to 400 mm (1/2 in to16 in) and Classes150 to2500. This standard can also be used as a general guide where valves of material composition outside the scope of section three of this standard are required as, for example, for use in highly corrosive services or environments or for low temperatures (see clause37). The standard can be adapted to apply to valves with needle type seats in15mm (1/2 in) an 20 mm (< in) nominal sizes which will meet all requirements of this standard, except that the valve seat bore is reduced and the needle point may be either integral with or loose on the stem.

2. Pressure classification
This standard applies to valves of the following pressure class designations: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500 and Class 2500. The numerals in these class designations represent the primary service pressure ratings of the valves in pounds-force per square inch.

3. Pressure/temperature ratings
The pressure/temperature ratings applicable to valves specified in this standard shall be in accordance with Tables PE-1 to PE-12 of AppendixA of BS1560-2:1970 for the particular shell material specified. There is, however, a temperature restriction on soft seals and on certain trim materials (see18.3 and30.5)

4. Nominal sizes 
This standard covers valves of the following nominal sizes: 
1/2 in-16 in, DN 15-DN 400 mm

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