I. Valve End Connections
What type of ends are specified for valves with a size up to 2″?
Explanation: Valves of size up to 2″ shall have Socket-welded (SW) ends.
II. Dual Plate Check Valves and Butterfly Valves
What type of connection is recommended for Dual Plate check valves and butterfly valves up to 24″?
Explanation: Dual Plate check valves and butterfly valves up to 24″ shall be of lug type.
III. Face to Face / End to End Dimension
What standards should the Face to Face / End to End dimension of valves conform to?
Explanation: The Face to Face / End to End dimension of valves shall conform to ASME B16.10 to the extent covered, and for valves not covered, reference shall be made to BS EN 12627 and/or the manufacturer’s drawings.
IV. Valve End Connections
What should the flange/weld ends of the valve be in accordance with?
Explanation: Flange/weld ends of the valve shall be as per the corresponding Flange/Fitting ends of the piping class, unless otherwise specified.
V. Pressure-Temperature Rating
What standard is referenced for the pressure-temperature rating of flanged and butt-welding end valves?
Explanation: The pressure-temperature rating for flanged and butt-welding end valves shall be as per ASME B16.34, except for ball, plug, and butterfly valves. For these valves, refer to the table for the Pressure-Temperature rating for Ball, Plug, and Butterfly valves.
VI. Valve Body Wall Thickness
What should be the wall thickness of the valve body at different locations as per ASME B16.34?
Explanation: The wall thickness of the valve body at different locations should not be less than as calculated as per B16.34.
VII. Valve Service Class for Hydrogen
What type of ends are specified for valves in 900#-and above Hydrogen service class?
Explanation: In 900#-and above Hydrogen service class, all valves are specified to have Butt-welded (BW) ends.
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