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Butt Weld Connection
The buttwelding ends are prepared by beveling each end of the valve to match a similar bevel on the pipe. The
two ends are then butted to the pipeline and joined with a full penetration weld.
This type of joint is used on all
valve styles and the end preparation must be different for each schedule of pipe. These are generally furnished
for control valves in sizes 2-1/2-inch and larger.
Care must be exercised when welding valve bodies in the
pipeline to prevent excessive heat transmitted to valve trim parts. Trims with low-temperature composition materials
must be removed before welding.
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Standards
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ANSI/ASME B16.25-1997
Buttwelding Ends
Covers the preparation of butwelding ends of piping components to be joined into a piping system by welding.
IEC 60534-3-3 Ed. 1.0 b:1998
EN 60534-3-3
JIS B 2005-3-3:2005
Industrial-process control valves - Part 3-3: Dimensions End-to-end dimensions for buttweld, two-way, globe-type, straight pattern control valves
Specifies end-to-end dimensions for given nominal sizes and pressure ratings of buttweld, two-way, globe-type, straigth pattern control valves for nominal
sizes DN 15 through DN 450. Aids users in their piping design by providing normalized dimensions of buttweld end control valves.
ANSI/ISA 75.08.04-2001
Face-to-Face Dimensions for Buttweld-End Globe-Style Control Valves (Class 4500) (Formerly ANSI/ISA 75.14-1993)
This standard applies to buttweld-end globe-style control valves, sizes 1/2 inch (15mm) through 8 inches (200 mm), having top and cage guiding.
ANSI/ISA S75.15-1994
Face-to-Face Dimensions for Buttweld-End Globe-Style Control Valves (ANSI Classes 150, 300, 600, 900, 1500 and 2500)
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