What does it mean short or long pattern in a valve? there are some reference in ASME B16.10 but I can't find there the difference between them.Instrumentation Ball Valves

There is a difference.Needle & Gauge Valves

Short and long ar referring to standardized building lengths. For European this would typically be as an example F4 and F5 lengths according to former DIN 3202, F4 (short) now series 14, EN 558-1.Instrument Manifolds

Go to the homepage and datasheets from a good supplier in your country/state and you will find the corresponding lengths and standards.And the difference is the length. Those lengths are tabulated in B16.10.

Some folks like to buy the length that matches a standard gate valve.Regulators This provides greater options without revising the piping should you need to replace the valve in the future. Also, if you are replacing an existing gate with a ball valve, buy the pattern for the gate valve length.

The main difference to be aware of regarding short and regular pattern plug valves is that the short pattern plug valve produces much more pressure drop than the regular pattern plug valve.  This may also be true with short pattern ball valves. Globe Valves  It is something you should check.

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