First, the standards and specifications:
Inspection and test: API598, JB/T9092;
Design and manufacture: API594, API 6D, JB/TB8937;
Face to face and end to end: API594, API6D, DIN3202, JB/T8937;
Pressure-temperature rating: ASME B16.34, DIN2410, HG20625, SH3406, JB/T74;
Pipe flange: HG20592-20635, ASME B16.5, DIN2543-2548, GB/T13402, API605.
Second, the structural characteristics:
Applicable for and easily installed for vertical or horizontal pipelines;
Quick valve disc closedown, low water hammer pressure;
Smooth flow passageway and small fluid resistance;
Narrow valve travel and small closedown impact;
Short structural length, Low volume, light weight;
Flexible action and good sealing performance;
Long service life and good reliability.
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