Flanged disc double isolation shut-off valve

1. the design and manufacture of valves are carried out according to the JB/T7747-2006 standard.
2. the inspection and acceptance of valves shall be carried out according to the standard requirements of API598.
3. flange connection size ASME B16.5 HG/T20615 standard requirements.
4. the strength test of the valve is carried out by hydraulic pressure test at 1.5 times the nominal pressure.