Other claim 1, the valve assembly is completed with a nitrogen purge at least one minute. 2, air tightness test must be with pure nitrogen. 3, airtightness test after passing the encapsulated power station valve, sealing cap with a clean polyethylene, polyethylene cap before the application of an organic solvent soaked wipe clean. 4, and then vacuum sealed. 5, the final packing. 6. During transport to take measures to ensure that the encapsulation is not damaged. Public GB / T1047-2005 piping element DN GB / T1048-2005 piping components nominal GB / T11698-2008 Marine flanged metal valve structure length GB / T12220-1989 Universal Valve logo GB / T12221-2005 flange connection metal valve structure length GB / T12222-2005 Multi-turn valve actuator means connecting GB / T12223-2005 part of the rotary valve drive connected to a steam valve assembly, the valve out of Hong Kong (certified), Guangzhou, Dongguan Ming valve provided by the Port Valves Technology, Inc. . Valve Co., Ltd., Dongguan Ming Kong (www.gdmgfm.com) is Dongguan, butterfly leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Ming Kong valve leadership with the staff warmly welcome all inquiries negotiations to create a better valve out of Hong Kong in the future.