JB / T6439-2008 valve pressed steel castings magnetic particle inspection JB / T6440-2008 valve pressed steel castings Radiographic examination JB / T6899-1993 valve fire resistance test JB / T6902-2008 valve castings liquid penetrant inspection methods JB / T6903-2008 valve forgings ultrasonic inspection method 1 \ operation of the valve should be intact, and the bracket flange bolts complete Shanghai Guanlong valve Machinery Co., thread lossless, no loosening. 2. The handwheel missing Tianjin Tanggu Valve Co., Ltd., should be filled and not be able to replace with a wrench. 3, packing gland is not allowed skew or no pretension clearance. 4. If the valve using the environment is more severe, vulnerable to rain, snow, dust, sand and dirt contamination Shenzhen valves, you should install a protective cover for the valve stem. 5, the scale on the valve should remain complete, accurate, clear, valve seals, caps. 6, insulation jacket should be no dents, cracks. 13, the operation of the valve, to avoid its beat, or support heavy loads. Taiwan Toyama Valve Co., Ltd., the Hong Kong _ valve (Online) _ Shenzhen valve provided by the Dongguan Science and Technology Co., Ltd., the Hong Kong valve. 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.