GB / T12230-2005 General valves austenitic steel castings JB / T5300-2008 industrial valves material selection guidelines JB / T6438-1992 valve sealing surface plasma arc welding technical requirements JB / T7248-2008 valve with low temperature steel castings PAW technical conditions JB / T7744-1995 valve sealing surface surfacing alloy powder according to the structure characteristic structural features of the valve structure of the valve is based on the closing member relative to the direction of movement of the seat can be divided into: (1) gate-shaped cross-section: close member along the seat centers; such as the cut-off valve (2) tap and ball: ball closure member is a plunger or Taiwan Toyama Valve Co., rotating around the center line itself; if plug, ball valve (3) gate shape: Close member is moved along the vertical seat centers; such as gate valves, gates and other (4) swing shape: Close members around the outside of the seat axis; as swing check valves, etc. (5) butterfly: Close the disc member around the axis of rotation of the valve seat; such as butterfly valve, butterfly valve, etc. (6) spool shape: the closure member in the direction perpendicular to the slide channel. The sliding Taiwan Toyama Valve Co., Ltd., the Hong Kong valves (online consultation), the 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.