D373H Lug Butterfly Valve Hard Seal American Standard 

 First, use and characteristics 

 American Standard butterfly is our technical staff developed a new generation of high-performance products, the performance is already in the advanced level, widely used in low, medium, high, iron and steel metallurgy, petroleum, chemical, electric power for industrial pipe cut off or adjust the medium flow use. American Standard three-dimensional eccentric oblique conical valve seat sealing, the disc seal uses metal sheets stacked together with the elastic material, with embedded coincide with the valve seat in the butterfly board. Swing by pressing the disc seal, so the sealing surface friction is small, close is a function of the more closed more tightly, so that reliable sealing performance, open to ensure complete disengagement of the sealing surface to ensure that the sealing surface from damage. Structural characteristics of the United States ruled out the standard butterfly valve to open other types of bits and can not seal off the shortcomings, and in high-Shu under normal use, to overcome other types of valves used in high temperature due to thermal expansion and easy leakage faults. 
 Use of the media under the requirements of the Butterfly, the choice of the sealing surface of different materials to ensure the sealing surface wear resistance, erosion resistance, corrosion resistance, long life, more pressure solid. 

 Second, the use of standard 

 Design standard: API609-83 
 Flange Dimensions: ANSI B 16.5 
 Structure length: ANSI B 16.10-1992 
 Pressure test: API 598-82