Axial flow (AXIALFLOW) concept and design has been applied to the valve for over 100 years. Axial flow is a streamlined and evenly distributed free-flow path existing between the valve body and the housing. At present, the axial flow control valve is mainly used in the fields of water industry, natural gas, other liquids or gas control, the valve diameter from DN50 to DN2000mm, the pressure rating from PN10 kg to PN400 kg, can be equipped with hydraulic, electric or pneumatic actuators, and also Fully dependent on the working medium of self-operated control form, especially in large-caliber, high pressure differential and quick turn off and other occasions more and more widely used. The world famous manufacturer of axial flow control valve specially used in water industry mainly includes German VAG Company, German ERHARD (now TYCO) Company, American POLYJET (now WATTS) Company, American CLA-VAL Company and Israeli INBALL Company. The world's leading axial flow control valve manufacturers specializing in the natural gas industry are mainly Holland MOKVELD company, Germany RMG (now HONEYWELL) company, the United States DANIEL (now SPX) company, the United States WELKER company, the United States AMC company, the United States FISHER company Wait. Other control valve manufacturers that utilize axial flow design principles include COAX in Germany and NOREVA in Germany. Whether axial check valves, axial pressure relief valves or pressure relief valves, solenoids directly driven, compressed air directly driven or equipped with electro-hydraulic or pneumatic actuators, they perform exceptionally well at all industrial sites , Completed a number of other valve products can not be completed regulation and control work. For example, natural gas with large diameter and high pressure difference in natural gas transmission can only use pneumatic or electric axial flow control valves. All of these products used in China's natural gas transmission pipelines are imported while other types of products can not be used. Large differential pressure, large flow, large caliber, the other valve products can not complete the control work can only use the axial large caliber control valve, as well as direct electromagnetic and compressed air-driven axial flow control valve due to compact size, almost no Pressure loss, rapid switching, in the field of military and aerospace there are special areas of research almost no other valve access. Domestic research and development of axial flow control valve slow, the first by Wuzhong Instrument Factory in 2002 developed for the control of natural gas axial flow control valve, Neway Valve Co., Ltd. in Suzhou in 2009 also developed an axial stop Check valve, but other types and applications of the axial flow control valve is still blank.
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