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Dixon Valve & Coupling Company, LLC [1] is a manufacturer and supplier of hose fittings and accessories. The company, often referred to as just Dixon, offers products for fire protection, food processing, dairy processing, beverage and brewery operations, industrial manufacturing, mining, construction, chemical processing, petroleum processing and refining, oilfields, mobile tankers and ...
In 1943 Dr Olaf George Dixon of ICI applied for a patent of a new product for column distillation. [1] He used stainless steel mesh instead of sheet steel in the Lessing ring in order to improve the pressure drop of the packed column (in fact, they were called "wire gauze Lessing rings" in a 1949 publication [2]).
It has quarter-turn closing and is sexless (symmetrical). It may be fabricated from aluminum, stainless steel, brass or polypropylene. The standard for this kind of coupling is EN14420-8/NF E 29-572, and there is a special standard DIN14420-8 for unique assemblies with ferrule and safety clamp.
ASTM A733-03 Standard Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples. ASTM B687-99(2005)e1 Standard Specification for Brass, Copper, and Chromium-Plated Pipe Nipples. ASME B1.20.7 Hose Coupling Screw Threads, Inch.
Dixon rings have a similar design to Lessing rings. They are made of stainless steel mesh, giving Dixon rings a low pressure drop and after pre-wetting. Dixon rings have a very large surface area, which increases the rate of mass transfer. Dixon rings have a large liquid hold up, a low pressure drop and a large surface area, and have a high ...
Press fittings with appropriate and region-specific certification may be used for gas lines. Stainless steel and carbon steel press fittings can withstand up to 16 bars of pressure. A disadvantage of press fittings is the dead space between the pipe and the fitting, which can possibly rule out use for beverage and food applications.
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