6 Tips to Choose a Qualified Sanitary Valve | SIMPLE VALVES BLOG

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• 304/304L

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  The AISI 304 is an austenitic stainless-steel line that was first formulated to be used in wrought products. The UNS number of this AISI designation is S. In addition, the British Standard and French (AFNOR) designations for the material are 304S15 and Z7Cn18-09 respectively.

  The 304 and 304L alloys are extremely similar except for a defining aspect: the carbon percentage. The maximum carbon percentage of 304 (SS) is 0.08% whereas, for the 304L alloy, it’s only 0.03%. Traditionally, the “L” of 304L is interpreted as “extra low” for the low presence of carbon.

• 316/316L

  Like 304, the AISI 316 is an austenitic stainless steel line. However, unlike 304, the cells of 316 are face centered cubic, which makes the material more durable than many of its kind. In the annealed or “soft” condition, 316 is non-magnetic. The material can be hardened only through cold working. To make it more resistant to corrosion, especially, corrosion influenced by chloride, molybdenum has been added to its construction.

  The other variant, the 316L alloy, is even more resistant to corrosion when used in welded structures. The difference between the two alloys again comes down to their carbon levels. The welding-suitable AISI 316L has a maximum carbon level of 0.03% whereas 316’s carbon level ranges around the medium.

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The most frequently used rubber for technical applications is NBR, thanks to its high resistance against oil, grease and other such hydrocarbons. Capable of withstanding temperature as high as 230 °F, NBR is also resistant against nitric acid and diluted lye. However, it is affected by ozone and hence exposure to ultraviolet rays can be detrimental.

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Short for Ethylene Propylene, EPDM is resistant against most materials used in the manufacturing of food products. In addition, it’s also resistant against high temperature (about 300 °F). For these two reasons, EPDM is vastly popular in the food industries. However, it does have a pitfall that cuts that advantage quite short. While resistant to ozone, EPDM isn’t durable at all against organic or non-organic hydrocarbons like fat and oil.

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Silicone is the most temperature-flexible material that can be used in the making of seats and seals. The material can retain its elasticity when placed anywhere between -80 °F and a tremendous 450 °F. Silicone is resistant against most common detrimental elements except for acids, undiluted lye and steam, which can actually destroy a silicone based rubber. However, its ozone resistance is pretty high.

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When rubber based seals need to endure high temperature and silicone isn’t an option, FPM, which can stand up to 400 °F, is the obvious choice. It’s strong against ozone and chemicals but weak against alcohol, acid, steam and lye.

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A synthetic fluoropolymer of tetrafluoroethylene and a high-molecular weight-compound of fluorine and carbon, polytetrafluoroethylene (PTFE) is a hydrophobic fluorocarbon solid, which means it’s resistant against all kinds of water and water-based wetness. Its coefficient of friction is one of the lowest displayed by any solid.

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