You can choose between two main categories when selecting valves and seats.<\/p>\n\n\n\n Soft-seated designs use materials like rubber or PTFE that compress when the disc closes. This compression creates a bubble-tight seal with zero leakage. The seat embeds into the valve body; you can find bonded, press-fit, or lock-ring options.<\/p>\n\n\n\n These work best in concentric butterfly valves where the disc pushes into the seat. But also, this contact causes wear, which means you’ll replace the seat more often than metal options.<\/p>\n\n\n\n Metal seats use hardened surfaces for both the disc and seat. They rely on machining and a conical contact angle rather than compression to create the seal. It means the disc and seat make metal-to-metal contact at an angle.<\/p>\n\n\n\n You’ll find these in double-offset and triple-offset designs. The offset reduces the time the disc spends rubbing against the seat during operation. This design extends working life in harsh conditions.<\/p>\n\n\n\n Different materials suit different applications.<\/p>\n\n\n\n Several material options are available for soft seats, including<\/p>\n\n\n\n EPDM (Ethylene Propylene Diene Monomer)<\/strong> stands up to acids, alkalines, and weather elements. The material can handle water, alcohols, ketones, and chlorine solutions. The temperature range runs from -30\u00b0F to 225\u00b0F. You’ll see EPDM in HVAC systems and water treatment. However, it doesn’t work with petroleum-based oils or hydrocarbon solvents. It means you need to avoid EPDM if your system handles petroleum products.<\/p>\n\n\n\n BUNA-N (Nitrile Rubber)<\/strong> offers abrasion resistance and tensile strength. The material can handle hydraulic fluids, water, petroleum oils, and fuels. It works from 0\u00b0F to 180\u00b0F, with heat resistance up to 225\u00b0F. This fits automotive and industrial applications where petroleum products flow through. But also, it fails when exposed to acetones, ketones, or ozone.<\/p>\n\n\n\n PTFE (Teflon)<\/a><\/strong> provides low friction and chemical resistance. It works from -50\u00b0F to 400\u00b0F, making it suitable for both hot and cold applications. Chemical processing and oil and gas operations use PTFE seats because of this temperature range. The material can also insulate well, so it fits electrical applications. If you need to understand similar sealing materials, check our ball valve seat material guide<\/a>.<\/p>\n\n\n\n VITON (Fluorocarbon)<\/strong> resists heat and corrosion better than most elastomers. The material can handle mineral acids and hydrocarbon products. The working range spans -20\u00b0F to 300\u00b0F. This works with petroleum oils, chlorinated hydrocarbons, and mineral acids. However, it doesn’t seal with water or steam. That can limit its use in certain systems.<\/p>\n\n\n\n Here’s a comparison guidance of these butterfly valve seats material, please check:<\/p>\n\n\n\n CTGV provides a metal seated butterfly valve with seats made from stainless steel or alloys. These materials handle temperatures above 400\u00b0F and high-pressure applications where soft materials fail. The seats undergo machining to ensure contact angles for sealing.<\/p>\n\n\n\n Metal options include stainless steel grades like 316 for corrosion resistance. You also have alloys like Inconel or Hastelloy that suit corrosive environments. But also, these premium alloys cost more than standard stainless steel.<\/p>\n\n\n\n\n\n![\"\"](\"https:\/\/www.tgvalve.com\/wp-content\/uploads\/2025\/12\/Butterfly-Valve-Seat-Types-and-Selection-Guide-1.webp\")
<\/figure>\n\n\n\nSoft Seated Valves<\/strong><\/h3>\n\n\n\n
Metal Seated Valves<\/strong><\/h3>\n\n\n\n
Material Options for Butterfly Valve Sealing Seat<\/strong><\/h2>\n\n\n\n
Soft Seat Materials<\/strong><\/h3>\n\n\n\n
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Metal Seat Materials<\/strong><\/h3>\n\n\n\n