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    AI Overview
    Valve face seal types vary from
    simple O-rings, X-rings, and U-cups for general use to specialized PTFE/PEEK seals, V-rings, and T-seals, plus metal/composite mechanical seal faces (carbon, ceramic, carbide), all designed for specific pressures, temperatures, and media, acting as static gaskets or dynamic seals on valve components like seats and stems. 
    Common Types by Shape & Function 
    • O-Rings: The most basic, a round elastomer compressed into a groove for static or dynamic sealing, simple and cost-effective.
    • X-Rings (Four-Lobed): An O-ring with an X-profile for lower friction and better sealing in dynamic/rotary use.
    • U-Cups: U-shaped, pressure-energized seals for stems or pistons, sealing from one direction.
    • V-Rings: V-shaped axial seals for high-speed dynamic applications, preventing contamination.
    • T-Seals: T-shaped, used with backup rings in high-pressure systems to prevent extrusion.
    • Spring-Energized Seals (AFCI/AFCE): Helical springs energize PTFE/PEEK seals for high-load static applications. 
    Common Types by Application/Mechanism 
    • Flange Seals: Gaskets like FF (Flat Face), RF (Raised Face), Ring Type Joint (RTJ) for pipe connections.
    • Mechanical Seals: Utilize rotating and stationary faces (e.g., carbon, ceramic) for demanding pump/valve shafts.
    • Slab Gate Valve Seals: Specific ID (Internal Diameter) and OD (Outer Diameter) face seals for gate valves, often PTFE-based.
    • Engine Valve Seals: Positive, umbrella, and deflector seals for guiding and sealing valve stems in engines. 
    Key Materials Used 
    • Elastomers: NBR, FKM (Viton), EPDM, Silicone for general use.
    • Plastics/Composites: PTFE (Teflon), PEEK, Glass-filled PTFE for chemical/high-temp resistance.
    • Hard Faces: Carbon, Ceramic, Tungsten Carbide for mechanical seals. 
    Choosing the right type depends on the valve's function (static vs. dynamic), operating pressure, temperature, and chemical compatibility with the media. 
    • Gate Valve Seat Seals Explained - Heshka Oil
      Feb 25, 2022 — ID and OD face seals are some of the most commonly replaced parts for FLS and FLS-R slab gate valves. They are used in...
      Heshka Oil
    • Types of Seals - Plast-O-Matic Valves, Inc.
      Intro to Plastic Valves: Seals. O-Rings. An O-ring is a round elastomeric ring. O-rings are ideally suited to be a compressed, sta...
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    • Seals for Valve Manufacturers - Arizona Sealing Devices
      Oct 7, 2024 — Common types of seals used in valve manufacturing include: * O-Rings. O-rings are round seals that fit into a groove be...
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    • Gate Valve Seat Seals Explained - Heshka Oil
      Feb 25, 2022 — ID and OD face seals are some of the most commonly replaced parts for FLS and FLS-R slab gate valves. They are used in...
      Heshka Oil
    • Face Materials | Types of Mechanical Seal Faces
      The most common types of seal faces are: Carbon, Ceramic, Ni-resist, 17-4, Silicon Carbide, Tungsten Carbide, GFPTFE (glass filled...
      www.mechanicalseals.net
    • Custom Face Seals | PTFE & PEEK | AFT Fluorotec
      Some types of face seals include: * **AFCI / AFCE Seals** These seals are energized with a tape wound helical spring and are suita...
      AFT Fluorotec
    • Types of Seals - Plast-O-Matic Valves, Inc.
      Intro to Plastic Valves: Seals. O-Rings. An O-ring is a round elastomeric ring. O-rings are ideally suited to be a compressed, sta...
      Plast-O-Matic Valves, Inc.
    • Seals for Valve Manufacturers - Arizona Sealing Devices
      Oct 7, 2024 — Common types of seals used in valve manufacturing include: * O-Rings. O-rings are round seals that fit into a groove be...
      Arizona Sealing Devices, Inc.
    • Valve Sealing for Industrial Success
      Dec 3, 2024 — Common Seal Types for Valve Applications * O-Rings are among the most commonly used seals in valve applications due to ...
      Global O-Ring and Seal
    • What valve seal do I need? A quick guide | Tameson
      Sep 4, 2020 — hi I'm Max today we're going to talk about different ceiling materials for solenoid valves. common ceiling materials ar...
      YouTube·Tameson
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    • 7 types of flange sealing surface: FF, RF, M, FM, T, G, RTJ
      Apr 19, 2021 — 7 types of flange sealing surface: FF, RF, M, FM, T, G, RTJ - tanghaivalve.
      tanghaivalve
    • Classifying Different Types of Seals
      Dec 8, 2021 — O-rings rotary seals radial seal. December 09, 2021. Depending on the direction that squeeze is applied to the cross se...
      Gallagher Fluid Seals
    • Types of mechanical seals | Meccanotecnica Umbra
      Nov 5, 2023 — There are basically three main types of mechanical seals: cartridge seals, component seals and air seals. Each of these...
      www.meccanotecnicaumbra.com
    • 11 Types of Valve Sealing Rings Introduction - Fleyenda Flow
      Oct 22, 2025 — 11 Types of Valve Sealing Rings Introduction * NBR Nitrile Rubber Sealing. Suitable for petroleum-based hydraulic oil,
      Fleyenda Flow
    • What Are The Three Types Of Valve Seals? - Knowledge
      Dec 28, 2023 — There are three types of valve seals that are commonly used in engines: positive seals, umbrella seals, and deflector ...
      Jitai Valve Group Co., Ltd.
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