行业组件数据 · 2026

密封圈（O型圈）

O-rings are torus-shaped elastomeric seals used in pneumatic and hydraulic systems to prevent fluid leakage between mating surfaces in air valves.

技术定义与适配语境
典型 密封圈（O型圈） 会按材料、尺寸公差、适配关系和失效风险在 机械和设备制造 中评估。

O-rings are precision-engineered sealing components with a circular cross-section designed to fit into grooves and create a static or dynamic seal between two or more parts. In air valve applications, they prevent compressed air leakage around spools, shuttles, and ports by deforming under pressure to fill microscopic gaps. Their effectiveness depends on proper gland design, material compatibility, and installation.

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组件规格

定义
O-rings are precision-engineered sealing components with a circular cross-section designed to fit into grooves and create a static or dynamic seal between two or more parts. In air valve applications, they prevent compressed air leakage around spools, shuttles, and ports by deforming under pressure to fill microscopic gaps. Their effectiveness depends on proper gland design, material compatibility, and installation.
工作原理
O-rings function through elastic deformation and controlled compression. When installed in a gland (groove), they are compressed radially or axially, creating initial sealing contact. Under system pressure, the O-ring is forced against the low-pressure side of the groove, increasing sealing force proportionally to pressure (self-energizing). In dynamic applications (like spool valves), they maintain sealing through controlled friction and lubrication while accommodating minor movements.
材料
Common materials include Nitrile Rubber (NBR) for general pneumatic applications (-40°C to 120°Cpetroleum resistance)Fluorocarbon (FKM/Viton) for high-temperature/high-chemical resistance (-20°C to 200°C)Ethylene Propylene Diene Monomer (EPDM) for steam/water resistance (-50°C to 150°C)and Polyurethane (PU) for high wear resistance. Material selection depends on temperature rangemedia compatibility (airlubricants)and dynamic requirements.
Inner Diameter
2mm to 500mm
Compression Set
<25% (per ASTM D395)
Pressure Rating
Up to 40 MPa static, 20 MPa dynamic
Temperature Range
-40°C to 200°C (material dependent)
Hardness (Shore A)
70 to 90
Cross-Section Diameter
1.5mm to 10mm
标准
ISO 3601AS 568ADIN 3771JIS B 2401

行业分类与别名

密封圈（O型圈） 的常用贸易名称、技术标识和检索关键词。

O-ring sealspneumatic sealsair valve sealselastomeric sealsISO 3601Nitrile O-ringsFKM sealssealing componentsspool valve seals密封圈（O型圈）Seals (O-rings)机械和设备制造 密封圈（O型圈）

上级产品

该组件会出现在以下整机或工业产品中。

空气阀（滑阀/梭阀）
一种通过移动滑阀或梭阀机构来调节气动系统中气流方向的方向控制阀。
查看产品详情 ->

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Excessive clearance between mating parts->Extrusion - O-ring material forced into gap, causing permanent damage->Design glands with proper clearance (per ISO 3601), use backup rings for high pressure, specify appropriate hardness
High temperature or improper material selection->Compression set - O-ring loses elasticity and fails to rebound->Select materials with low compression set (e.g., FKM), ensure operating within temperature limits, consider energizers
Incompatible fluids or lubricants->Chemical degradation - swelling, cracking, or hardening->Verify chemical compatibility charts, use appropriate seals (e.g., EPDM for water, FKM for oils), test with actual media

工业生态与工程逻辑

兼容对象
Pneumatic spool valvesShuttle valvesAir cylindersPneumatic manifoldsCompressed air systems
可替换件
Parker HannifinFreudenberg Sealing TechnologiesTrelleborgSKFApple RubberGreene Tweed
0
Extrusion under high pressure
1
Compression set leading to leakage
2
Chemical degradation from incompatible media
3
Abrasion from poor surface finish
4
Installation damage during assembly

合规与检测

tolerance
ISO 3601-1 Grade N (normal) for general applications, Grade S (special) for precision applications. Dimensional tolerances typically ±0.10mm on cross-section, ±0.30mm on inner diameter.
test method
Pressure testing per ISO 228, compression set per ASTM D395, hardness per ISO 48, fluid resistance per ISO 1817, extrusion resistance per ISO 2230.

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采购评估维度

不是客户评论，也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例，不代表真实客户评分、具体国家买家反馈或实时询盘。

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常见问题

What causes O-ring failure in air valves?

Common failures include extrusion (excessive clearance), compression set (permanent deformation), chemical degradation (incompatible media), abrasion (poor surface finish), and installation damage (twisting, cutting).

How do I select the right O-ring material for pneumatic applications?

Consider operating temperature, media compatibility (compressed air may contain oil/water), dynamic/static application, pressure, and environmental factors (ozone, UV). NBR is standard for general pneumatics; FKM for high-temp or aggressive environments.

What is the proper gland design for O-rings in spool valves?

Glands should provide 15-30% cross-sectional compression, proper clearance to prevent extrusion, adequate volume to accommodate swell, and smooth surfaces (Ra < 0.8 μm). Follow ISO 3601-2 for dimensional standards.

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CNFX Industrial Component Index · 机械和设备制造

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