ボンデッドシール（ダウティシール）

簡単な説明：

ボンドシールは、標準シール設計の改良版です。標準シールは、ボルトの負荷を均等に分散させるために使用されます。ボンドシールの利点は、成形されたエラストマーライニングで、ボルト穴からの流体の漏れを防ぐのに役立ちます。ボンドシールは、高圧用途で銅製ワッシャーに代わる一般的なシールです。台形のゴム製シーリング要素を金属ワッシャーの内側に接着して完成品を作ります。銅製ワッシャーで得られるよりも高いシーリング容量が高圧で要求される状況で使用されます。金属リングは、柔軟なリングの過剰な圧縮と押し出しを防ぎます。

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製品の詳細

製品タグ

ボンデッドシールの特性

.ldeal 圧力ガスケット

高圧・低圧での信頼性の高いシール、高温・低温対応

締め付け荷重を失わずにボルトトルクを低減金属リングがゴムの圧縮を防止

金属リングがゴムの圧縮を防ぎます

ボンデッドシールは、以下を含むさまざまな素材から選択できます。

.軟鋼 .ニトリル -30 °C ～ +100 °C

.軟鋼 .HNBR -20 °C ～ +150 °C

.ステンレス鋼 .バイトン -20°C ～ +200°C

.真鍮 .EPDM - 50 °C ～ +150 °C

.アルミニウム .シリコン -60°C ～ +250°C

当社は、標準およびセルフセンタリングスタイルの両方のボンデッドシールを以下の範囲で供給できます: メートル法「インチ*BSP、ドイツメートル法*フランスメートル法

製品詳細

GM500/WX/US/USIT 1

What is the difference between bonded seal and dowty seal?

A bonded seal and a Dowty seal are two names often used interchangeably to describe the same type of sealing component, but there are subtle differences in terminology and usage depending on context and industry. Both are composite seals designed to provide reliable sealing under high-pressure conditions, particularly in hydraulic and pneumatic systems.

What Is a Bonded Seal?

A bonded seal is a type of washer that consists of a metal ring (usually steel or stainless steel) with a vulcanized rubber sealing element (typically nitrile rubber or FKM) bonded to its inner diameter. This combination creates a durable and reusable sealing washer capable of withstanding high pressures and temperatures. When compressed between two surfaces—such as a bolt head and a housing—the rubber element deforms to fill any gaps, creating a leak-proof seal.

What Is a Dowty Seal?

The term Dowty seal originally referred to a brand name for bonded seals developed by the British engineering company Dowty Group. Over time, “Dowty seal” has become a generic term in many industries, especially in the UK and Commonwealth countries, to describe bonded seals in general. In practice, a Dowty seal is a type of bonded seal, but not all bonded seals are Dowty seals in the strictest branding sense.

Key Differences

特徴	ボンデッドシール	Dowty Seal
Definition	General name for metal-rubber sealing washers	Brand-originated term for bonded seals
材料	Metal (usually steel) + bonded rubber	Same materials
Usage Context	Used in various industries globally	Term often used in British/Commonwealth industries
Interchangeability	Fully interchangeable in function	Often considered the same as bonded seal

Applications

Both bonded and Dowty seals are widely used in:

Hydraulic fittings

Fuel systems

Oil drain plugs

High-pressure connections

Automotive and industrial machinery

While the bonded seal and Dowty seal perform the same function and have an identical structure, the difference lies mainly in naming and origin. “Dowty” is essentially a branded or colloquial term for a bonded seal, and in practical applications, they are functionally equivalent. Regardless of the name used, these seals are critical in preventing leaks in high-pressure systems and ensuring long-term mechanical integrity.

What does a bonded seal do?

A bonded seal is a highly reliable sealing device designed to provide a tight, leak-proof seal in high-pressure applications. It is composed of two main parts: a metal washer (typically made of stainless steel or carbon steel) and an elastomeric sealing ring (commonly made from materials like nitrile rubber, Viton, or silicone) that is bonded to the inner edge of the washer. The purpose of a bonded seal is to prevent fluid or gas from leaking around bolts, screws, and other fasteners in hydraulic, pneumatic, or mechanical systems.

How It Works

When a bonded seal is installed between two flat surfaces—usually where a bolt or threaded fitting is tightened—the metal washer provides structural support while the rubber insert compresses and deforms slightly. This creates a tight seal against both the mating surface and the fastener. The elasticity of the rubber compensates for minor imperfections on the sealing surfaces, ensuring a durable and leak-free connection.

Advantages of Bonded Seals

High Pressure Resistance: Bonded seals are ideal for high-pressure systems, often used in hydraulics and pneumatics.

Temperature and Chemical Resistance: Depending on the rubber material used (e.g., Viton for high temperature or chemical resistance), bonded seals can perform well under various environmental conditions.

Reusable in Some Cases: While the elastomer may degrade over time, the metal washer adds durability, and in less critical systems, the seals can sometimes be reused.

Easy to Install: Bonded seals can be quickly and easily installed without special tools, making them convenient for both OEM and maintenance applications.

Common Applications

Bonded seals are used across many industries, including:

Automotive: sealing engine bolts, oil drain plugs, and transmission parts.

Aerospace: ensuring leak-free connections in hydraulic and fuel systems.

Industrial Equipment: used in pumps, compressors, and machinery.

Hydraulic Systems: sealing between hydraulic fittings and threaded joints.

In summary, a bonded seal provides a secure and effective sealing solution for threaded components and fasteners exposed to fluids or gases. Its combination of metal strength and rubber flexibility allows it to perform reliably in demanding environments, making it an essential part of modern mechanical and hydraulic systems.

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