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In-Line Purge Adapter

The Nitto Kohki In-Line Purge Adapter is a steel purge adapter with NBR seal that is installed directly in line in a compressed-air circuit, allowing targeted flushing of defined sections. The range covers four types (PAD-3FM, PAD-4FM, PAD-6FM, PAD-8FM) in nominal sizes 3, 4, 6, and 8. The adapters allow removal of moisture, particles, or residues from specific line sections without full disassembly.

4 items
1 manufacturer
Net prices plus VAT

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Purge adapter Purge Adapter PAD-3, steel - Nitto Kohki 599865103
€148.06
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Purge adapter In-Line Purge Adapter PAD-6FMSTEELNBR, steel - Nitto Kohki 599865105
€169.81
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Purge adapter In-Line Purge Adapter PAD-4FMSTEELNBR, steel - Nitto Kohki 599865104
€149.20
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Purge adapter In-Line Purge Adapter PAD-8FMSTEELNBR, steel - Nitto Kohki 599865106
€176.75

Buying guide

How to choose In-Line Purge Adapter

What matters when choosing: properties, comparison and typical applications.

Technical features

⚙ Steel body, NBR seal - for compressed-air and pneumatic systems in industrial service

✓ Nominal sizes 3, 4, 6, 8 - four types for common hose and pipe sizes

↕ Inline design - direct integration into the line run without deflection

✦ Targeted section purging - flush line sections without full disassembly

Type overview

Type	Nominal size	Material	Seal
PAD-3FMSTEELNBR	3	Steel	NBR
PAD-4FMSTEELNBR	4	Steel	NBR
PAD-6FMSTEELNBR	6	Steel	NBR
PAD-8FMSTEELNBR	8	Steel	NBR

Typical applications

Typical applications: Cleaning and flushing of compressed-air line sections during plant maintenance, removal of condensate and particles from pneumatic systems, preparation of lines for leak testing, and purge operations in food, medical, and cleanroom technology.

FAQ

Frequently asked questions about In-Line Purge Adapter

What is an in-line purge adapter and where is it used in industrial pneumatic systems?

An in-line purge adapter is a pneumatic coupling component designed to facilitate the removal of air bubbles, moisture, and contaminants from pressurized air lines during system commissioning and maintenance operations. These adapters are primarily deployed in automotive manufacturing facilities, food processing plants, pharmaceutical production lines, and general industrial automation systems where air quality and system cleanliness are critical. The Nitto Kohki in-line purge adapters feature steel construction with NBR sealing elements, providing reliable performance in applications requiring periodic system purging without disconnecting main air supply lines.

What are the key technical specifications to consider when selecting an in-line purge adapter?

Critical selection parameters for in-line purge adapters include port size compatibility, material construction, and sealing element specifications based on operating conditions. The Nitto Kohki PAD series offers port sizes ranging from 3mm to 8mm, with steel body construction providing durability in industrial environments operating up to 10 bar working pressure. NBR sealing elements ensure compatibility with compressed air, nitrogen, and inert gas applications while maintaining leak-tight performance across temperature ranges of -20°C to +80°C. Connection thread specifications and flow coefficient values determine system integration compatibility and purging efficiency.

Which international standards apply to in-line purge adapters in pneumatic systems?

In-line purge adapters must comply with ISO 4414 for pneumatic fluid power systems safety requirements and ISO 5598 for fluid power systems component terminology and definitions. European installations require conformity to EN 983 safety requirements for fluid power systems and equipment, while pressure vessel applications may need compliance with EN 13480 for metallic industrial piping. The steel construction and NBR sealing materials in Nitto Kohki adapters meet DIN 3489 specifications for pneumatic coupling materials and DIN 53505 standards for elastomer hardness verification, ensuring reliable performance in regulated industrial environments.

What are the differences between PAD-3FMSTEELNBR, PAD-4FMSTEELNBR, PAD-6FMSTEELNBR, and PAD-8FMSTEELNBR variants?

The primary differentiation between Nitto Kohki PAD series variants lies in their port diameter specifications and corresponding flow capacity ratings. PAD-3FMSTEELNBR provides 3mm internal diameter for low-flow applications, while PAD-4FMSTEELNBR, PAD-6FMSTEELNBR, and PAD-8FMSTEELNBR offer progressively larger 4mm, 6mm, and 8mm diameters respectively for higher flow rate requirements. All variants share identical steel body construction with NBR sealing elements, but larger diameters enable faster purging cycles and reduced pressure drop across the adapter during system evacuation procedures.

What installation requirements and system compatibility considerations apply to in-line purge adapters?

In-line purge adapters require installation in horizontal or vertical orientations with adequate clearance for coupling engagement and purging valve operation. System compatibility depends on thread specifications, with standard metric and BSP threading available to match existing pneumatic infrastructure and ISO 228-1 parallel thread requirements. The steel construction ensures compatibility with standard compressed air systems, while NBR sealing elements provide chemical resistance to synthetic lubricants and pneumatic system additives commonly used in industrial applications. Installation torque specifications typically range from 15-25 Nm depending on adapter size and thread configuration.

What safety ratings and operating parameters apply to steel in-line purge adapters?

Steel in-line purge adapters with NBR sealing elements typically operate within pressure ratings up to 16 bar maximum working pressure and temperature ranges from -20°C to +80°C for standard industrial compressed air applications. Safety factors comply with ISO 4414 requirements, incorporating minimum 4:1 safety margins against ultimate tensile strength of steel components. IP54 protection rating provides dust and moisture ingress protection suitable for typical pneumatic cabinet installations, while the non-sparking steel construction ensures compatibility with general industrial environments not requiring ATEX explosion-proof certification.

What maintenance schedule and service life expectations apply to in-line purge adapters?

In-line purge adapters require visual inspection every 6 months for seal integrity and coupling mechanism wear, with complete seal replacement recommended every 24 months or 10,000 operating cycles under normal industrial conditions. The steel body construction provides extended service life exceeding 100,000 coupling cycles when operated within specified pressure and temperature limits, while NBR sealing elements maintain leak-tight performance for approximately 50,000 cycles before requiring replacement. Preventive maintenance includes quarterly verification of coupling retention force and annual pressure testing at 1.5 times working pressure to ensure continued safety compliance per ISO 4414 standards.