Quick couplings

Purge Line Cupla

The Nitto Kohki Purge Line Cupla is a specialised quick coupling in brass with NBR seal designed for purge-line applications. The current range covers one type: RE-PV-30, nominal size 30. This coupling is designed for applications where compressed-air lines and connected components must be purged or evacuated in a controlled manner without interrupting the main line.

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Quick connect coupling Purge Line Cupla RE-PV-30, brass - Nitto Kohki 329806609
€320.34

Buying guide

How to choose Purge Line Cupla

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

Technical features

⚙ Brass construction - corrosion-resistant for compressed air and compatible purge media

✓ NBR seal - sealed for purge-line service

↕ Nominal size 30 - designed for larger purge volumes and line cross-sections

✦ Type RE-PV-30 - specialised purge-line design in the established Nitto Kohki coupling system

Type overview

Type	Nominal size	Material	Seal	Function
RE-PV-30	30	Brass	NBR	Purge line coupling

Typical applications

Typical applications: Purging of compressed-air lines during commissioning and maintenance, evacuation of line sections before cleaning procedures, applications in semiconductor, optics, and metrology with requirements for particle-free piping systems, and processes where residual gases or contaminants must be removed from pneumatic circuits.

FAQ

Frequently asked questions about Purge Line Cupla

What are Purge Line Cupla quick couplings and which industrial applications require them?

Purge Line Cupla quick couplings from Nitto Kohki represent specialized pneumatic connectors designed for applications requiring controlled media purging and venting operations. These brass-bodied couplings with NBR sealing are primarily utilized in semiconductor manufacturing, pharmaceutical production lines, and precision assembly automation where contamination control is critical. The RE-PV-30 series enables rapid connection and disconnection while maintaining system integrity during purge cycles. Industries including electronics manufacturing, cleanroom operations, and medical device production rely on these couplings for their ability to provide leak-tight sealing during both operational and maintenance phases.

What technical specifications determine the selection of Nitto Kohki Purge Line Cupla couplings?

Selection of Purge Line Cupla couplings depends on operating pressure ratings typically ranging from 0.2 to 1.0 MPa, port size compatibility with standard pneumatic tubing, and material compatibility requirements. The brass construction with NBR sealing elements provides chemical resistance to standard pneumatic media including compressed air, nitrogen, and inert gases. Connection thread specifications following ISO 228 or NPT standards ensure proper system integration, while the coupling's flow coefficient determines pressure drop characteristics. Temperature operating range typically spans -10°C to +60°C for NBR seal variants, with media filtration requirements of ISO 8573 Class 3 or better for optimal seal performance.

Which international standards and certifications apply to Purge Line Cupla pneumatic couplings?

Purge Line Cupla couplings manufactured by Nitto Kohki comply with ISO 4414 pneumatic system safety standards and ISO 5675 quick coupling performance requirements for industrial applications. The brass materials conform to EN 12165 specifications for copper alloys in fluid handling systems, while NBR elastomer seals meet DIN 3771 dimensional standards and ISO 3601 O-ring groove specifications. Pressure vessel compliance follows EN 809 safety requirements for pneumatic equipment, and electromagnetic compatibility aligns with EN 61000 standards for industrial environments. Quality management certification under ISO 9001 ensures consistent manufacturing processes and dimensional accuracy across production batches.

How do different Purge Line Cupla variants differ in terms of construction and application suitability?

The RE-PV-30 Purge Line Cupla variant features brass body construction with NBR sealing specifically engineered for standard pneumatic applications requiring periodic system purging and media changeover capabilities. Different port configurations accommodate various tubing sizes from 6mm to 12mm outer diameter, while valve mechanism designs vary between manual operation and automatic shut-off functionality. Material combinations including stainless steel bodies with FKM seals are available for aggressive media applications, providing enhanced chemical resistance compared to standard brass-NBR configurations. Operating pressure ratings distinguish variants, with standard versions rated to 1.0 MPa and high-pressure variants capable of 1.6 MPa continuous operation.

What installation requirements and system compatibility considerations apply to Purge Line Cupla couplings?

Purge Line Cupla installation requires proper thread engagement following ISO 228-1 parallel thread specifications or NPT tapered thread standards depending on system configuration, with thread sealant application meeting DIN EN 751-3 requirements for pneumatic systems. System compatibility demands compressed air quality meeting ISO 8573-1 Class 3:4:3 minimum standards to prevent premature seal degradation and ensure reliable coupling operation. Connection torque specifications typically range from 15 to 25 Nm for brass fittings, while system pressure testing should follow EN 809 procedures at 1.5 times working pressure. Ambient temperature conditions must remain within -10°C to +60°C operational limits, and installation orientation should accommodate proper drainage of condensate from the coupling body.

What safety ratings and environmental specifications characterize Purge Line Cupla performance?

Purge Line Cupla couplings typically achieve IP54 ingress protection rating against dust and water spray when properly installed, making them suitable for industrial workshop environments and outdoor pneumatic installations. Operating pressure range spans 0.2 to 1.0 MPa continuous duty with proof pressure testing at 1.5 MPa according to ISO 4414 safety standards for pneumatic equipment. Temperature performance covers -10°C to +60°C for NBR seal variants, while brass body construction provides corrosion resistance meeting EN 12165 specifications for industrial atmospheres. Safety factor calculations follow EN 809 requirements with minimum 4:1 burst pressure ratio, and cyclic pressure testing validates 1 million cycle minimum service life under normal operating conditions.

What maintenance intervals and inspection procedures ensure optimal Purge Line Cupla service life?

Purge Line Cupla maintenance requires quarterly visual inspection of coupling body and seal integrity, with annual replacement of NBR sealing elements in high-cycle applications exceeding 10,000 connections per year. Service life typically extends 5-7 years under normal operating conditions when compressed air quality meets ISO 8573-1 Class 3:4:3 standards and operating temperatures remain within -10°C to +60°C limits. Preventive maintenance includes semi-annual lubrication of moving parts with ISO VG 32 pneumatic oil and torque verification of threaded connections to manufacturer specifications. Pressure testing should occur annually at 1.1 times working pressure to verify seal integrity, while coupling replacement becomes necessary when leakage exceeds 1% of flow rate or connection force increases beyond normal operation parameters.