Quick couplings

Purge HI Cupla

The Nitto Kohki Purge HI Cupla is a quick-release coupling with an integrated purge function that controllably vents residual line pressure during disconnection, preventing compressed air or hydraulic fluid spray when uncoupling. The range includes socket types in brass (PV-x0SM) and steel (PV-x0PH, PV-65PN, PV-85PN) in nominal sizes 20, 30, 40, 65, and 85, plus purgeable return units PVR-400 to PVR-800 in brass/zinc in three connection forms (SH, SM, SF).

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Buying guide

How to choose Purge HI Cupla

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

Technical features

✓ Purge function - Controlled venting of residual line pressure during disconnection prevents fluid or air spray

⚙ Brass and steel - PV sockets in brass (NBR) for pneumatics, plugs in steel for mechanically stressed connections

↕ Nominal sizes 20-85 - Wide range for hose connections from small to large nominal bore

⬡ PVR return units - PVR-400/600/800 (brass/zinc, NBR) as purgeable sockets for larger nominal bores

PV and PVR series

Series	Types	Material	Seal	Nominal sizes
PV (socket)	PV-20SM to PV-600SM	Brass	NBR	20, 30, 40, 400, 600
PV (plug)	PV-20PH to PV-85PN	Steel	NBR	20, 30, 40, 65, 85
PVR (socket)	PVR-400SH/SM/SF to PVR-800SH/SM/SF	Brass/Zinc	NBR	400, 600, 800

Typical applications

Typical applications: Compressed-air connections on injection moulding machines and hydraulic presses where residual line pressure must be managed during tool changes, pneumatic hose connections in paint spray booths (avoiding paint drops), food machinery pneumatics without uncontrolled blasting, and hose disconnection points in the chemical industry.

FAQ

Frequently asked questions about Purge HI Cupla

What are Nitto Kohki Purge Hi-Cupla quick couplings and what industrial applications use them?

Nitto Kohki Purge Hi-Cupla quick couplings are specialized pneumatic disconnects designed for applications requiring complete air line evacuation and contamination prevention during coupling separation. These couplings incorporate a purge valve mechanism that automatically expels residual compressed air and potential contaminants from both coupling halves upon disconnection. Primary applications include semiconductor manufacturing clean rooms, pharmaceutical production lines, food processing pneumatic systems, and precision assembly automation where cross-contamination must be eliminated. The purge function prevents particle migration between different process zones and maintains system cleanliness critical for ISO 14644 cleanroom classifications and HACCP food safety protocols.

What are the key technical selection criteria for Purge Hi-Cupla pneumatic quick couplings?

Critical selection parameters for Purge Hi-Cupla couplings include operating pressure rating typically ranging from 0 to 10 bar working pressure, connection thread specifications following ISO 228 parallel or ISO 7 tapered standards, and bore diameter options from 6mm to 25mm for flow capacity matching. Material compatibility encompasses nitrile rubber seals for general compressed air, fluorocarbon seals for chemical resistance, and stainless steel bodies for corrosive environments. Flow coefficient (Cv) values determine pressure drop characteristics, while purge volume specifications indicate the air quantity expelled during disconnection. Temperature rating spans -20°C to +150°C for standard versions, with specialized variants extending to +200°C for high-temperature pneumatic applications.

Which international standards and certifications apply to Nitto Kohki Purge Hi-Cupla quick couplings?

Nitto Kohki Purge Hi-Cupla couplings comply with ISO 4414 pneumatic fluid power standards for system design and safety requirements, ensuring proper pressure rating documentation and connection reliability. Manufacturing follows ISO 9001 quality management protocols with material certifications meeting DIN EN 10204 Type 3.1 documentation standards. Thread connections conform to ISO 228-1 for parallel threads and ISO 7-1 for tapered threads, ensuring universal compatibility with international pneumatic components. For cleanroom applications, couplings meet particulate cleanliness requirements supporting ISO 14644-1 air cleanliness classifications. REACH compliance ensures material safety for European markets, while RoHS compliance restricts hazardous substances in electronic manufacturing environments where these couplings are frequently deployed.

What are the differences between Purge Hi-Cupla coupling variants and standard quick disconnect models?

Purge Hi-Cupla variants incorporate an integrated purge valve system that distinguishes them from standard Nitto Kohki Hi-Cupla models by automatically expelling residual air and contaminants upon disconnection. Standard quick couplings retain pressurized air in both halves after separation, while Purge versions feature spring-loaded purge mechanisms that evacuate the coupling chambers completely. Material options include standard brass bodies with NBR seals for general air service, stainless steel bodies with fluorocarbon seals for chemical compatibility, and specialized low-particle-generation versions with electropolished surfaces for cleanroom applications. Connection configurations range from male-female threaded combinations to panel-mount receptacles, with some variants offering different purge volume capacities depending on the application's contamination sensitivity requirements.

What installation requirements and system compatibility considerations apply to Purge Hi-Cupla pneumatic couplings?

Purge Hi-Cupla installation requires system pressure regulation within the 0-10 bar operating range with filtration to ISO 8573-1 Class 2 or better to prevent internal contamination of the purge mechanism. Thread connections must be sealed with PTFE tape or liquid thread sealant compatible with compressed air service, avoiding hemp or other organic sealants that generate particles. The purge function requires adequate exhaust ventilation in enclosed spaces since disconnection releases pressurized air and any accumulated contaminants. Panel-mount versions need mounting hole diameters matching the specific coupling size, typically requiring 16mm to 30mm panel cutouts depending on the model. System compatibility extends to all compressed air media with proper seal material selection, while specialized versions accommodate inert gases including nitrogen and argon for specialized manufacturing processes.

What safety ratings, IP protection class, and operating limits apply to Nitto Kohki Purge Hi-Cupla couplings?

Nitto Kohki Purge Hi-Cupla couplings operate safely within pressure limits of 0 to 10 bar working pressure with proof pressure testing to 15 bar and burst pressure ratings exceeding 40 bar for standard brass construction. Temperature operating range spans -20°C to +150°C for NBR sealed versions, extending to +200°C for specialized high-temperature variants with fluorocarbon seals. Standard models achieve IP54 protection against dust ingress and water splash, while specialized cleanroom versions meet IP65 ratings for washdown environments. The automatic purge function provides inherent safety by preventing accidental pressurization during coupling manipulation, reducing operator exposure to sudden air release. Material safety includes lead-free brass construction meeting RoHS compliance and food-grade seal options certified for direct food contact applications under FDA CFR 21.177 regulations.

What maintenance schedule, service life expectations, and inspection requirements apply to Purge Hi-Cupla pneumatic quick couplings?

Purge Hi-Cupla couplings require quarterly inspection of the purge valve function by testing complete air evacuation during disconnection cycles, ensuring no residual pressure remains in either coupling half. Seal replacement intervals depend on operating conditions but typically range from 50,000 to 100,000 connection cycles for NBR seals in clean compressed air service, extending to 200,000 cycles for fluorocarbon seals in chemical environments. Monthly visual inspection should verify coupling body integrity, thread condition, and absence of particle accumulation around the purge exhaust ports. Service life averages 5-7 years in standard industrial pneumatic applications with proper filtration to ISO 8573-1 Class 2 standards. Critical applications requiring validated cleanliness may necessitate annual seal replacement regardless of cycle count, with complete coupling replacement recommended after 10 years or 500,000 connection cycles to maintain purge function reliability and prevent cross-contamination risks.