High-Pressure up to 700 Bar

Purge Adapter

The Nitto Kohki Purge Adapter PAD-2 is an accessory for high-pressure lines up to 700 bar that allows the residual pressure in a pressurised line to be safely vented before the main coupling (e.g. HSU Cupla or other high-pressure series) is disconnected. The PAD-2 is steel with an NBR seal. This pressure-relief step is a safety requirement in high-pressure applications, since couplings disconnected under residual pressure can release fluid or gas in an uncontrolled manner.

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Purge adapter Purge Adapter PAD-2, steel - Nitto Kohki 599865148
€152.52

Buying guide

How to choose Purge Adapter

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

Technical features

⚙ Steel body, NBR seal - designed for high-pressure service up to 700 bar

✓ Function: residual pressure relief - controlled venting of line pressure before disconnection

⚡ Compatibility - designed for use with Nitto Kohki high-pressure coupling series

↕ Safety function - prevents uncontrolled release of pressure or media during coupling disconnection

Product data

Part number	Body material	Seal	Function
PAD-2	Steel	NBR	Residual pressure relief, high pressure up to 700 bar

Typical applications

Typical applications: Preparing pressure-free disconnection of Nitto Kohki high-pressure couplings (HSU, 700R, 450B and related series) on hydraulic test rigs, machine tools with high-pressure coolant systems, waterjet cutting installations, and all high-pressure systems where residual pressure relief before coupling changeover is a safety or process requirement.

FAQ

Frequently asked questions about Purge Adapter

What are purge adapters and what industrial applications use these high-pressure pneumatic components?

Purge adapters are specialized pneumatic quick-connect fittings designed to safely evacuate pressurized systems and introduce cleaning or inert gases into high-pressure pneumatic and hydraulic circuits operating up to 700 bar. The Nitto Kohki PAD-2 purge adapter with steel construction and NBR sealing enables controlled system depressurization in manufacturing automation, hydraulic power units, and compressed air systems. These adapters are essential in chemical processing, automotive testing equipment, and industrial machinery where system contamination must be eliminated and safe pressure relief is mandatory for maintenance operations.

What technical specifications should engineers consider when selecting purge adapters for 700 bar applications?

Critical selection criteria for high-pressure purge adapters include maximum working pressure rating up to 700 bar, seal material compatibility with system media, and quick-coupling body construction materials. The Nitto Kohki PAD-2 features steel construction for maximum pressure resistance and NBR sealing rings that provide excellent compatibility with compressed air, nitrogen, and most hydraulic fluids. Connection thread specifications, flow coefficient values, and temperature range from -20°C to +80°C determine system integration compatibility and operational performance in demanding industrial environments.

Which ISO standards and safety certifications apply to industrial purge adapters for pneumatic systems?

High-pressure purge adapters must comply with ISO 4414 for pneumatic fluid power safety requirements and ISO 5675 for quick-action coupling specifications to ensure reliable connection and disconnection under pressure. Steel construction purge adapters like the Nitto Kohki PAD-2 typically meet DIN 3489 dimensional standards for pneumatic quick couplings and require pressure equipment compliance according to the Pressure Equipment Directive 2014/68/EU for systems exceeding 0.5 bar. Material certifications for NBR sealing elements must demonstrate chemical resistance according to ISO 1629 elastomer classification standards.

How do different purge adapter variants compare in terms of pressure ratings and connection types?

The Nitto Kohki PAD-2 purge adapter represents the steel-bodied variant designed for maximum pressure applications up to 700 bar with NBR sealing for standard compressed air and nitrogen service. Steel construction variants offer superior pressure resistance and longer service life compared to brass or aluminum alternatives, making them suitable for hydraulic system integration and high-cycle pneumatic applications. Different seal materials including PTFE, Viton, and EPDM variants accommodate specific media compatibility requirements, while thread configurations from G1/4 to G1/2 provide flexibility for various system connection requirements.

What installation requirements and system compatibility factors apply to high-pressure purge adapters?

Installation of 700 bar purge adapters requires proper thread engagement with torque values between 25-35 Nm for G1/4 connections and compatible thread sealant rated for system pressure and media. The Nitto Kohki PAD-2 quick-coupling design enables tool-free connection and disconnection while maintaining system pressure integrity through spring-loaded ball locking mechanisms. System compatibility demands consideration of flow rates up to 1200 l/min, pressure drop characteristics, and integration with existing pneumatic manifolds or valve blocks using standard BSP or NPT thread connections.

What are the safety ratings and operating parameter limits for industrial purge adapters?

High-pressure purge adapters operate safely within temperature ranges from -20°C to +80°C with maximum working pressures up to 700 bar and burst pressure ratings typically exceeding 2800 bar for steel construction units. The Nitto Kohki PAD-2 maintains IP54 protection rating against dust and water ingress when properly connected, ensuring reliable operation in industrial environments. Safety factors of 4:1 between working pressure and burst pressure provide adequate margins for dynamic loading, while NBR sealing materials demonstrate excellent resistance to ozone, weathering, and most pneumatic media at operating pressures.

What maintenance schedules and inspection requirements ensure reliable operation of high-pressure purge adapters?

Preventive maintenance for 700 bar purge adapters requires quarterly visual inspection of seal condition, connection threads, and coupling body for wear or damage, with complete seal replacement recommended every 12-18 months depending on cycle frequency and operating conditions. The Nitto Kohki PAD-2 steel construction enables service life exceeding 100,000 connection cycles when operated within specified pressure and temperature limits with proper system filtration. Annual pressure testing at 1.5 times working pressure verifies system integrity, while lubrication of moving parts with pneumatic-grade lubricants every 6 months ensures smooth coupling operation and extends component service life.