Medium Pressure up to 75 Bar

Zero Spill Cupla

The Nitto Kohki Zero Spill Cupla covers quick-release couplings that prevent any fluid release during disconnection and are rated for medium pressures up to 75 bar. The extensive range divides into single couplings of the ZEL series (brass, FKM/NBR) and Multi Cupla Zerospill (MAM-A/MAM-B) in brass or aluminium. MAM-A and MAM-B allow simultaneous connection of two to four lines, with sizes 2S to 4P, direct hose connections (6-12 mm), and FKM or NBR seals available.

The ZEL single couplings are available in brass with FKM seals for nominal sizes 2P to 4P and 2S to 4S. The spill-free function prevents fluid loss during coupling and uncoupling, which is especially relevant for environmentally sensitive media or costly fluids.

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Buying guide

How to choose Zero Spill Cupla

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

Technical features

✓ Zero spill function - No fluid release during disconnection, prevents contamination and media loss

⚡ Up to 75 bar operating pressure - Brass and aluminium for medium pressure hydraulics and pneumatics

⬡ FKM and NBR seals - Resistant to oils, synthetic hydraulic fluids, and weak acids

⚙ Multi Cupla MAM-A/MAM-B - Simultaneous coupling of 2-4 lines, hose connection 4-12 mm

↕ Extensive range - ZEL single couplings and MAM multi-couplings for flexible system design

Series comparison

Series	Connections	Material	Seal	Connection type
ZEL-2P/S to 4P/S	Single coupling	Brass	FKM	G thread
MAM-A-ZEL-2S to 4P	Single zero spill	Brass	FKM	G thread
MAM-A-2S6-CL to 4S12-CL	2-4 lines	Aluminium	NBR	Hose 6/8/12 mm
MAM-A-2P6-CL to 4P8-CL	2-4 lines	Aluminium	-	Hose 6/8 mm
MAM-B-2S6-CL / 2P6-CL	2 lines	Aluminium	-	Hose 6/8 mm

Typical applications

Typical applications: Hydraulic systems with environmentally sensitive or costly media, line connections in the chemical and pharmaceutical industries, coolant connections in machine tools, multi-coupling applications on construction equipment attachments, and quick-change systems on test rigs where fluid loss during coupling must be excluded.

FAQ

Frequently asked questions about Zero Spill Cupla

What are Nitto Kohki Zero Spill Cupla quick couplings and their primary industrial applications?

Nitto Kohki Zero Spill Cupla quick couplings are leak-proof pneumatic and hydraulic connection systems designed for medium pressure applications up to 75 bar. These couplings feature zero spillage technology that prevents fluid loss during connection and disconnection operations, making them essential for precision manufacturing, automated assembly lines, food processing equipment, and clean room environments. The couplings are available in aluminum and stainless steel construction with NBR, EPDM, or FKM sealing materials to accommodate various media compatibility requirements. Industries utilizing these systems include automotive manufacturing, pharmaceutical production, semiconductor fabrication, and hydraulic test equipment where contamination control and fluid conservation are critical operational requirements.

What technical selection criteria determine the proper Nitto Kohki Zero Spill Cupla specification?

Technical selection of Nitto Kohki Zero Spill Cupla couplings requires evaluation of operating pressure up to 75 bar maximum, port connection sizes ranging from 2S to 8S configurations, and body material compatibility with aluminum or stainless steel options. Seal material selection between NBR, EPDM, and FKM depends on operating temperature range and chemical compatibility with system fluids including compressed air, hydraulic oils, and water-based media. Connection thread specifications such as 4S8, 3S12, and 2S6 configurations must match existing system fittings, while the Multi Cupla variants like MAM-A and MAM-B series offer different flow characteristics and mounting orientations. Media cleanliness requirements and environmental conditions determine whether aluminum or stainless steel construction provides optimal corrosion resistance and service life.

Which international standards and certifications apply to Nitto Kohki Zero Spill Cupla systems?

Nitto Kohki Zero Spill Cupla quick couplings comply with ISO 4414 pneumatic system safety standards and ISO 7241 hydraulic quick coupling specifications for leak-proof performance and pressure ratings up to 75 bar. The couplings meet DIN 3489 and EN 561 requirements for quick-acting couplings in industrial fluid power applications, ensuring compatibility with European machinery directive standards. Material specifications follow ISO 1127 for stainless steel components and ISO 1629 for elastomeric seal compounds including NBR, EPDM, and FKM materials. Manufacturing quality systems adhere to ISO 9001 certification requirements, while chemical compatibility testing follows ISO 23936 standards for hydraulic fluid resistance and long-term seal integrity under cyclic pressure loading conditions.

What are the key differences between Zero Spill Cupla and Multi Cupla Zerospill variants?

Zero Spill Cupla models like ZEL-8S feature single-connection designs in brass or stainless steel with individual seal options of NBR, EPDM, or FKM materials for specific media compatibility. Multi Cupla Zerospill variants such as MAM-A and MAM-B series provide multiple simultaneous connections through aluminum manifold blocks, enabling parallel fluid distribution with consistent zero-spillage performance across all ports. The MAM-A series incorporates NBR sealing throughout the manifold assembly, while MAM-B variants utilize alternative sealing configurations for specialized applications. Multi Cupla systems accommodate port configurations from 2S6 to 4S8 threading with integrated flow balancing, whereas standard Zero Spill Cupla units focus on single high-flow applications requiring maximum leak integrity at pressures approaching 75 bar operating limits.

What installation requirements and system compatibility factors apply to Zero Spill Cupla connections?

Installation of Nitto Kohki Zero Spill Cupla systems requires thread engagement torque specifications according to port size, with 2S configurations requiring 15-20 Nm and larger 8S ports needing 35-45 Nm installation torque to ensure proper seal compression. System compatibility depends on maintaining clean installation environments with filtered compressed air or hydraulic fluid to prevent contamination of the zero-spillage sealing mechanism during initial connection cycles. Thread compatibility covers metric and imperial sizing with proper thread compound application on male connections, while female coupling bodies require straight thread engagement without cross-threading that could damage the internal sealing surfaces. Multi Cupla manifold installations need adequate clearance spacing for simultaneous coupling engagement and proper support mounting to prevent mechanical stress on individual connection points during high-pressure operation up to 75 bar system pressure.

What safety ratings and operating parameters define Zero Spill Cupla performance limits?

Nitto Kohki Zero Spill Cupla couplings operate safely at maximum working pressures of 75 bar with temperature ranges from -20°C to +80°C for NBR seals, -40°C to +150°C for EPDM variants, and -20°C to +200°C for FKM high-temperature applications. Safety factors incorporate 4:1 burst pressure ratios above maximum working pressure, ensuring structural integrity under hydraulic shock loading and pressure spikes common in industrial pneumatic systems. Stainless steel variants provide enhanced corrosion resistance for food-grade and pharmaceutical applications requiring frequent washdown cycles, while aluminum bodies offer weight reduction for mobile equipment installations. Connection safety features include positive engagement indicators and controlled disconnection sequencing that prevents accidental separation under pressure, maintaining zero spillage integrity throughout the complete coupling lifecycle even during emergency system shutdown procedures.

What maintenance schedule and service life expectations apply to Zero Spill Cupla systems?

Zero Spill Cupla maintenance schedules require quarterly visual inspection of coupling engagement mechanisms and semi-annual replacement of sealing elements in high-cycle applications exceeding 10,000 connection cycles per year. Service life expectations range from 50,000 to 100,000 connection cycles depending on operating pressure, with systems operating continuously at 75 bar requiring seal replacement every 18-24 months to maintain zero-spillage performance. Preventive maintenance includes monthly cleaning of coupling surfaces with compatible solvents, lubrication of engagement threads according to manufacturer specifications, and pressure testing at 1.5 times working pressure to verify seal integrity. Inspection requirements focus on detecting seal wear indicators, checking for thread damage or corrosion on aluminum bodies, and verifying proper engagement force characteristics that ensure reliable zero-spillage operation throughout the coupling service interval.