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NAI LOK QC Series Double End Shut-off Quick Connector Coupling Body and Stem Valve
The NAI LOK QC Series Double Shut-off Quick Connector represents the pinnacle of safe, efficient, and reliable fluid handling solutions. Engineered for demanding industrial applications, this quick connector features an advanced double shut-off mechanism that automatically seals both the plug and socket sides upon disconnection. This critical design eliminates fluid spillage, protects operators from hazardous media, prevents system pressure loss, and safeguards the environment. Ideal for a wide range of industries, including chemical processing, petroleum, lubricant transfer, hydraulic systems, and industrial automation, the QC Series ensures maximum uptime and operational integrity.Key Features & Benefits:
Double Shut-off Safety Mechanism: The core feature of this connector. Upon uncoupling, internal valves in both the plug (male) and socket (female) double ferrule, bulkhead Tube Fitting halves close instantly and automatically. This contains fluid within both lines, preventing dangerous leaks, minimizing waste, and protecting personnel from exposure to potentially harmful chemicals or high-pressure fluids.
Zero Leakage Design: Precision machining and high-quality sealing elements ensure a bubble-tight seal in both the connected and disconnected states. This maintains system pressure, reduces product loss, and contributes to a cleaner, safer workplace.
Pressure-Rated Robust Construction: Manufactured from high-grade materials such as stainless steel SUS316 and 6Mo 6 Moly S31254, 904L (chloride-resistant), Alloy 625 (Inconel®), Hastelloy®, Monel®, or super duplex steel (UNS S31803/S32750/S32760), with seals available in NBR, and other compounds. This ensures excellent corrosion resistance, durability, and compatibility with a vast array of media, including oils, fuels, chemicals, water, and air.
Easy and Secure Connection/Disconnection: Designed for one-handed operation in many sizes. The sleek sleeve design allows for easy engagement and disengagement, even under residual pressure, significantly improving workflow efficiency and reducing operator fatigue.
Visual and Audible Connection Confirmation: A distinct "click" sound and a visual check (often through a colored indicator ring or sleeve position) provide positive confirmation that a secure, locked connection has been achieved. This prevents accidental disconnections that could lead to costly downtime or safety incidents.
Variety of Types and Sizes: Available in multiple types (e.g., Straight, Elbow, Panel Mount) and a comprehensive range of sizes (e.g., 1/4", 3/8", 1/2", 3/4") to fit various hose and tube diameters, providing flexibility for any system design.
| Material | Stainless Steel 316, 904L (chloride-resistant), Alloy 625 (Inconel®), Hastelloy®, Monel®, or super duplex steel (UNS S31803/S32750/S32760), 6 Mo Moly |
| Max working pressure | 3000psi |
| Working temperature | Normal degree |
| Stem | Stainless Steel 316 |
| Poppet | Stainless Steel 316 |
| O-ring | PTFE |
| End Connection | NAI-LOK Tube Fitting, female, male |
| Stainless Steel 316 | Excellent general corrosion resistance, good mechanical strength, and weldability. SS316L (low carbon) offers superior resistance to sensitization (carbide precipitation) in welded applications. |
6 Moly (6% Molybdenum Super Austenitic, UNS S31254, N08367) |
Enhanced pitting/crevice corrosion resistance (PREN >40), high chloride tolerance, and acid resistance surpassing standard stainless steels. |
| Duplex Steel (UNS S31803 / S32205) | Excellent chloride and stress corrosion cracking resistance. |
| Super Duplex Steel (UNS S32750 / S32760) | Enhanced strength and pitting resistance for harsh offshore/chemical environments. |
| Inconel ® 625 (UNS N06625) | Resists oxidation and acidic corrosion. |
| Hastelloy ® C276 (UNS N10276) | Ideal for sulfuric, hydrochloric, and other aggressive acids. |
| Monel ® 400 (UNS N04400) | Superior performance in seawater and hydraulic flow acid. |
| QC | N | 4 | S | |||
| Basic Series |
End Connection | Size | Material | |||
| QC | N-NAl-LOK F-Female NPT M-Male NPT |
4-1/4 in. 6-3/8in. 8-1/2 in. |
S-316 Stainless steel | |||
Industries & Applications:
Chemical & Petrochemical: Safe transfer of solvents, additives, and process fluids.
Manufacturing & Machinery: Lubrication systems, hydraulic tool connections, coolant lines.
Oil & Gas: Fuel and lube transfer, off-shore and on-shore equipment.
Transportation: Vehicle maintenance, fluid filling and draining, brake test lines.
Industrial Automation: Connecting pneumatic and fluid circuits on robotic arms and machinery.
Food and Beverage: (With appropriate material certifications) Transfer of food-grade oils and liquids.
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