LYHY Quick-Connect Pipe Fittings

Product Overview

LYHY quick-connect pipe fittings are core pipeline connectors in pneumatic systems, specifically designed for rapidly connecting PU/PE/PA pneumatic hoses to valve bodies, cylinders, and air supply lines. They utilize a mechanical snap-lock mechanism to enable tool-free, quick hose connection and disconnection, ensuring convenient and efficient operation. The fittings feature a nickel-plated brass body as the main material, equipped internally with stainless steel retaining rings and NBR nitrile rubber sealing rings. For certain special applications requiring high temperature and oil resistance, an FKM fluororubber sealing version is available. With a dual-seal structure, these fittings effectively ensure the airtightness and stability of the air circuit. The rated working pressure is 0–1.0 MPa, and all finished products undergo 100% leak-proof pressure testing; the burst pressure is ≥4 times the working pressure. Standard insertion/extraction life exceeds 5,000 cycles, and the operating temperature range is –20°C to 80°C. These fittings can meet the usage requirements of most pneumatic circuits and are widely used in automated equipment, textile machinery, packaging equipment, construction machinery, and other fields.

Core Structure and Technical Principles

The core structure of the quick-connect pipe fitting consists of three parts: a nickel-plated brass body, a stainless steel retaining ring, and an O-ring seal. When a pneumatic hose is inserted into the fitting, the stainless steel retaining ring automatically clamps the outer wall of the hose, achieving rapid locking. Simultaneously, the internal O-ring tightly seals against both the hose and the inner wall of the fitting, forming a dual-seal structure that effectively prevents air leakage. To remove the hose, simply press the unlocking mechanism at the end of the fitting, allowing easy extraction without any tools—making the operation simple and fast. This structural design ensures secure connections while enhancing ease of assembly and disassembly. Moreover, the dual-seal structure significantly reduces the risk of air leaks or hose disconnection caused by equipment vibration, making it well-suited for the long-term continuous operation demands of automated equipment.

Performance Parameters

1. Rated working pressure: 0–1.0 MPa
2. Burst pressure: ≥4 times the working pressure
3. Standard insertion/extraction life: ≥5,000 cycles
4. Operating temperature range: –20°C to 80°C (FKM fluororubber sealed versions can withstand –20°C to +120°C)
5. Compatible hoses: PU, PE, PA pneumatic hoses
6. Body material: nickel-plated brass
7. Seal materials: NBR nitrile rubber, FKM fluororubber
8. Thread specifications: G/R/NPT/M and various other international mainstream standards
9. Product types: straight, elbow, tee, reducer, partition, and more

Key Advantages

1. Dual-seal leak-proof design: Combining a stainless steel retaining ring lock with an O-ring seal, this dual-seal structure minimizes the risk of air leaks or hose disconnection even under vibrating conditions, greatly improving air circuit stability.
2. Rigorous factory leak-proof testing: Each fitting undergoes 100% leak-proof pressure testing, strictly controlling potential leaks at the source and ensuring consistent product quality.
3. High safety margin and long service life: With a burst pressure ≥4 times the working pressure and a standard insertion/extraction life exceeding 5,000 cycles, maintenance frequency is reduced, lowering overall maintenance costs.
4. Corrosion-resistant and durable materials: The nickel-plated brass body offers excellent oxidation and rust resistance, paired with optional NBR/FKM sealing materials to adapt to different temperature and oil mist conditions.
5. Tool-free, efficient installation: Designed for immediate locking upon insertion and easy removal by pressing, eliminating the need for tools. Installation time per joint has been shortened from the traditional 60–90 seconds to just 8–15 seconds, boosting overall pipeline assembly efficiency by over 70%, saving labor hours and reducing equipment delivery time.
6. Comprehensive specifications and wide compatibility: Available in straight, elbow, tee, reducer, and partition types, supporting multiple international thread standards such as G/NPT/M, meeting the needs of most pneumatic circuits in automated equipment, packaging machinery, textile devices, and more. It also adapts to equipment from Europe, Southeast Asia, and other regions, minimizing selection mismatches.
7. Vibration-resistant adaptation for continuous operation: The robust locking structure accommodates the vibrations inherent in long-term continuous operation of automated equipment, ensuring stable air circuit performance and reducing downtime risks.
8. Convenient debugging and maintenance: The push-to-release design makes hose disconnection during production line debugging or equipment maintenance much easier, effectively reducing losses due to downtime.

Core Value of the Product

1. Enhances assembly efficiency and reduces labor costs: The tool-free quick-connect design significantly shortens pipeline assembly time and lowers labor input, helping manufacturers shorten equipment delivery cycles and improve production efficiency.
2. Reduces energy consumption and maintenance costs: Excellent sealing performance minimizes system air leaks, cutting down on air supply energy use, while the long insertion/extraction life decreases spare part replacement frequency, reducing maintenance workload and overall operating costs.
3. Improves equipment operational stability: The dual-seal and vibration-resistant anti-disconnection design ensures stable air circuit performance even under continuous operation and vibration conditions, reducing equipment downtime caused by air circuit failures.
4. Adaptable to diverse scenarios and international markets: With multiple specifications and materials available, suitable for various environmental conditions and compatible with mainstream international thread standards, facilitating equipment exports and overseas market expansion.
5. Ensures compliance and quality: Through 100% leak-proof testing and strict material control, we provide material and test documentation to meet regulatory requirements for food-grade, new energy, and other projects.

Target Customer Groups

Non-standard automation equipment manufacturers, packaging machinery producers, textile machinery makers, printing equipment companies, woodworking machinery manufacturers, food processing equipment enterprises, lithium battery/photovoltaic equipment vendors, construction machinery suppliers, pneumatic hardware distributors, production line renovation and old equipment upgrade service providers, pneumatic circuit renovation project contractors, and overseas buyers of pneumatic components.

Application Scenarios

LYHY quick-connect pipe fittings are widely used in non-standard automation equipment, packaging machinery, textile and woodworking devices, new energy tooling, assembly lines, and equipment renovation and maintenance projects. Specifically, they can connect and disconnect hoses quickly with various pneumatic components such as cylinders, solenoid valves, pneumatic grippers, and blow-off dust removal circuits, particularly suited for equipment operating continuously under vibration conditions. In projects like food processing and new energy, where material and quality requirements are stringent, corresponding material and test documentation can be provided to meet compliance needs. Additionally, in outdoor equipment or workshops with heavy oil contamination, selecting appropriate sealing and body materials can still ensure stable air circuit performance.

Solutions to Industry Pain Points

1. Addressing low assembly efficiency and high labor costs associated with traditional pipe fittings: The tool-free quick-connect design dramatically reduces single-point installation time, boosts overall assembly efficiency, and saves labor hours.
2. Improving common issues of frequent air leaks and poor air circuit stability: The dual-seal structure combined with the stainless steel retaining ring lock effectively reduces system air leaks and cuts down on air supply energy consumption. Meanwhile, the vibration-resistant anti-disconnection design adapts to continuous operation conditions, ensuring stable air circuit performance.
3. Solving the problem of frequent spare part replacements and high maintenance costs: With a long insertion/extraction life of ≥5,000 cycles, the frequency of replacing fittings is reduced, lowering maintenance workload and overall operating costs.
4. Avoiding mismatched thread specifications and poor compatibility: Supporting multiple international mainstream thread standards such as G/NPT/M, adapting to equipment from Europe, Southeast Asia, and other regions, thus minimizing selection errors.
5. Meeting diverse material adaptation needs across different operating conditions: Offering options such as nickel-plated brass and stainless steel bodies, along with NBR and FKM sealing materials, to accommodate complex conditions including humidity, salt spray corrosion, high temperatures, and oil mist.

Frequently Asked Questions (FAQ)

Q1: Can LYHY quick-connect pipe fittings be used in hydraulic circuits?
A: No, this product is designed exclusively for pneumatic systems and is not suitable for hydraulic circuits or highly corrosive media.
Q2: What’s the difference between the FKM fluororubber sealed version and the NBR nitrile rubber version?
A: The NBR nitrile rubber sealed version operates within a temperature range of –20°C to +60°C, suitable for normal operating conditions. The FKM fluororubber sealed version covers a wider range of –20°C to +120°C, offering superior heat and oil resistance, ideal for special high-temperature and oil-resistant applications.
Q3: Does the product come with material and test documentation?
A: Yes, we provide material and test documentation to meet compliance requirements for food-grade, new energy, and other projects.
Q4: How long is the insertion/extraction life of LYHY quick-connect pipe fittings?
A: The standard insertion/extraction life exceeds 5,000 cycles, sufficient for long-term use and reducing the need for future replacements.
Q5: Which thread specifications does the product support?
A: The product supports multiple international mainstream thread standards such as G/R/NPT/M, adaptable to most pneumatic circuits and equipment from various countries.