LYHY Quick-Connect Pipe Fittings

Product Overview

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 insertion and removal of hoses, ensuring convenient and efficient operation. The product features a nickel-plated brass body as its 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, it effectively ensures the airtightness and stability of the air circuit. The product has a rated working pressure of 0–1.0 MPa, and all finished products undergo 100% leak-proof pressure testing; the burst pressure is ≥4 times the working pressure. The standard insertion/removal life exceeds 5,000 cycles, and the operating temperature range is –20°C to 80°C. It can meet the usage requirements of most pneumatic circuits and is widely used in pneumatic systems across various fields, including automation equipment, textile machinery, packaging equipment, and construction machinery.

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 of the pipeline. Simultaneously, the internal O-ring tightly fits 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 not only ensures secure connections but also enhances ease of 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/Removal 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 other major international 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 with an O-ring seal, this design minimizes the risk of air leaks or hose disconnection even under vibrating conditions, greatly enhancing 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/removal life exceeding 5,000 cycles, it reduces the frequency of replacements and lowers maintenance costs.
4. Corrosion-Resistant and Durable Materials: The nickel-plated brass body offers excellent oxidation and rust resistance, while optional NBR/FKM seals accommodate different temperature and oil mist conditions.
5. Tool-Free, Efficient Installation: Designed for immediate locking upon insertion and effortless removal by pressing, installation time per connection is reduced from the traditional 60–90 seconds to just 8–15 seconds, boosting overall pipeline assembly efficiency by over 70% and saving labor hours while shortening equipment delivery cycles.
6. Comprehensive Specifications and Wide Compatibility: Available in straight, elbow, tee, reducer, partition, and other types, supporting multiple international thread standards such as G/NPT/M, meeting the needs of most pneumatic circuits in automation equipment, packaging machinery, textile devices, and more, while also adapting to equipment from Europe, Southeast Asia, and beyond, reducing selection mismatches.
7. Vibration-Resistant Adaptation for Continuous Operation: Its robust locking structure accommodates the vibrations inherent in long-term continuous operation of automated equipment, ensuring stable air circuit performance and minimizing downtime risks.
8. Convenient Debugging and Maintenance: The push-to-release design makes pipeline disassembly 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 cuts down on labor input, helping manufacturers shorten equipment delivery cycles and boost production efficiency.
2. Lowers Energy Consumption and Maintenance Costs: Excellent sealing performance reduces system air leaks, lowering energy consumption, while the long service life decreases the frequency of spare part replacements, cutting down on maintenance workload and overall operating costs.
3. Improves Equipment Operational Stability: The dual-seal and vibration-resistant design ensures stable air circuit performance even under continuous operation and vibration, minimizing equipment downtime caused by air circuit failures.
4. Adaptable to Multiple Scenarios and International Markets: With multiple specifications and materials available, it suits diverse environmental conditions and complies 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, it provides material and test documentation to meet compliance requirements for food processing, new energy projects, and more.

Target Customer Groups

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

Application Scenarios

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—covering various pneumatic systems. Specifically, they can connect hoses to cylinders, solenoid valves, pneumatic grippers, blow-off dust removal circuits, and other pneumatic components, enabling rapid hose connection and disassembly, particularly suitable for equipment operating continuously under vibration. In food processing, new energy, and other projects with stringent material and quality requirements, corresponding material and test documentation can be provided to meet compliance needs. Additionally, for outdoor equipment or workshops with heavy oil contamination, selecting appropriate seal and body materials can ensure stable air circuit performance.

Solutions to Industry Pain Points

1. Addressing the low assembly efficiency and high labor costs of 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 like frequent air leaks and poor air circuit stability: The dual-seal and stainless steel retaining ring design effectively reduces system air leaks and lowers energy consumption, while the vibration-resistant design adapts to continuous operation, ensuring stable air circuit performance.
3. Solving the problem of frequent spare part replacements and high maintenance costs: With a long service life of ≥5,000 cycles, it reduces the need for later fitting replacements, cutting down on maintenance workload and overall operating costs.
4. Avoiding mismatched thread specifications and poor compatibility: Supporting multiple international thread standards such as G/NPT/M, it adapts to equipment from Europe, Southeast Asia, and beyond, reducing selection errors.
5. Meeting diverse material adaptation needs: Offering options like nickel-plated brass, stainless steel, and two types of seals—NBR and FKM—this product can handle complex conditions such as humidity, salt spray corrosion, high temperatures, and oil mist.

Common Questions FAQ

Q1: Can 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 version operates within a temperature range of –20°C to +60°C, suitable for regular conditions; the FKM fluororubber 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, the product provides material and test documentation to meet compliance requirements for food processing, new energy projects, and more.
Q4: How long is the insertion/removal life of these fittings?
A: The standard insertion/removal life exceeds 5,000 cycles, sufficient for long-term use and reducing the need for later replacements.
Q5: Which thread specifications does the product support?
A: The product supports multiple international thread standards such as G/R/NPT/M, compatible with most pneumatic circuits and equipment from various countries.