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In the demanding working conditions of rotary drilling rigs, hydraulic breakers, high-frequency vibratory hammers, and mining machinery, hydraulic quick-connect couplings are far from insignificant parts—they are the "lifeline" ensuring the stable operation of the hydraulic system, and a key factor determining equipment uptime, operating costs, and operational safety.
Oil leaks, loosening, pulse impact damage, inoperability with residual pressure, frequent insertion and removal failures… these seemingly minor issues can lead to equipment downtime, oil waste, and environmental pollution, or even serious safety accidents and damage to core hydraulic components, resulting in incalculable economic losses. Ordinary ball bearing quick-connect couplings (ISO 7241-B) often succumb to the fate of "leaking with age, loosening with strong vibration, and failing under high pressure" under such harsh conditions; while the RK series threaded locking flat quick-connect couplings are designed to overcome these critical problems, becoming the standard choice for high-end hydraulic equipment.
Traditional ball bearing quick-connect couplings use a conical seal design, which inevitably leads to oil spraying and air intake upon disconnection. This not only wastes valuable hydraulic oil but also pollutes the working environment and shortens the lifespan of the hydraulic system. The RK series features a breakthrough flat seal structure with precise fit between the male and female connectors, coupled with double one-way flat valve cores, eliminating leakage risks at the source and achieving the ideal effect of "no air ingress during connection and no oil loss during disconnection."
Actual test data shows that after 1000 disconnections, the RK series coupling loses only about 0.02 liters of oil. The end-face seal design has built-in dust and dirt-proof properties, effectively preventing mud and impurities from entering the sealing cavity, significantly extending the replacement cycle of hydraulic oil and filters, keeping the hydraulic system clean, and significantly reducing the failure rate of core components such as pumps, valves, and cylinders. For engineering equipment that operates in the field for extended periods, has high environmental requirements, and suffers from high oil costs, the annual savings in oil and maintenance costs from the RK series often far exceed the initial investment in the coupling itself.
Ordinary quick-connect couplings rely on ball-operated clips for locking, which are prone to loosening, disengagement, and internal leakage under harsh conditions of high-frequency vibration and pulse impact, severely affecting normal equipment operation. The RK series adopts a threaded sleeve tightening locking structure. The female connector is equipped with a dedicated threaded sleeve, and the male connector has precision external threads. Tightening to the limit retaining ring achieves mechanical locking, completely solving the industry pain point of vibration-induced loosening.
As a high-pressure vibration-resistant coupling, the RK series has a rated working pressure of up to 42MPa (420bar) and a burst pressure of up to 1800bar, specifically designed for extreme working conditions of high-frequency pulses, strong vibration, and continuous impact. The valve body is precision forged from solid steel bars and carburized and quenched, possessing superior fatigue resistance, impact resistance, and bending resistance. Its unique threaded centering ring design ensures precise valve core alignment, preventing misalignment and jamming over long-term use. This results in stable performance with "ten thousand connections without loosening and no leakage under high-pressure pulses," making the RK series capable of handling continuous hammering by a hydraulic breaker, high-frequency vibrations of a drilling rig, or continuous day-and-night operation of mining equipment.
Most quick-connect fittings are strictly prohibited from operation under pressure. If residual pressure remains in the pipeline, forcibly pulling out the fitting can cause high-pressure oil spray that can injure people, damage seals, and pollute the environment. The RK series overcomes this limitation, supporting safe plug-and-play with ≤10MPa residual pressure on one side. This eliminates the need for machine shutdown for pressure relief, oil venting, or waiting for equipment to cool down. On-site emergency repairs and quick attachment replacements are completed in one step, significantly improving equipment uptime.
Under residual pressure conditions below 20 bar, the RK series can be manually screwed on and off. In high-pressure conditions, insertion and removal can be easily completed with specialized tools. The pressure-free design not only avoids air entering the hydraulic system and reduces the cumbersome process of system venting, but also fundamentally reduces safety risks during on-site operation, allowing operators to work with greater peace of mind and higher efficiency.
The RK series is not a wear part, but a high-pressure, vibration-resistant, long-life connector designed for long-term stable operation. Its core advantages are "durability, stability, and long lifespan," significantly reducing equipment maintenance costs.
The body is made of high-quality carbon steel or stainless steel, precision machined and polished, exhibiting excellent wear and corrosion resistance. Standard NBR and FKM high-performance seals are included, adapting to a wide temperature range of -25℃ to 120℃ to meet the needs of various operating conditions. The surface uses an environmentally friendly zinc-nickel electroplating process, providing outstanding rust and salt spray resistance, maintaining good performance even after long-term use in harsh outdoor environments. Meanwhile, the RK series is fully compatible with mainstream international standards such as Stucchi VR and Voswinkle RK, offering strong interchangeability and eliminating compatibility concerns.
Compared to ordinary quick-connect couplings that experience leakage and loosening within 3-6 months, the RK series maintains its performance for 2-5 years under normal use, resulting in lower overall operating costs and more stable and worry-free equipment operation.
The RK series hydraulic quick-connect couplings integrate five core advantages: threaded locking, flat sealing, high-pressure vibration resistance, zero leakage, and residual pressure insertion/removal capability. While not prioritizing the convenience of "one-second quick insertion," it focuses on reliability: "zero leakage after tens of thousands of connections, no loosening under strong vibration conditions, and no failure under high-pressure pulses." Specifically designed for extreme and harsh conditions, it is the ultimate choice for high-end hydraulic systems.
Compatible Equipment: Rotary drilling rigs, hydraulic breakers, vibratory hammers, mining machinery, metallurgical equipment, special vehicles, high-pressure hydraulic test benches, industrial stationary hydraulic systems, etc.
Incompatible operating conditions: Light-duty, low-pressure, requiring millisecond insertion/removal, and minimal vibration in simple hydraulic applications.
In hydraulic systems, inexpensive connectors save on immediate costs, while reliable connectors save on downtime losses, safety risks, and brand reputation. If you are troubled by problems such as oil leaks, loosening, vibration failure, and difficulty in insertion/removal under pressure with hydraulic quick-connect couplings, the RK series threaded locking flat quick-connect couplings, with their superior performance and stable operation, will undoubtedly become a reliable partner for your high-end hydraulic equipment.
Stable connection to high pressure, impervious to strong vibrations, and completely leak-free—this is the RK series, redefining the quality standards of high-end hydraulic quick-connect couplings.
