【Product Basic Overview】

The hydraulic oil return rubber hose is a core supporting special hose for the return circuit of engineering machinery hydraulic systems, specially developed for low-pressure return and negative pressure suction working conditions of hydraulic oil. It solves common problems of ordinary return hoses such as poor oil resistance, easy aging at high temperature, collapse under negative pressure, pipeline impurity blockage of hydraulic valves, delamination and oil leakage caused by equipment vibration, and brittleness/softening at high and low temperatures. Adopting multi-layer composite high-temperature vulcanization process with NBR oil-resistant inner rubber, high-strength industrial yarn knitted reinforcement and CSM/weather-resistant NBR outer rubber, the layers are tightly bonded without delamination, bulging or cracking with stable overall structure. Produced and controlled in strict accordance with JB/T7858 pipeline cleanliness standard, it has high internal cleanliness and effectively protects precision hydraulic components such as hydraulic pumps, valves and oil cylinders from impurity wear. Suitable for complex and harsh working conditions such as outdoor operation of engineering vehicles, high temperature in engine compartment, low temperature in winter and continuous equipment vibration, stable return oil conveying without leakage for a long time, and it is a basic wear-resistant accessory for the normal operation of engineering machinery hydraulic systems.

【Product Structure & Core Material Description】

1. Inner Oil-Resistant Rubber Layer: Made of high-quality NBR nitrile rubber, resistant to long-term corrosion of HLP46 and HLP68 hydraulic oil, no oil swelling, no oil leakage and no aging. The inner wall is smooth and dense with low fluid transmission resistance, no impurity accumulation and no hydraulic oil pollution, ensuring long-term clean and smooth hydraulic oil circuit. 2. Middle Reinforcement Skeleton Layer: Adopting high-density and high-strength industrial yarn knitted braided reinforcement structure, improving the overall tensile strength, flex fatigue resistance and structural stability of the hose. It can effectively withstand equipment operation vibration and slight pipeline torsion deformation, no collapse under negative pressure and no deformation under low pressure with uniform pressure resistance and not easy to damage. 3. Outer Protective Rubber Layer: Dual optional configuration of CSM chlorosulfonated polyethylene rubber or weather-resistant modified NBR rubber, dual weather-resistant and anti-aging formula, resistant to high and low temperature, ultraviolet rays, ozone and outdoor weathering wear. No cracking, hardening or pulverization after long-term use outside equipment, protecting the internal structure for long durability.

【Core Standard Technical Parameters】

Applicable Working Medium: Conventional engineering machinery mineral hydraulic oil such as HLP46 hydraulic oil and HLP68 hydraulic oil; Working Temperature Range: -40℃～120℃, stable adaptation to high and low temperature working conditions; Working Pressure Grade: Negative pressure resistance range -0.07MPa～0.1MPa, suitable for hydraulic return negative pressure suction working conditions; Burst Safety Pressure: The bursting pressure of new developed shaped finished hoses is not less than 0.6MPa, high safety factor and anti-burst; Pipeline Cleaning Standard: Refer to JB/T7858 hydraulic pipeline cleaning specification, maximum internal impurity diameter ≤500um, clean and valve protection anti-blocking; Conventional Specifications: Common engineering vehicle calibers such as DN15, DN20, DN25, DN32, DN40, DN50 are complete; Customization Service: Custom processing of non-standard caliber, arbitrary length, special-shaped bent pipes and matching joints as required.

【Core SEO Performance Advantages】

1. Oil and corrosion resistant no swelling: Special NBR oil-resistant inner rubber, no corrosion, swelling or penetration during long-term hydraulic oil conveying, avoiding oil leakage and hydraulic oil deterioration; 2. Negative pressure collapse resistance stable return oil: Reinforced structure ensures no collapse under negative pressure, smooth hydraulic oil return circulation without stalling and stable equipment operation; 3. Wide temperature weather aging resistance: No brittleness at -40℃ severe cold, no softening at 120℃ high temperature, outer rubber sun and weather resistant, long service life for outdoor long-term use; 4. Clean pipeline protecting hydraulic components: Produced in accordance with JB/T7858 cleaning standard, strict impurity control no valve blocking or pump wear, reducing hydraulic system failure and maintenance; 5. Flexible vibration resistant easy installation: Good hose flexibility and bending performance, suitable for wiring in narrow equipment cabins, anti-vibration no falling off or oil leakage; 6. Pressure resistant explosion-proof safe and reliable: Qualified bursting pressure of shaped products, safe and explosion-proof under low-pressure return working conditions, avoiding shutdown caused by pipe bursting; 7. Complete specifications and customizable: Conventional spot quick delivery, short non-standard customization cycle, adapting to full series of domestic and imported engineering machinery equipment.

【Main Application Scope】

Widely used in special return pipelines of hydraulic systems for various engineering machinery and equipment, including excavators, loaders, bulldozers, road rollers, graders, forklifts, cranes and other construction machinery; mainly used for hydraulic oil tank return connecting pipelines, hydraulic pump return pipelines, multi-way valve return pipelines, hydraulic system low-pressure return auxiliary pipelines and other working conditions, suitable for various complex operating environments such as construction site construction, mine operation, infrastructure engineering and farmland water conservancy projects, dedicated to low-pressure return and negative pressure suction conveying of engineering vehicle hydraulic oil.

【Original Manufacturer Supply Advantages】

We are a professional direct manufacturer of hydraulic oil return rubber hoses, factory direct sales without middlemen markup with favorable ex-factory price and high cost performance. Sufficient spot inventory for conventional common specifications with immediate delivery without delaying construction period. All hoses are produced in strict accordance with industrial process standards and JB/T7858 cleaning requirements. Each batch of products has passed oil resistance test, high and low temperature resistance test, negative pressure deformation test and burst pressure sampling inspection with strict quality control and stable reliability. We support bulk purchase orders for engineering parts dealers, maintenance factories and equipment manufacturers, undertake customized processing of non-standard special specifications, perfect after-sales service, long-term stable supply, one-stop meeting the procurement and supporting needs of engineering machinery hydraulic return pipelines.