Dongfeng GX Return Water Rubber Hose 1311048-H0100

As a critical component in the engine cooling circuit, this return water hose is engineered to withstand extreme thermal and hydraulic stress. The inner rubber layer is formulated from EPDM (ethylene propylene diene monomer) rubber, a heat-resistant material that maintains flexibility and structural integrity across a temperature range of -40°C to +135°C—ideal for Dongfeng GX trucks operating in high-load conditions (e.g., uphill hauling) where coolant temperatures can reach 105°C. It is rated to handle a maximum working pressure of 1.2 MPa (174 psi) and a burst pressure of 3.6 MPa (522 psi), exceeding the typical operating pressure of diesel engine cooling systems (0.8-1.0 MPa). This pressure resistance prevents hose rupture even during sudden pressure spikes caused by thermostat closure or coolant system blockages

The hose features a multi-layer reinforced construction optimized for durability and unobstructed coolant flow. Between the EPDM inner layer and outer protective cover lies a high-tensile polyester braid reinforcement (16 plies), which enhances tensile strength (≥1200 N/cm) and resists expansion under pressure—maintaining a consistent inner diameter to ensure maximum coolant flow rate (≥80 L/min at 1.0 MPa). The smooth inner surface (roughness Ra ≤0.8μm) minimizes flow resistance and prevents sediment buildup, reducing the risk of cooling system clogging. The outer layer, also made of EPDM, is UV-stabilized and ozone-resistant, protecting the reinforcement layer from environmental damage and extending service life

This return water hose is formulated to resist degradation from automotive coolants, including ethylene glycol-based fluids, corrosion inhibitors, and antifreeze additives commonly used in Dongfeng GX engines. The EPDM rubber exhibits excellent chemical compatibility, with no measurable swelling (<5% volume change) after 1,000 hours of immersion in standard coolants. The hose ends are reinforced with integral rubber beads (shore hardness: 70±5 A) that create a tight seal with the radiator and water pump ports, eliminating the need for additional gaskets. Each unit undergoes a 24-hour pressure test at 1.5 MPa to ensure leak-free performance, with a maximum allowable leakage rate of 0.1 ml/min—far below industry standards

The Dongfeng GX Return Water Rubber Hose meets stringent domestic and international standards for automotive cooling system components. It complies with GB/T 18948 (China National Standard for Automotive Coolant Hoses), SAE J20R4 (Society of Automotive Engineers Standard for Radiator and Heater Hoses), and Dongfeng’s internal Q/DF 022-2024 specification for engine cooling hoses. Each hose undergoes rigorous factory testing, including: a heat aging test (168 hours at 150°C), a cold flexibility test (-40°C for 72 hours without cracking), a burst pressure test, and a dimensional accuracy inspection. These certifications ensure reliable performance in diverse operating environments, making it suitable for Dongfeng GX trucks operating in extreme climates—from cold northern regions to hot desert areas