Possible faults and solutions for the adhesive layer inside high-pressure rubber hoses

1. The rubber layer inside the hose is hard and cracked: due to the addition of plasticizers in the rubber product, the hose is flexible and pliable. The hose works under high temperature and pressure, and overheating of the hose can cause the plasticizer to overflow. In addition, when overheated oil passes through cylinders, valves, or other components in the system, a significant pressure drop can cause the oil to decompose, leading to oxidation and hardening of the rubber layer inside the hose. In this situation, it is necessary to first check whether the working temperature of the hydraulic system is normal, whether the valve throttle and the pump suction passage are unobstructed, etc. After eliminating all possible factors that may cause high oil temperature and oil decomposition, replace the hose. If only the inner rubber below the hose rupture site becomes hard while the upper part remains good, it indicates that excessive compression, sharp bending, or twisting at the hose rupture site can cause the oil to heat up and accelerate oxidation, leading to the hardening of the inner rubber.

2. Serious deterioration and obvious swelling of the rubber layer inside the hose: The reason for severe deterioration and obvious swelling of the rubber layer inside the hose is due to the presence of pollutants in the hydraulic system caused by the prolonged use of hydraulic oil or oxidation deterioration. The hose is deteriorated by chemical reactions, and broken rubber pieces will be found at the return port. If this phenomenon occurs, the physical and chemical indicators of the hydraulic oil should be checked, and the compatibility between the system oil and the rubber material inside the hose, as well as whether the working temperature meets the standards, should be checked.