Hydraulic hoses are available in various diameters, such as 20mm and 60mm. These hoses offer excellent sealing and pressure resistance, can withstand high-pressure water, and have good oil resistance. Furthermore, due to their small diameter, they provide good pressure compensation and buffering for hydraulic systems. Simultaneously, the small outer diameter (typically 4-6mm) gives the hose good strength and toughness. Therefore, the hose can withstand various pressure loads such as impact, vibration, and temperature changes.
- There are many types of hoses, including single-sided, double-sided, inner-layer, and outer-layer.
These are all important components of a hose system. However, they are closely related. Hoses are primarily composed of flexible materials and can withstand high pressure, sealing, and friction. They can also be adjusted and bent. Due to their special shape and flexibility, they possess many advantages that other materials cannot match.
- Hydraulic piping systems experience significant stress; therefore, when selecting hoses, attention should be paid to choosing hoses of different materials and specifications.
Generally, soft rubber hoses can withstand relatively low pressure. For example, a typical hose can withstand a pressure of 20 kPa, but to prevent damage, its length is generally 30-50 mm. Some users may have a misconception that longer hoses are better, but this is not the case. A hose is composed of a uniform, dense rubber skeleton from the inside out. The main function of a rubber hose is to connect fluids to joints, providing sealing and buffering. Its most important features are excellent sealing and pressure resistance, making it less susceptible to damage from gases, liquids, air, and impurities in the external environment, which could lead to media leakage or pipe bursts. Therefore, hoses are needed to compensate for large system pressure changes. Under certain special requirements (such as operating temperature and liquid corrosivity), oil-resistant materials must be selected; if an extended service life is required, the hose structure must be made of pressure-resistant materials to better fulfill its function.
- The required sealing performance of hoses varies depending on the working environment.
In highly corrosive environments, hoses should have good oil and acid/alkali resistance, should not withstand high pressure, and should be leak-free. For corroded metal hoses, such as metal-reinforced hoses and fiberglass hoses, high water pressure is unacceptable. This necessitates hose materials with high strength and toughness. This is also an effective measure to prevent hose aging and quality degradation. Furthermore, the hose must not be damaged by water pressure during operation. Therefore, when selecting hydraulic hoses, choose materials with good performance, corrosion resistance, and sufficient thickness. This ensures the hose can withstand pressure deformation and act as a buffer, preventing potential leaks. It should also have good pressure resistance and excellent corrosion and wear resistance in various liquids.
- Piping systems should avoid excessive accumulation or flow of pipe material inside the hose.
The smaller the hose diameter, the smaller its bending deformation capacity, and the different bending radii it can withstand under different loads. If a flexible joint has a small diameter, the system will not meet requirements during use because it cannot withstand high pressure. Therefore, appropriate diameters and pipe sizes should be selected during design to meet the performance requirements of the hydraulic system. Using hoses that are too large or too small will reduce product quality and shorten lifespan (e.g., a one-meter hose must be bent during installation). In addition, gaskets made of high-temperature resistant materials should be used to prevent damage during use. Otherwise, leaks can easily occur and damage the entire system. For diameters greater than 6mm that are frequently rotated and bent, longer plastic or copper pipes should be used. For even better performance, stainless steel fittings, plastic pipes, stainless steel strips, or other high-temperature resistant materials can be used. This is to prevent air and water from entering the seals and causing system leaks.
- Connections must be arranged reasonably to meet the needs of various hydraulic equipment or the rapid and flexible rotation and movement between equipment.
Hydraulic hoses are mainly made of polytetrafluoroethylene (PTFE) with an outer coating of an impact-resistant adhesive. Unlike other rubbers, this material has good corrosion resistance, high strength, and oil resistance. This type of hose has high mechanical properties and excellent tear resistance. Hydraulic hoses for hydraulic equipment, while meeting high pressure resistance requirements, cannot meet the following requirements: withstand high-pressure liquids; withstand impact and temperature changes; possess good oil resistance; acid and alkali resistance; have excellent elasticity and tensile strength (typically 15~25N); good oil and chemical resistance; and will not rust. In most cases, wear resistance is not required. Hydraulic hoses generally possess good corrosion and oil resistance; resistance to mechanical stress and abrasion; and can withstand impact and vibration.