Full definition
A hydraulic reservoir is a crucial component in hydraulic systems, serving as a storage tank for hydraulic fluid. Its primary functions include cooling the fluid, allowing for air separation, facilitating particle settling, and enabling degassing. The design and size of the reservoir significantly impact the efficiency and performance of the hydraulic system. The recommended volume for a hydraulic reservoir is typically 3 to 5 times the rated flow of the pump, measured in liters relative to liters per minute (l/min). This ratio ensures an adequate supply of fluid for peak demands while providing sufficient space for fluid expansion and the release of trapped air.
The hydraulic reservoir is equipped with several key features to enhance its functionality. A breather or filler cap with an air filter prevents contamination from external particles while allowing air to enter or escape as fluid levels change. A sight glass provides a visual indicator of the fluid level, enabling operators to monitor the reservoir's status at a glance. Additionally, a thermometer is often included to monitor fluid temperature, which is critical for maintaining optimal viscosity and ensuring the hydraulic system operates within its designed temperature range. A drain plug facilitates easy fluid changes or maintenance, and internal baffles help reduce fluid turbulence and promote settling of particulates.
Typically constructed from welded steel, hydraulic reservoirs may undergo internal treatments like phosphating or galvanizing to prevent corrosion and enhance durability. The choice of material and treatment is vital, especially in demanding industrial environments where exposure to various chemicals and temperatures can occur. Proper maintenance of the reservoir is essential to prevent fluid contamination and ensure the longevity and efficiency of the hydraulic system. Regular inspections and adherence to relevant standards, such as ISO 4413 and NFPA T3.16.2, help ensure that reservoirs are designed and maintained to meet industry requirements for safety and performance.