The many functions of a reservoir within a hydraulic system

The reservoir in a hydraulic system has the main function of containing the system’s fluid in a convenient location for the pump inlet. It also holds excess fluid which is needed when the system is in operation, such as when an accumulator is being charged or a cylinder extended.

Other than holding the fluid, the reservoir also performs other important functions within the hydraulic system. These include:
• The reservoir cools the hydraulic fluid by having a large surface area to transfer the heat from the fluid to the surrounding area.
• Most hydraulic reservoirs have an internal baffle which is used to circulate hot, dirty and aerated turbulent fluid from the system return side of the reservoir to the cooler pump inlet side. This movement of fluid around and through the baffle allows the fluid contaminants to settle at the bottom of the tank and for the air trapped in the fluid to separate and rise to the fluid surface.
• The baffle also provides a physical barrier that separates fluid entering the reservoir from the fluid entering the pump suction line.
• There is access available to remove used fluid and contaminants from the system and to add new fluid.
• The reservoir also serves as a mounting surface for system components such as the pump assemblies, filters accumulators, manifolds and electrical control panels.
• During peak periods of the operating cycle the reservoir provides storage of large volumes, as well as provides space for hot-fluid expansion, gravity drain-back from the system during shutdown.
For more information on reservoirs for hydraulic systems, Power Team SA are on hand to provide you with expert advice and professional recommendations. With decades within the hydraulic industry as one of South Africa’s top hydraulic component suppliers, Power Team SA is on hand to assist with all your reservoir and hydraulic needs.