The SRFB filter consists of two single-tube filters, a switching valve, a bypass valve, a sensor, and a diffuser. It is installed at the top, side, or bottom of the oil tank, allowing for filter element replacement without system shutdown. It is suitable for fine filtration of return oil in continuously operating hydraulic systems, effectively removing metal particles generated from wear and rubber impurities from seals, ensuring that the oil returning to the tank remains clean for effective circulation within the system.

When the filter element of one filter becomes clogged, causing a pressure difference of 0.35 MPa, the sensor sends a signal. At this point, the switching valve is turned to activate the standby filter, allowing for the replacement of the clogged filter element.

If the clogged filter element cannot be replaced promptly, and the pressure difference rises to 0.4 MPa, the bypass valve automatically activates to protect both the filter element and the system. However, users should replace the filter element as soon as possible. Due to the presence of a check valve, when the filter is installed on the side or bottom of the oil tank, replacing the filter element will not cause oil to flow out of the tank. The diffuser, located at the bottom of the return cylinder, ensures that the returning medium flows smoothly into the tank, minimizing air entrapment and reducing the disturbance of settled contaminants.

The filter element utilizes advanced synthetic fiber filtering materials, offering high filtration precision, large flow capacity, low initial pressure loss, and high dirt-holding capacity. Its filtration precision is rated as absolute, with a filtering ratio of β3, 5, 10, 20 ≥ 200 and a filtering efficiency n ≥ 99.5%, meeting ISO standards.