The OFS inlet strainer is installed on the suction port inside of tank. It prevents ingress of foreign particles to protect pump.
Data sheet
OFR
Return line filters.
The OFR is used in the return line of hydraulic systems. A bypass valve is incorporated in the OFR which is actuated to bypass flow when the pressure drop increases.
Data sheet
ABT
Air bleed valves.
The ABT valve enables air bleed from hydraulic circuits.
The valve closes when circuit pressure exceeds 0.14 MPa.