ZSF80F1-1-1X/M/01

The ZSF80F1-1-1X/M/01 is a prefill valve produced by Bosch Rexroth and belongs to the ZSF Prefill Valves series. It handles rapid tank filling and discharge cycles in hydraulic presses and similar automation circuits. The valve mounts by a flange connection, allowing a rigid interface with manifold plates. Threaded ports follow ISO 228-1, so common pipe fittings align without adapters. Port P uses a G3/4 thread to accept the pump line, supporting standard high-flow connections. Port X is tapped G1/4 to attach the pilot line that opens the main poppet when control pressure is applied. NBR sealing material resists mineral hydraulic oil and provides dependable leakage control. A maximum pressure of 16 bar at port A prevents the tank side from exceeding safe limits during prefill. Port B/p tolerates up to 350 bar, enabling high-pressure working strokes after the cavity is closed. The assembly weighs 10 kg, a factor considered when sizing mounting bolts and support brackets.

The control spool in this model presents an area of 10.18 cm² and moves through a 13.0 mm stroke, creating the pilot flow that lifts the main poppet. The main poppet offers 49.02 cm² of effective area and travels 17.0 mm to open a large passage for fast oil exchange between cylinder and reservoir. A pilot poppet area of 2.54 cm² provides the differential surface needed to initiate opening with modest pilot pressure. The pilot chamber volume is 13.2 cm³, so only a limited amount of fluid is required for each switching event, which shortens response time. An internal nozzle with a 1.0 mm diameter meters pilot flow to prevent pressure spikes during actuation. Port X can be pressurized up to 150 bar, giving ample pilot force to overcome return loads on the main poppet. These flow-related dimensions and pressure limits work together to achieve reliable, high-speed prefill operation in heavy-duty hydraulic machinery.