Z2FS6A7-4X/2QV

The Z2FS6A7-4X/2QV throttle check valve belongs to the Z2FS Throttle Check Valves series and is produced by Bosch Rexroth. It meters flow in one direction and permits free return flow, allowing pressure-dependent speed control in hydraulic actuators. The unit fits the ISO 4401-03-02-0-05 subplate pattern, so it can be stacked under directional valves without additional adapters. A nominal size of 6, labeled NG6, defines the port geometry and makes it suitable for compact circuit layouts. The valve withstands operating pressures up to 350 bar, enabling use in high-pressure mobile and industrial circuits. Approved ambient temperatures between -20 and +80 °C ensure reliable operation in unheated shops or warm machinery enclosures. The FKM seals resist mineral oil and many synthetic fluids, maintaining sealing integrity over the specified conditions.

The Z2FS6A7-4X/2QV accepts hydraulic fluid temperatures from -20 to +80 °C, allowing the same thermal limits as the surrounding environment. A usable viscosity range between 10 and 800 mm²/s lets the throttle orifice maintain predictable pressure drops with a wide selection of oils. To avoid premature wear, the system oil must meet ISO 4406 class 20/18/15 cleanliness, which limits particle contamination inside the throttling gap. The valve may be installed in any orientation; this mounting freedom simplifies manifold design and service access. Because there is no locating hole, the subplate bolts alone secure the housing and align the internal channels. Maximum flow capability is 80 l/min, setting the upper boundary for actuator speed when the throttle is fully open. Internal leakage stays under 1 l/min at a differential pressure of 350 bar, so circuit efficiency is not compromised during pressure holding phases.