Bosch Rexroth Z2FS 6-2-41 1Q Hydraulic Flow Control Throttle Check Valve

The Bosch Rexroth Z2FS6-2-4X/1Q is a twin throttle check valve (sandwich-type) from the Z2FS family, combining flow control with backflow prevention in a compact cartridge suitable for installation in hydraulic manifolds. The size 6 configuration is designed for ISO NG6 porting and is offered in the 1Q version, which denotes a pilot-flow limitation for fine adjustment of the controlled flow. This valve is described as a sandwich valve with NBR seals and is intended to regulate hydraulic return flow while preventing reverse flow between circuits. Maximum operating pressure for Z2FS valves in this family can reach up to about 350 bar, with flow capability up to around 400 L/min depending on configuration, making it suitable for demanding industrial and mobile hydraulic systems. The 1Q variant enables finer control of the pilot flow, which is useful for precise actuator speed regulation in applications ranging from machine tools to material-handling equipment. Porting follows ISO 4401-03-02-0-05 patterns, enabling straightforward integration into standard manifolds, and part numbers like Z2FS6-2-4X/1Q and Rexroth catalog references such as R900481621 illustrate the same model family. Common applications include throttling in one direction with built-in reverse-flow protection, such as actuators, clamps, and winches in hydraulic systems where controlled return flow and reliable check-function are required.