M-3SMR6C3X/420

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth M-3SMR6C3X/420 (R900203250) is a direct-operated directional seat valve designed to control the start, stop, and direction of fluid flow within hydraulic systems. This model features mechanical actuation through a roller plunger and offers safe switching capabilities, even after prolonged periods of being under pressure without movement. The valve system includes a hardened valve assembly and a ball spool as the closing element, ensuring durability and reliable performance. The M-3SMR6C3X/420 operates based on the principle that in its initial position, the ball spool is held against the seat by a spring force until actuated. This design allows for pressure compensation between the actuating forces or return spring due to the chamber connected to port P. As such, this valve can be used at high pressures up to 420 bar. It's crucial to note that during switching transitions, ports P, A, and T may briefly interconnect due to negative spool overlap; however, this occurs so quickly that it does not impact performance in most applications. Furthermore, this model can be paired with a sandwich plate—referred to as the Plus plate—to achieve additional functionalities akin to those of a 4-way directional seat valve. Depending on whether it's used with or without the Plus plate, various configurations are possible as indicated by symbols P, N, U, C for different initial and spool positions. Optional components such as throttle inserts or check valve inserts can be integrated into port P of either the valve or Plus plate for flow regulation or to permit free flow in one direction while preventing backflow. Designed with porting patterns according to DIN form A (without locating hole), this versatile component is suitable for various hydraulic applications where precise control over fluid direction is required. Additionally, it offers optional inductive position switches for contactless detection of spool position—an essential feature for automation and control purposes within complex hydraulic systems.