Bosch Rexroth Valves of type Z3DR are pilot-operated 3-way pressure reducing valves in sandwich plate design with pressure limitation of the actuator. They serve for reduction and control of secondary pressure.
HYDAC offers a wide range of direct acting and pilot operated Relief and Reducing Valves. In general, the direct acting valves are faster in response while pilot operated valves have flatter pressure/flow characteristics. HYDAC Relief Valves are available in direct acting poppet and pilot operated spool types with optional pressure adjustment ranges up to 6000 psi (420 bar). Models are available for flow rates up to 80 gpm (300 l/min). A screw-in cartridge, direct acting, poppet type relief valve intended for use as pressure limiting device in hydraulic circuits which require low internal leakage and fast response to pressure changes.