***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 DR20-4-4X/200YW95 (R900474888) is a pilot-operated pressure reducing valve designed to modulate system pressure effectively. This valve is characterized by its screw-in cartridge and housing, which can be mounted on a subplate with an optional check valve for free return flow from channel A to B. The DR series operates by allowing hydraulic fluid to flow from the inlet to the outlet channel in its rest position, with the outlet pressure exerted on a spring-loaded side of the main control spool. When the outlet pressure surpasses the spring's set value, the pilot poppet opens, causing fluid to flow into the spring chamber and prompting the main control spool to maintain constant outlet pressure as set by the spring. The pilot oil return is managed externally via port Y. It is important to note that any pressure at port Y will be added to the set reduced pressure. This model comes with various adjustment types, including a rotary knob, sleeve with hexagon and protective cap, lockable rotary knob with scale, and rotary knob with scale. It offers versatility for different applications due to its subplate mounting option conforming to ISO standards and its availability as a cartridge valve for threaded connections. The Bosch Rexroth DR20-4-4X/200YW95 valve stands out for its precision in controlling hydraulic system pressures across various settings while ensuring reliability and durability inherent in Bosch Rexroth's design and engineering.