SL6PB4-6X/

***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 SL6PB4-6X (R900597726) is a sophisticated isolator valve designed for subplate mounting and is optimal for applications requiring leak-free blocking of an actuator port, even over extended periods of inactivity. This valve is characterized by its robust construction, which includes a housing, seat poppet, compression spring, and control spool. It offers the flexibility of being used without external pilot pressure for flow from direction A to B when the condition pA > pB (cracking pressure of the compression spring) is met. For reverse flow, it ensures hydraulic tightness. The control spool's movement, influenced by sufficient pilot pressure at port X, allows the seat poppet to disengage from its seat, enabling free flow in both directions when actively keeping the valve open. The design considerations for pressure and area ratios at the control spool and seat poppet are critical for proper functioning. There are two primary versions of this valve: Version A with preopening and Version B without preopening. Version A features a two-stage setup with increased control open ratio that allows secure unloading even at low pilot pressures while mitigating switching shocks through dampened decompression. This version is particularly beneficial in reducing premature wear on components and noise generation. Conversely, Version B may experience sudden unloading of included pressure volume leading to potential switching shocks. This model also offers the possibility to convert from type SV to type SL by exchanging plugs—ensuring one plug remains installed. It complies with ISO standards for porting patterns and provides options such as various cracking pressures and corrosion-resistant designs. Individual check valve installation sets are available as well. In summary, the Bosch Rexroth SL6PB4-6X isolator valve stands out for its reliability in maintaining leak-free conditions at an actuator port and its versatility in accommodating different system requirements with or without preopening features.