SL6PB3-6X/

The SL6PB3-6X/ belongs to the Hy-Check Valves series produced by Bosch Rexroth for hydraulic automation circuits where reverse flow must be blocked and released on command. The valve uses subplate mounting in combination with the ISO 4401-03-02-0-05 and ISO 5781-03-04-0-00 port pattern so it can be bolted directly into standard manifolds. A nominal size of 6 defines the interface dimensions and limits pressure drop. The design withstands a maximum operating pressure of 31.5 MPa, enabling service in high-pressure systems. A cracking pressure of 0.6 MPa determines the minimum upstream pressure required to unseat the poppet when no pilot signal is present, while a maximum flow capacity of 60 l/min covers medium-duty actuator circuits. Because the installation position can be any orientation, machine builders have freedom to place the valve wherever space allows.

System oil cleanliness must reach ISO 4406 (c) 20/18/15 to protect internal sealing surfaces from wear and maintain leak-free closure. Acceptable hydraulic media are HL, HLP, or HVLP oils specified in DIN 51524, giving users a choice among mineral or enhanced-viscosity fluids. An external pilot oil return prevents pilot chamber pressure from feeding back into the main line, helping the poppet close positively when the signal is removed. Pilot chamber volumes are 0.68 cm³ at port X and 0.58 cm³ at port Y; these figures allow designers to calculate the required pilot flow and response time. The unit is supplied with no preopening so the seat stays fully closed until the pilot signal acts, ensuring zero bypass during idle periods.