Bosch Rexroth | SL30PB1-4XV
SL30PB1-4X/V
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The SL30PB1-4X/V check valve is produced by Bosch Rexroth as part of the Hy-Check Valves series. It serves in hydraulic automation circuits to permit controlled flow toward actuators while blocking return flow. The unit is built in size NG32 to match corresponding manifold cavities, and it attaches through subplate mounting using the ISO 5781-09-13-0-16 porting pattern. In operation, flow moves freely from port A to port B, while flow from port B to port A is possible only when the pilot opens the poppet, establishing directional logic. The valve opens at a cracking pressure of 2.5 bar so minimal upstream pressure is required to initiate forward flow, yet it withstands a maximum operating pressure of 315 bar to suit high-pressure installations. It accommodates flow rates up to 550 l/min without exceeding rated limits, and FKM seals are fitted to maintain compatibility with common hydraulic fluids.
The design is supplied without pre-opening, so reverse flow remains blocked until the pilot line actuates the poppet. Cleanliness requirements are limited to ISO 4406 class 20/18/15 to protect internal surfaces from abrasion. Because the installation position can be any orientation, the valve offers flexibility during manifold layout. Pilot oil returns externally, allowing separate routing of pilot fluid to tank. The pilot chamber at port X has a volume of 19.27 cm³, and the chamber at port Y holds 17.5 cm³; these values indicate the fluid capacity that must be displaced during actuation and assist in timing calculations. The subplate weighs 7.8 kg, contributing to overall assembly mass yet enabling manual handling during service. A mean time to dangerous failure of 150 years reflects the long service life expected under specified operating conditions.
Technical Specifications
Cleanliness Class (iso 4406)
20/18/15
Cracking Pressure
2.5 bar
Flow Direction
A→B Free; B→A By Opening
Installation Position
Any
Max Operating Pressure
315 bar
Maximum Flow
550 l/min
Mttfd
150 years
Pilot Oil Return
External
Pilot Volume Port X
19.27 cm3
Pilot Volume Port Y
17.5 cm3
Porting Pattern
ISO 5781-09-13-0-16
Pre-opening
Without Pre-Opening
Seal Material
FKM
Size
NG32
Type Of Connection
Subplate Mounting
Weight (subplate)
7.8 kg
1620 Old Apex Road
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