Bosch Rexroth | SL30PA4-4X
SL30PA4-4X/
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The SL30PA4-4X/ valve belongs to the Hy-Check Valves series from Bosch Rexroth and is intended to manage reverse flow paths in hydraulic automation. Its nominal size is NG32, making it suitable for high-capacity manifolds that follow the ISO 5781-09-13-0-16 porting pattern. Subplate mounting allows straightforward replacement without disturbing pipework. Flow from A to B is free, while flow from B to A is blocked until the pilot signal opens the poppet, and a cracking pressure of 10 bar determines the point at which initial movement begins. A pre-opening feature moderates pressure shocks during that transition. The control area A1 measures 5.72 cm², defining the force developed by pilot pressure. Continuous operation is permitted up to 315 bar, accommodating many industrial power units. When mounted, the unit adds 7.8 kg to the manifold load.
The valve sustains a maximum flow of 550 l/min, enabling large-volume circuits to operate without excessive pressure loss. Pilot control can be applied at pressures up to 315 bar, and the required pilot oil is returned externally so return flow does not enter the main body. System fluid must meet cleanliness class ISO 4406 20/18/15 to protect the sealing edges. The pilot cavity at port X holds 19.27 cm³, while port Y holds 17.5 cm³; these volumes assist designers in timing calculations for opening responses. The mean time to dangerous failure is 150 years, providing a long reliability interval for safety-related assessments.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Control Area A1
5.72 cm2
Cracking Pressure
10 bar
Direction Of Flow
A→B Free; B→A By Opening
Maximum Flow
550 l/min
Maximum Operating Pressure
315 bar
Maximum Pilot Pressure (p)
315 bar
Mounting Type
Subplate Mounting
Mttfd
150 years
Nominal Size
NG32
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
Yes
Weight (subplate Mounting)
7.8 kg
1620 Old Apex Road
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