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The SV30GB1-4X/ check valve is manufactured by Bosch Rexroth for the Hy-Check Valves series to provide directional control in hydraulic automation. It passes fluid freely from port A to port B and requires a pilot signal for reverse flow, giving circuits a secure shut-off when demand stops. The poppet lifts at a cracking pressure of 2.5 bar, balancing tight sealing with quick response. Operation remains stable with fluids between 2.8 and 500 mm²/s, and the body withstands a maximum pressure of 315 bar. A peak flow rate of 550 l/min supports medium to large power units, while an unrestricted installation position lets designers mount the valve in any orientation. The threaded version weighs 10 kg, which eases manual handling during service.
Pilot control enters through port X with a G 1/4 thread and occupies 19.27 cm³, helping achieve consistent switching times. A pilot pressure window of 5 to 315 bar acts on control area A3 of 16.61 cm² to open the valve for flow from port B to port A. Main line connections use a G 1 1/2 thread, matching common pipe dimensions in industrial manifolds. System filtration must hold oil cleanliness to ISO 4406 code 20/18/15 so the seating surfaces stay free of abrasive particles. Adhering to these connection, pressure, and cleanliness limits keeps the valve responsive and leak-tight in high-pressure hydraulic circuits.
Cleanliness Class
ISO 4406 20/18/15
Control Area A3
16.61 cm²
Cracking Pressure
2.5 bar
Flow Direction
A→B Free; B→A Piloted
Installation Position
Any
Maximum Flow
550 l/min
Maximum Operating Pressure
315 bar
Pilot Port X Thread
G 1/4
Pilot Pressure Range
5–315 bar
Pilot Volume (port X)
19.27 cm³
Port A/b Thread
G 1 1/2
Viscosity Range
2.8–500 mm²/s
Weight (threaded)
10 kg
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