Bosch Rexroth | FES40CA-3X670LK4M
FES40CA-3X/670LK4M
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The FES40CA-3X/670LK4M is a throttle valve in the FES Throttle Valves series produced by Bosch Rexroth for hydraulic automation where accurate flow restriction is required. Its size 40 format allows direct mounting in high-capacity manifold cavities, while the maximum operating pressure of 315 bar lets the main stage work in heavy-duty circuits without derating. Flow is intended to pass from port A to port B with the pilot line X tied to port A, so installation must follow this orientation. A nominal flow of 670 L/min at a 10 bar pressure drop provides the reference metering point for system designers, and at least 15 bar inlet pressure is needed to keep the throttle stable. A pilot oil volume of 12 cm³ moves the spool from fully closed to fully open, allowing predictable response time. To protect internal edges, the main flow path demands oil cleanliness no worse than ISO 4406(c) 20/18/15.
The valve can pass up to 680 L/min at the same 10 bar differential when full capacity is required, offering a small safety margin above the nominal figure. Pilot control parts accept pressure to 315 bar, matching the main stage so auxiliary circuitry can share the same supply. Operation is limited to mineral oil grades HL or HLP according to DIN 51524, and the medium may range from –20 °C to +80 °C for use in typical mobile or industrial environments. A viscosity window of 15 to 380 mm²/s covers common hydraulic oils and ensures stable throttling characteristics. NBR seals are fitted to withstand mineral oil exposure and maintain leakage integrity. The assembly weighs 8.2 kg, light enough for single-person handling during service. For the pilot passages, a tighter cleanliness level of ISO 4406(c) 17/15/12 is required to keep the small orifices free from blockage.
Technical Specifications
Cleanliness Class Main
20/18/15 (ISO 4406(c))
Cleanliness Class Pilot
17/15/12 (ISO 4406(c))
Direction Of Flow
A→B (X connected to A)
Hydraulic Fluid
Mineral Oil (HL, HLP) (DIN 51524)
Hydraulic Fluid Temp Range
–20 to +80 °C
Max Flow (a→b)
680 L/min at Δp 10 bar
Max Operating Pressure
315 bar
Max Pilot Pressure (x)
315 bar
Min Inlet Pressure (a→b)
15 bar
Nominal Flow
670 L/min at Δp 10 bar
Pilot Oil Volume (0→100%)
12 cm³
Seal Material
NBR
Size
40
Viscosity Range
15 to 380 mm²/s
Weight
8.2 kg
1620 Old Apex Road
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