Bosch Rexroth | 4WRTE16V1-125L-4X6EG24ETK31A5M
4WRTE16V1-125L-4X/6EG24ETK31/A5M
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The 4WRTE16V1-125L-4X/6EG24ETK31/A5M valve belongs to the 4WRTE Directional Control Valves series and is manufactured by Bosch Rexroth for hydraulic automation that requires precise spool positioning. Its nominal size of NG 16 defines the flow section and mounting envelope, while a 6E proportional solenoid pilot valve provides the driving force for spool movement. The built-in A5 electronics interface accepts a ±10 V command and includes an enable signal on pin C so that external controllers can modulate flow continuously. A nominal supply of 24 V DC powers the electronics, and the coil draws up to 1.6 A during peak demand. Connection to the machine harness is made through a DIN EN 175201-804 (K31) plug, and an IP65 housing shields internal parts from dust and water jets. Hysteresis is held to ≤ 0.1 %, and response sensitivity to ≤ 0.05 %, allowing small input changes to translate into accurate flow adjustments without noticeable deadband.
The main stage withstands 350 bar on ports P, A, and B so the unit can operate in high-pressure circuits, while a recommended maximum flow of 460 l/min keeps differential losses within design limits. Pilot oil requirements are 14 l/min for a full 0–100 % stroke at 315 bar, and both supply and return for this pilot stage are routed internally, removing the need for external pilot lines. Return port T can tolerate up to 250 bar when piped externally, but internal return operation must be limited to less than 10 bar. Hydraulic fluid cleanliness is restricted to ISO 4406 class 18/16/13 to protect the precision-ground spool lands from wear and to maintain the stated dynamic characteristics.
Technical Specifications
Cleanliness Class
ISO 4406 18/16/13
Current Consumption Max
1.6 A
Electrical Connection
DIN EN 175201-804 (K31)
Electronics Interface
A5 (±10 V, enable pin C)
Hysteresis
≤ 0.1%
Max Operating Pressure (p,a,b)
350 bar
Maximum Flow (recommended)
460 l/min
Nominal Size
NG 16
Pilot Oil Flow
14 l/min (step 0–100%, 315 bar)
Pilot Oil Supply/return
Internal/Internal (ET)
Pilot Valve Type
6E (Proportional Solenoid)
Port T Return Pressure (external)
250 bar
Port T Return Pressure (internal)
<10 bar
Protection Class
IP65
Response Sensitivity
≤ 0.05%
Supply Voltage Nominal
24 V DC
1620 Old Apex Road
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