Bosch Rexroth | 4WRH16E150-7XM
4WRH16E150-7X//M
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The 4WRH16E150-7X//M valve belongs to the WRZ Proportional Directional Valves series from Bosch Rexroth and is installed in hydraulic automation systems to meter flow and shift actuator direction proportionally to an electrical command. It is built in nominal size 16, giving passage areas suited for mid-range power units. A nominal flow of 150 l/min at a 10 bar pressure drop allows the main stage to supply cylinders or motors without excessive throttling losses. The valve body withstands a maximum operating pressure of 350 bar so it can be placed on high-pressure main lines, while port T is limited to 250 bar to protect the return circuit from overload. Connection is made on a subplate interface that follows ISO 4401-07-06-0-94, and the subplate mounting method simplifies replacement without disturbing pipework. Each service port uses a 20 mm diameter to match the specified flow rating, and NBR sealing material keeps mineral hydraulic oil contained under dynamic conditions.
Maintaining internal cleanliness to ISO 4406 class 20/18/15 extends spool life and prevents jamming by limiting the number of particles in the main stage. The hydraulic circuit must use mineral oil of type HL or HLP according to DIN 51524 so that elastomers and clearances remain compatible. Port Y may only see 30 bar, ensuring the pilot drain line can return oil without excess backpressure. Both pilot supply and pilot drain are external, giving the designer freedom to select a stable control pressure independent of main flow conditions. During a full stroke change the pilot stage passes 5.5 l/min and displaces 4.6 cm³, data required for sizing the upstream servo valve and accumulators and for predicting response time. A pilot pressure limit of 25 bar protects the main valve from uncontrolled spool forces and contributes to consistent proportional behavior across the operating range.
Technical Specifications
Cleanliness Class (main Valve)
ISO 4406 20/18/15
Hydraulic Fluid
Mineral Oil (HL, HLP) DIN 51524
Max Operating Pressure
350 bar
Max Port T Pressure
250 bar
Max Port Y Pressure
30 bar
Mounting Interface
ISO 4401-07-06-0-94
Mounting Method
Subplate Mounting
Nominal Flow (Δp 10 Bar)
150 l/min
Nominal Size
16
Pilot Drain
External (Port Y)
Pilot Oil Flow (0→100%)
5.5 l/min
Pilot Oil Volume (0→100%)
4.6 cm³
Pilot Pressure Limit (main Valve)
25 bar
Pilot Supply
External
Port Diameters (a/b/p/t)
20 mm
Sealing Material
NBR
1620 Old Apex Road
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