Rexroth Replacement Hydraulic Valves & Electronic Control Components Classification

1

4WRKE10, 4WRKE16, 4WRKE25, 4WRKE32, 4WRKE35

Valve body: High-strength cast steel (GS-45); Spool: Alloy steel (1.4021) with hard chrome plating; Coil: Copper winding with F-class insulation (155°C); Seal: Fluororubber (FKM)

1. Spool jamming due to hydraulic fluid contamination (particle size >10μm, exceeding ISO 4406 Class 16/13); 2. Coil burnout from voltage surges or long-term overheating (ambient temperature >60°C)

1. Maintain hydraulic fluid cleanliness at ISO 4406 Class 14/11 or higher, replace high-pressure filters every 500 operating hours; 2. Install surge protectors (rated voltage ±15% of coil nominal voltage) and ensure ventilation around the valve (minimum 10cm clearance for heat dissipation)

2

(Z)DBEE Series

Valve body: Stainless steel (1.4301); Pressure relief piston: Alloy steel (1.7225) with nitriding treatment; Spring: Chrome silicon steel (55CrSi); Seal: EPDM

1. Pressure relief piston wear from abrasive particles in hydraulic fluid; 2. Seal leakage due to incompatibility with hydraulic fluid additives (e.g., anti-wear agents, corrosion inhibitors)

1. Use hydraulic fluid that meets DIN 51524 Part 2 standard, test additive compatibility with seals before use; 2. Install a 5μm fine filter upstream of the valve to remove abrasive particles

3

3DREPE6 Series

Valve body: Aluminum alloy (AlMgSi1) with anodized coating; Spool: Titanium alloy (Ti6Al4V); Coil: Copper winding with H-class insulation (180°C); Seal: PTFE

1. Spool wear from cyclic pressure loading (≥10⁶ pressure cycles); 2. Valve body corrosion from moisture intrusion in humid environments (relative humidity >85%)

1. Limit pressure cycle frequency to ≤5 cycles/second, conduct fatigue testing per ISO 10770-1 every 12 months; 2. Install the valve in a moisture-proof control cabinet (IP65 rating) and inspect cabinet sealing monthly

4

4WRAE6, 4WRAE10

Valve body: Ductile iron (GGG40); Spool: Alloy steel (1.4125) with plasma nitriding; Coil: Copper winding with F-class insulation; Seal: Nitrile rubber (NBR)

1. Coil damage from electromagnetic interference (EMI) in industrial environments; 2. Spool sticking due to thermal expansion and contraction in extreme temperature environments (-20°C to 80°C)

1. Use shielded cables for coil power supply and ground the cable shield at both ends; 2. Maintain operating temperature within -10°C to 60°C, install heat insulation or heating devices if necessary

5

4WREE6**, 4WREE10** (4WREE6**-2X/ G24*/*, 4WREE10**-2X/ G24*/*)

Valve body: High-strength aluminum alloy (6061-T6); Spool: Alloy steel (1.4028) with hard chrome plating; Coil: Copper winding with F-class insulation; Seal: FKM

1. Seal aging and leakage due to high hydraulic oil temperature (exceeding 70°C); 2. Pressure sensor drift (integrated in valve) due to vibration from mechanical equipment

1. Control hydraulic oil temperature below 65°C using a cooling system, check oil temperature daily; 2. Install vibration-damping mounts under the valve (damping rate ≥80% for 10-100Hz vibration)

6

4WRKE10*-*, 4WRKE16*-*, 4WRKE25*-*, 4WRKE32*-*, 4WRKE35*-* (4WRKE10*-* /G24*/*, 4WRKE16*-* /G24*/*, etc.)

Valve body: GS-45 cast steel; Spool: 1.4021 alloy steel with hard chrome plating; Coil: Copper winding with F-class insulation; Seal: FKM

1. Spool wear from long-term high-pressure operation (exceeding 80% of rated pressure); 2. Valve body thread damage during installation (over-tightening)

1. Monitor system pressure to ensure it does not exceed 75% of the valve's rated pressure; 2. Use torque wrenches for installation, following DIN 24342 torque specifications (15-25 N·m for M16 threads)

1

VT-11032, VT-11118

Housing: ABS engineering plastic (UL94 V-0 flame retardant); Circuit board: FR-4 epoxy resin; Components: Industrial-grade resistors/capacitors (125°C rated); Connectors: Gold-plated copper alloy

1. Circuit board corrosion from moisture and chemical fumes in industrial environments; 2. Connector loosening due to mechanical vibration (frequency 10-50Hz)

1. Install in a sealed control cabinet with desiccant, maintain relative humidity ≤60%; 2. Use locking connectors and inspect connection tightness monthly using a torque screwdriver

2

VT-2000, VT-3000, VT-3006, VT-3013, VT-3014, VT-3017, VT-3018

Housing: Aluminum alloy (6063-T5) with anti-corrosion coating; Circuit board: FR-4 epoxy resin; Components: Industrial-grade integrated circuits (IPC-A-610 compliant); Connectors: Silver-plated copper alloy

1. Component burnout from voltage surges in power supply (exceeding ±15% of nominal voltage); 2. Overheating due to poor ventilation in control cabinets

1. Install power surge protectors (Type 2) at the input end of the control system; 2. Ensure minimum 5cm clearance around the component for air circulation, install cabinet fans if necessary

3

VT-5001, VT-5002, VT-5003, VT-5004, VT-5005, VT-5006, VT-5007, VT-5008, VT-5010, VT5035

Housing: ABS engineering plastic (UL94 V-0 flame retardant); Circuit board: FR-4 epoxy resin; Components: High-precision operational amplifiers (offset voltage ≤5μV); Connectors: Copper alloy with tin plating

1. Signal distortion from electromagnetic interference (EMI) from nearby high-voltage cables; 2. Circuit board damage from static electricity during maintenance

1. Route signal cables away from high-voltage cables (minimum distance ≥30cm) or use shielded signal cables; 2. Use anti-static wristbands and tools during maintenance, ground the maintenance workstation

4

VT-3002-2X/48F, VT-3002-2X/32D

Housing: Aluminum alloy (6063-T5) with anti-corrosion coating; Circuit board: FR-4 epoxy resin; Components: Industrial-grade power modules (efficiency ≥90%); Connectors: Gold-plated copper alloy

1. Power module overheating due to high load current (exceeding rated current); 2. Connector corrosion from salt spray in coastal industrial environments

1. Monitor load current to ensure it does not exceed 90% of the component's rated current; 2. For coastal applications, apply anti-corrosion spray to connectors and inspect monthly for rust

5

VT-VSPA1-1, VT-VSPA2-1/T1, VT-VSPA2-1/T5, VT-VSPA2-50/T1, VT-VSPA2-50/T5, VT-VRPA2-1/T1, VT-VRPA2-2/T1

Housing: ABS engineering plastic (UL94 V-0 flame retardant); Circuit board: FR-4 epoxy resin; Components: Proportional amplifier chips (gain accuracy ±1%); Connectors: Gold-plated copper alloy

1. Amplifier chip damage from reverse polarity connection during maintenance; 2. Signal drift from temperature changes (ambient temperature >40°C)

1. Verify power supply polarity before connection (follow the wiring diagram strictly); 2. Install in a temperature-controlled environment (0-40°C) and calibrate signal output quarterly per IEC 60721-3-3

1

4WRPEH6C3 B04/12/24/40L-2X/ G24K0A1/F1*

Valve body: High-strength cast steel (GS-45); Spool: Alloy steel (1.4021) with hard chrome plating; Coil: Copper winding with F-class insulation; Seal: FKM; Pressure compensation component: Ceramic (Al₂O₃)

1. Spool wear from hydraulic fluid contamination (particle size >5μm); 2. Pressure compensation component damage from sudden pressure spikes (exceeding 120% of rated pressure)

1. Use hydraulic fluid meeting ISO 4406 Class 13/10, replace high-precision filters every 300 operating hours; 2. Install pressure relief valves upstream to limit pressure spikes to ≤110% of rated pressure

2

4WRPEH6C4 B04/12/24/40L-2X/ G24K0A1/F1*

Valve body: GS-45 cast steel; Spool: 1.4021 alloy steel with hard chrome plating; Coil: Copper winding with F-class insulation; Seal: FKM; Pressure compensation component: Ceramic (Al₂O₃)

1. Seal leakage due to incompatible hydraulic fluid additives; 2. Coil overheating from long-term continuous energization

1. Test hydraulic fluid additive compatibility with FKM seals before use (per ASTM D471); 2. Avoid long-term continuous energization when the valve is not in operation, implement intermittent control if possible

3

4WRPEH10C3 B50/100L-2X/ G24K0A1/F1*

Valve body: Ductile iron (GGG50); Spool: Alloy steel (1.4125) with plasma nitriding; Coil: Copper winding with F-class insulation; Seal: FKM; Pressure compensation component: Ceramic (Al₂O₃)

1. Spool sticking due to thermal expansion and contraction in extreme temperature environments; 2. Valve body deformation from improper mounting (uneven mounting surface)

1. Maintain operating temperature within -5°C to 60°C, install thermal insulation if necessary; 2. Ensure mounting surface flatness ≤0.02mm/m (per DIN 24342), use shims for adjustment if needed

4

4WRPEH10C4 B50/100L-2X/ G24K0A1/F1*

Valve body: GGG50 ductile iron; Spool: 1.4125 alloy steel with plasma nitriding; Coil: Copper winding with F-class insulation; Seal: FKM; Pressure compensation component: Ceramic (Al₂O₃)

1. Pressure compensation component wear from long-term high-flow operation; 2. Connector loosening due to mechanical vibration from nearby machinery

1. Monitor flow rate to ensure it does not exceed 90% of the valve's rated flow for extended periods; 2. Use vibration-damping mounting brackets and locking connectors for coil wiring