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R900071030 Rexroth Solenoid Coil & NG6 Valve Guide
When searching for a R900071030 Rexroth directional spool valve, it is important to verify the material number before ordering. R900071030 is a Bosch Rexroth WZ45-4 solenoid coil rated for 230 V AC, 50/60 Hz, rather than a complete directional spool valve. Bosch Rexroth lists the material number as a solenoid coil, while compatible NG6 directional valves belong to the WE6 family and use separate valve material numbers.
This distinction matters when replacing a failed coil, rebuilding an existing NG6 valve, or sourcing a complete hydraulic directional control valve. Ordering by the material number alone without checking the valve type, spool symbol, voltage, and connector can result in an incompatible component.
What Is R900071030 and How Does It Relate to an NG6 Valve?
R900071030 is a WZ45-4 solenoid coil for Bosch Rexroth hydraulic valves, specified for 230 V AC at 50/60 Hz. It is the electrical actuation component rather than the complete hydraulic valve body.
A solenoid coil converts electrical energy into the magnetic force required to actuate the valve’s internal mechanism. The hydraulic valve body then determines how oil is routed between ports such as P, T, A, and B.
For an NG6 system, the complete valve is typically identified through a type designation such as a 4WE6 configuration. Bosch Rexroth’s official WE6 catalog describes these as direct-operated directional valves with solenoid actuation and nominal size 6.
| Item | R900071030 | Typical Rexroth WE6 directional valve |
|---|---|---|
| Component type | Solenoid coil | Complete directional spool valve |
| Function | Electrical actuation | Controls hydraulic flow direction |
| Typical size association | Used with compatible valve assemblies | NG6 / nominal size 6 |
| Voltage | 230 V AC, 50/60 Hz | Depends on selected coil |
| Hydraulic ports | None by itself | P, T, A, B |
| Selection priority | Coil and valve compatibility | Spool symbol, pressure, flow, voltage |
This is why a buyer looking for a Rexroth directional spool valve should not treat R900071030 as the complete valve assembly.
R900071030 Compatibility: What Should You Check?
The most important compatibility check is not simply whether a coil is physically similar. The coil must match the valve’s solenoid interface, electrical requirements, and application conditions.
Before replacing an R900071030 coil, verify these points:
- Valve series: Confirm the exact Rexroth valve family.
- Coil identification: Check that the existing coil is marked WZ45-4 or carries the correct material number.
- Voltage: R900071030 is specified for 230 V AC, 50/60 Hz.
- Connector: Confirm the electrical connector and plug arrangement.
- Valve design: Check whether the existing valve uses a compatible removable-coil arrangement.
- Operating environment: Consider temperature, enclosure requirements, moisture, and contamination.
- Original valve type code: Record the complete valve designation before ordering replacement parts.
A common mistake is matching only the nominal valve size. NG6 compatibility does not automatically mean that every NG6 coil or valve configuration is interchangeable.
Bosch Rexroth’s WE6 range includes different spool symbols, solenoid configurations, electrical connections, and auxiliary options. Its official product selector shows multiple WE6 configurations rather than one universal valve specification.
NG6 Rexroth Directional Spool Valve: Key Selection Parameters
For buyers who actually need a complete NG6 Rexroth directional spool valve, the selection process should begin with the hydraulic circuit rather than the coil part number.
Bosch Rexroth WE6 valves are nominal size 6 products. Typical configurations use the standardized mounting interface associated with ISO 4401 and CETOP installation dimensions. ISO 4401 defines mounting-surface dimensions for four-port hydraulic directional control valves to support interchangeability between compatible designs.
The main parameters to compare are:
1. Spool configuration
The spool determines the flow path in each switching position.
Common Rexroth designations include configurations such as A, C, D, and E, but the exact hydraulic function depends on the selected spool symbol and valve type.
For example, a three-position valve may provide a center position with different relationships between P, T, A, and B. That center condition can affect actuator holding, unloading, or pressure behavior.
2. Operating pressure
Pressure rating must be checked against the actual circuit rather than selected from the maximum catalog figure alone.
Bosch Rexroth documentation for representative WE6 valves lists pressure capabilities up to 350 bar, depending on the exact configuration.
The T-port pressure may also have a different permitted limit from P, A, and B ports. This is particularly important in circuits where return-line pressure is elevated.
3. Flow requirement
Flow capacity affects pressure drop, switching behavior, and system efficiency.
A representative Bosch Rexroth 4WE6 configuration is specified for approximately 80 L/min maximum flow, but the permissible flow depends on the valve configuration and operating conditions.
Do not select a valve solely because its nominal size matches the manifold. The actual flow requirement should be checked against the manufacturer’s performance curves.
4. Electrical voltage
The coil voltage is a separate selection parameter from the hydraulic valve size.
R900071030 is associated with 230 V AC, 50/60 Hz. Other Rexroth valve configurations can use different electrical options, including DC voltages.
For replacement work, verify the machine’s actual control voltage before ordering.
Where Are NG6 Rexroth Directional Valves Commonly Used?
NG6 directional spool valves are used where hydraulic actuators need reliable on/off directional control without requiring a large valve body.
Typical applications include:
- Machine tools
- Clamping and fixture systems
- Injection molding equipment
- Material handling machinery
- Industrial hydraulic power units
- Metal forming equipment
- Mobile hydraulic equipment
- General automation machinery
The correct configuration depends on the actuator and circuit architecture.
For example, a machine-tool clamping circuit may prioritize predictable switching and compact subplate installation. A mobile application may place greater emphasis on environmental protection, vibration resistance, connector configuration, and supply voltage.
The same NG6 mounting size can therefore serve very different engineering requirements.
R900071030 vs. Complete Rexroth Directional Valve
The distinction between a replacement coil and a complete valve is especially important when comparing quotations.
| Buying requirement | What to identify |
|---|---|
| Replace burned-out coil | R900071030 and existing valve compatibility |
| Replace complete NG6 valve | Full Rexroth valve material number and type code |
| Change valve function | Spool symbol and hydraulic circuit |
| Change control voltage | Correct compatible coil and electrical configuration |
| Replace old valve assembly | Mounting pattern, ports, spool, pressure and flow |
| Build a new hydraulic circuit | Valve function first, coil second |
If only the coil has failed, purchasing a complete directional valve may add unnecessary cost.
If the hydraulic spool, valve body, seals, or mounting surface is damaged, replacing only the coil will not solve the underlying problem.
How to Identify the Right Rexroth Replacement
For industrial buyers, the safest approach is to collect the information from the installed component before requesting a quotation.
Recommended identification workflow:
- Photograph the valve and solenoid from several angles.
- Record every visible material number and type code.
- Confirm the electrical voltage and frequency.
- Identify the valve’s nominal size and mounting interface.
- Confirm the spool symbol or hydraulic schematic.
- Check the operating pressure and required flow.
- Compare the existing coil with the replacement specification.
- Request confirmation against the complete valve code before purchase.
This process is more reliable than searching only for a phrase such as “R900071030 directional spool valve.”
The full Rexroth type designation contains information about valve size, spool configuration, series, voltage, manual override, and electrical connection. Bosch Rexroth’s WE6 documentation demonstrates how these individual code elements define the actual valve configuration.
Buying R900071030 or an NG6 Rexroth Valve: What Should You Confirm?
When sourcing this component commercially, the quotation should clearly state whether the supplier is offering the R900071030 coil or a complete directional valve assembly.
For an R900071030 replacement, confirm:
- Bosch Rexroth material number: R900071030
- Coil designation: WZ45-4
- Electrical rating: 230 V AC
- Frequency: 50/60 Hz
- Compatibility with the existing valve
- New, unused, refurbished, or other condition
- Packaging and identification
- Availability and estimated dispatch time
- Return terms for incorrect compatibility
For a complete NG6 directional spool valve, request the full type code and material number.
The supplier should be able to confirm the spool symbol, pressure rating, flow capability, electrical configuration, mounting standard, and connector type rather than quoting only “NG6 Rexroth valve.”
The product page supplied for this article currently presents R900071030 as a Rexroth directional spool valve and lists a broader NG6/NG10 valve portfolio. For purchasing accuracy, buyers should verify the exact component against the manufacturer’s material-number documentation before placing an order.
For buyers evaluating the listed component, the R900071030 product page can be used as a commercial reference, while the Bosch Rexroth material-number information should be treated as the primary technical reference.
Why Material Number Verification Matters
Hydraulic components can look nearly identical while having different electrical or hydraulic characteristics.
A wrong coil voltage can cause immediate electrical problems. A wrong spool configuration can change actuator behavior. An incorrect pressure or flow selection can create excessive pressure drop or unsafe operating conditions.
For this reason, the material number should be treated as an identification starting point, not the entire specification.
For R900071030, the available manufacturer information identifies the part as a WZ45-4 solenoid coil for 230 V AC, 50/60 Hz.
If the requirement is actually a complete Rexroth directional spool valve, the buyer should identify the valve’s complete type code and material number separately.
FAQ
Is R900071030 a Rexroth directional spool valve?
No. R900071030 is identified as a Bosch Rexroth WZ45-4 solenoid coil for 230 V AC, 50/60 Hz. It is an electrical component used with compatible hydraulic valve assemblies.
What is an NG6 Rexroth directional spool valve?
An NG6 Rexroth directional spool valve is a nominal-size-6 hydraulic directional valve, commonly represented by the WE6 family. It uses a spool to control hydraulic flow between the main ports.
Can R900071030 replace any NG6 valve coil?
No. Compatibility must be verified against the exact valve design, coil interface, electrical specification, and manufacturer documentation.
What should I provide when requesting an NG6 Rexroth valve quotation?
Provide the complete valve type code or material number whenever possible. Also include the required spool symbol, operating pressure, flow rate, voltage, connector, and mounting interface.
What is the difference between R900071030 and a 4WE6 valve?
R900071030 identifies a solenoid coil. A 4WE6 is a complete direct-operated directional valve designation. The coil is only one component of the valve assembly.
Does ISO 4401 apply to NG6 hydraulic valves?
ISO 4401 specifies mounting-surface dimensions for four-port hydraulic directional control valves and supports interchangeability between compatible mounting interfaces.
Where can I verify Rexroth material-number information?
Bosch Rexroth provides product documentation, datasheets, manuals, CAD information, and material-number search tools through its official resources.
Reference Sources
- Bosch Rexroth — R900071030 Solenoid Coil
Official product information confirming R900071030 as a WZ45-4 solenoid coil, 230 V AC, 50/60 Hz.
Bosch Rexroth R900071030 Official Product Page - Bosch Rexroth — WE6 Directional Spool Valves
Official product information for the WE6 / NG6 direct-operated directional valve range.
Bosch Rexroth WE6 Directional Valves - Bosch Rexroth — 4WE6 Technical Documentation
Technical information covering nominal size, mounting, pressure, flow, spool configurations, and electrical options.
Bosch Rexroth 4WE6 Technical Data - ISO 4401 — Hydraulic Fluid Power
International standard for mounting surfaces of four-port hydraulic directional control valves.
ISO 4401 Official Standard - Siesource — R900071030 Product Page
The corresponding product page for the target keyword and commercial intent.
R900071030 Rexroth Product Page - Bosch Rexroth — Downloads & Technical Documentation
Official source for Rexroth product catalogs, manuals, datasheets, and technical documentation.
Bosch Rexroth Downloads