Rexroth Meter-in Pressure Compensator ZDC
Description
Reviews
Rexroth ZDC Series Valve Overview
The Rexroth ZDC series is a direct-operated meter-in pressure compensator available in 2-way (P) and 3-way (PT) designs, engineered as a sandwich plate valve for stack mounting with proportional directional valves. Featuring an integrated shuttle valve, it provides load compensation in channels P → A or P → B, maintaining a constant pressure drop across the main valve spool to deliver load-independent flow control.
With a porting pattern fully compliant with ISO 4401, this Rexroth ZDC compensator mounts directly between the proportional directional valve and the subplate, eliminating additional piping and simplifying manifold assembly. It supports both internal and external pilot oil supply configurations, adapting to various circuit layouts. It is widely used in stationary industrial hydraulic systems to achieve stable flow regulation independent of load pressure variations.
Rexroth ZDC Series Key Features
- Integrated Sandwich Mounting Design – Stackable structure mounts directly between the proportional directional valve and subplate, with full ISO 4401 porting compatibility for drop-in assembly, eliminating extra piping and reducing circuit footprint.
- Shuttle Valve Load Compensation – Built-in shuttle valve automatically detects load pressure in P → A or P → B channels, delivering stable meter-in load compensation to achieve load-independent flow regulation.
- 2-Way & 3-Way Circuit Configurations – 2-way "P" version for pressure reducing function; 3-way "PT" version with pressure relief function available for sizes 10, 16, 25 (Size 32 only 2-way P design), adapting to diverse hydraulic circuit layouts.
- Direct-Operated Hydraulic Reliability – Pure hydraulic direct-acting structure delivers consistent response without electrical control components, maintaining steady flow performance under fluctuating load pressures.
- Flexible Application Configurations – Supports internal or external pilot oil supply; standard NBR seals for mineral oil circuits, FKM seals for special fluids on request; seawater-resistant variant available for harsh scenarios.
Rexroth ZDC Series Key Specifications
Specifications apply to ZDC sizes 10, 16, 25, 32, series 2X.
Valve Type: Direct-operated meter-in pressure compensator, 2-way / 3-way designNominal Sizes: 10, 16, 25, 32
Component Series: 2X
Maximum Operating Pressure:
- Ports A, B, P: 350 bar
- Port T: 250 bar
- Port X: 30 – 100 bar
- Port Y: Max 150 bar general; limited to ≤ 30 bar when used with pilot-operated proportional directional valves
Maximum Flow:
- Size 10: 85 L/min
- Size 16: 150 L/min
- Size 25: 325 L/min
- Size 32: 520 L/min
Mounting: Sandwich plate mounting, porting pattern to ISO 4401
Hydraulic Fluid: Mineral oil HL, HLP (to DIN 51524); biodegradable fluids HETG, HEPG, HEES; other fluids on request
Standard Seals: NBR (code M); FKM (code V) available on request (HETG compatible with NBR & FKM; HEPG, HEES only compatible with FKM seals)
Fluid Temperature Range: –20 to +70 °C
Viscosity Range: 15 to 380 mm²/s
Installation Position: Optional
Fluid Cleanliness: ISO 4406 (c) class 20/18/15, recommended filter retention rate β10 ≥ 75
Origin: Made in Germany
Rexroth ZDC Series Weight/Size Comparison
| Size | Approx. Weight (kg) |
|---|---|
| 10 | 3.0 |
| 16 | 3.5 |
| 25 | 8.9 |
| 32 | 64.7 |
Rexroth ZDC Series Technical Documentation
Rexroth ZDC Series Applications
As a dedicated meter-in pressure compensator for proportional directional valve circuits, the ZDC series delivers load-independent flow control for stationary industrial hydraulic systems.
- Machine Tool Hydraulics – Works with proportional directional valves in feed and spindle drive circuits, providing stable speed regulation regardless of cutting load variations.
- Metal Forming & Press Equipment – Ensures consistent actuator speed during stamping and deep-drawing processes, compensating for load changes throughout the working stroke.
- Material Test Rigs & Calibration Systems – Stable pressure compensation characteristics support precise flow output for test bench hydraulic systems, meeting strict curve accuracy requirements.
- Industrial Hydraulic Power Units – Sandwich plate design simplifies valve manifold assembly, reducing circuit complexity for standard modular power units.
- Metallurgical Auxiliary Hydraulics – Rated for 350 bar continuous operation, adapting to high-pressure cyclic load conditions in rolling mill and continuous casting auxiliary circuits.
Commonly Requested Material Numbers (MNR)
Below are frequently ordered ZDC models. If your part number is not listed, please contact us freely.
ZDC 10 Series (Size 10, 2X series)
R900333131 ZDC10P-2X/V
R900488820 ZDC10P-2X/XM
R900371646 ZDC10P-2X/XV
R900572247 ZDC10P-2X/XLM
R900565236 ZDC10P-2X/XLV
R900340757 ZDC10PT-2X/XM
R900948651 ZDC10PT-2X/XLM
ZDC 16 Series (Size 16, 2X series)
R900489670 ZDC16P-2X/V
R900489669 ZDC16P-2X/XM
R900489671 ZDC16P-2X/XV
R900336562 ZDC16PT-2X/M
R900341073 ZDC16PT-2X/XM
R900319500 ZDC16P.-2X/M
ZDC 25 Series (Size 25, 2X series)
R900340362 ZDC25P-2X/V
R900489027 ZDC25P-2X/XM
R900489028 ZDC25P-2X/XV
R900348353 ZDC25PT-2X/M
R900355434 ZDC25PT-2X/XM
R900382170 ZDC25P-2X/XJ3M
R900382205 ZDC25P-2X/J3M
R900319508 ZDC25P.2X/M
R900319509 ZDC25..2X/V
ZDC 32 Series (Size 32, 2X series)
R900437430 ZDC32P-2X/V
R900352039 ZDC32P-2X/XM
R900586948 ZDC32P-2X/XV