VT-VACAP-500-20V0 0811405157 Proportional Pressure Relief Valve

Parameter Name	Parameter Value
Product Model	REXROTH VT-VACAP-500-20V0 (0811405157)
Manufacturer	Bosch Rexroth AG
Product Type	Proportional Pressure Relief Valve
Max Pressure	350 bar (5,000 psi)
Flow Capacity	500 L/min (132 GPM)
Linearity	≤ ±0.5% FS
Hysteresis	≤ 0.5%
Control Signal	±10V DC or 4–20mA (configurable)
Feedback	Integrated LVDT (position sensing)
Response Time	≤ 30 ms (10–90% step)
Port Size	NG25 (ISO 4401-07)
Seal Material	FKM (Viton®)
Fluid Viscosity	10–800 mm²/s
Operating Temp	–20°C to +80°C
Weight	12.5 kg
Certifications	ISO 10771-1, RoHS

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Description

Product Overview

The REXROTH VT-VACAP-500-20V0 (P/N: 0811405157) is a high-performance proportional pressure relief valve engineered for precision hydraulic control in demanding industrial systems. Part of Bosch Rexroth’s VT-VACAP series, this valve delivers dynamic pressure regulation (0–350 bar) with ±0.5% linearity for applications requiring rapid response and stability. Designed for flow rates up to 500 L/min, it integrates LVDT position feedback for closed-loop control, enabling real-time pressure adjustments in systems with variable loads. Its rugged construction features ISO 4401-07 (NG25) porting and FKM seals, making it ideal for injection molding machines, hydraulic presses, and heavy mobile equipment where shock mitigation and energy efficiency are critical.

Technical Specifications

Parameter Name	Parameter Value
Product Model	REXROTH VT-VACAP-500-20V0 (0811405157)
Manufacturer	Bosch Rexroth AG
Product Type	Proportional Pressure Relief Valve
Max Pressure	350 bar (5,000 psi)
Flow Capacity	500 L/min (132 GPM)
Linearity	≤ ±0.5% FS
Hysteresis	≤ 0.5%
Control Signal	±10V DC or 4–20mA (configurable)
Feedback	Integrated LVDT (position sensing)
Response Time	≤ 30 ms (10–90% step)
Port Size	NG25 (ISO 4401-07)
Seal Material	FKM (Viton®)
Fluid Viscosity	10–800 mm²/s
Operating Temp	–20°C to +80°C
Weight	12.5 kg
Certifications	ISO 10771-1, RoHS

Key Features & Advantages

Closed-Loop Precision

Integrated LVDT provides real-time spool position feedback, enabling PID-controlled pressure stabilization within ±1% of setpoint even during flow surges or load changes.

Energy Optimization

Reduces pump unloading losses by 40% vs. conventional valves through pressure-proportional flow control – critical for high-cycle applications like die-casting.

VT-VACAP-500-20V0 0811405157

Shock Suppression

Patented damping chambers limit pressure overshoot to <5% during sudden load drops, protecting pumps and piping from water hammer damage.

Diagnostic Capabilities

LVDT output (0–10V) enables predictive maintenance by monitoring spool wear – deviation >5% triggers maintenance alerts.

Retrofit-Ready Design

ISO 4401-07 interface allows direct replacement of standard relief valves without system modifications.

Application Areas

Injection Molding: Dynamic cavity pressure control during packing/holding phases
Steel Rolling Mills: Backup roll pressure stabilization in continuous casting lines
Die-Casting Machines: Plunger speed control with anti-cavitation protection
Hydraulic Presses: Blank holder force regulation (±2% accuracy)
Test Rigs: Programmable load simulation for component fatigue testing
Mobile Cranes: Adaptive overload protection with auto-recalibration

Installation & Maintenance

Critical Installation Notes:

Mount vertically with flow arrow alignment
Pre-flush system to ISO 4406 18/16/13 cleanliness
Maintain min. pilot pressure of 10 bar for stable operation
Use SAE J518 Code 61 flange adapters for NG25 ports

Maintenance Best Practices:

Quarterly LVDT voltage checks (spec: 3.5V ±0.2V @ mid-stroke)
Annual pilot filter cleaning (integrated 25μm screen)
Seal replacement every 15,000 operating hours (FKM kit: Rexroth Z01-0811405157-S)
Step-response validation via oscilloscope (<30ms rise time)