VT-VACAP-500-20/V0 0811405157 Proportional Directional valve

Description

Product Introduction: Rexroth VT-VACAP-500-20/V0 Proportional Directional valve

Overview

The Rexroth VT-VACAP-500-20/V0 is a high-performance, modular electro-hydraulic proportional directional control valve produced by Bosch Rexroth. This product belongs to Rexroth’s renowned VT series and is specifically designed for industrial hydraulic systems that require high precision, adjustable flow and direction control. It steplessly controls the flow direction and volume of hydraulic oil by receiving electrical signals, thereby achieving precise and smooth control of the speed and direction of the actuator (such as a hydraulic cylinder or motor).

The “500” in its model usually refers to the nominal diameter of NG10 (based on the ISO 4401 standard), “20” is likely to indicate a design variation or coil type, and “V0” may represent a specific voltage code or option code.

Core functions and working principles

VT-VACAP-500-20/V0 is a pilot-operated proportional directional valve, and its working principle is based on two-stage control:

1. Electrical signal input: The proportional electromagnet on the valve receives an analog current signal from an external amplifier (electronic control unit ECU), such as 0… ±10 V or 4… 20 mA.
2. Pilot stage operation: Changes in the current signal will cause the electromagnet to generate a thrust proportional to the signal, driving the pilot stage valve core to move.
3. Main stage control: The hydraulic oil (pilot oil) controlled by the pilot stage drives the movement of the main stage valve core. The displacement of the main valve core is proportional to the magnitude of the input electrical signal.
4. Flow regulation: The movement of the main valve core alters the opening size and direction of the main oil circuit, thereby continuously regulating the flow and direction of the hydraulic oil leading to the actuator. The polarity (positive/negative) of the input signal determines the direction of the oil flow, and the magnitude of the signal determines the flow rate (speed).

This valve is usually integrated with a position sensor (LVDT) to detect the actual position of the main valve core in real time and form a closed-loop feedback, ensuring extremely high control accuracy and being unaffected by changes in oil viscosity or friction.

Main features and advantages

• Extremely high control accuracy and repeatability accuracy: The built-in valve core position feedback (LVDT) forms a closed-loop control, ensuring the precise correspondence between the valve core position and the input command signal, achieving excellent dynamic response and steady-state accuracy.

• Outstanding energy-saving potential: Compared with traditional on-off valves or servo valves, proportional valves can provide more efficient and smoother control in many operating conditions, reducing energy loss and system heat generation.

VT-VACAP-500-20V0

• Modular design: The VT series adopts a modular design. The valve body, pilot stage, electromagnet and position sensor can be relatively independent. This design is convenient for maintenance, replacement and configuration, reducing the life cycle cost.

• Strong anti-pollution capability: As a proportional valve, its design is more resistant to typical industrial hydraulic oil contamination levels than pure servo valves (such as NG6 Servovalves), enhancing system reliability and service life, and reducing maintenance requirements.

• Compatible with multiple control systems: It can be easily integrated into PLCS, industrial PCS or Rexroth’s own motion controllers through the matching VT-VRPA or VT-SCPA series amplifier modules to achieve complex motion control functions.

• Rich options: Offer a variety of coil voltages, plug forms, spring centering or hydraulic centering options to meet the needs of different application scenarios.

Technical Specifications (Typical Features

• Manufacturer: Bosch Rexroth

• Product Series: VT

• Type: Pilot-operated, electro-hydraulic proportional directional valve (with position feedback

• Nominal diameter: NG10 (based on ISO 4401)

• Rated flow rate: It depends on the type of valve core and pressure difference (for example, at Δp = 35 bar, it can reach ~50-120 L/min. Please refer to the specific data manual for details).

• Maximum working pressure: Usually up to 350 bar (system pressure)

• Pilot fuel supply pressure: An independent pilot fuel supply is required, typically ranging from 25 to 50 bar.

• Electrical interface: It is usually equipped with a plug that complies with the DIN EN 175301-803 standard, and the coil voltage is commonly DC 24V.

• Position sensor: Integrated LVDT (Linear Variable Differential Transformer) for valve core position feedback.

• Oil cleanliness requirements: ISO 4406 19/17/14 or better is usually required. For specific details, please refer to the manual.

Application field

VT-VACAP-500-20/V0 is suitable for all hydraulic control systems that require high precision, speed regulation and reversing, especially:

• Plastic injection molding machine: Control the movement of the injection platform, the speed of the screw and the ejection speed.

• Metal die-casting machine: Precisely control the clamping, ejection and ejection actions.

• Testing equipment: Precise loading control for fatigue testing machines and material testing machines.

• Control of actuators for heavy industrial machinery: such as rolling mills, pipe benders, and presses.

• Machine tool industry: Used for spindle positioning, tool magazine control or feed drive of large machine tools.

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