Product Overview
Proportional directional spool valves are a type of directional valve. They control the direction of movement and the velocity of individual or multiple hydraulic consumers actuated simultaneously.
Control is independent of the load and continuous. It is possible to operate several actuators simultaneously and independently of each other at different speeds and pressures until the sum of the flows through all actuators reaches the maximum flow rate of the pump output.
The valve platforms follow established load sensing architectures commonly associated with HAWE and Danfoss PVG32 systems.
Key Advantages
- Load-sensitive proportional directional control
- Optimized for mobile machinery
- Energy-efficient system behavior
- Flexible control integration
- Modular sectional structure
- Industry-standard interchangeability
Load-Sensitive Proportional Control Technology
The proportional directional spool valve incorporates load-sensitive (load-sensing) control technology that dynamically adapts flow distribution based on system load conditions. This ensures that actuator movement remains stable and predictable regardless of pressure fluctuations.
In load-sensing hydraulic systems, the valve allows the pump to supply only the pressure and flow required by the highest load, significantly improving system efficiency and thermal behavior. This control principle is especially advantageous in mobile machinery and multi-actuator hydraulic circuits.
Operating and Control Options
- Electro-hydraulic proportional control:
Enables precise electronic signal-based control for automated and intelligent hydraulic systems. - Pilot joystick control:
Compatible with non-detented proportional pilot control joysticks, allowing smooth hydraulic directional control without stepped switching. - Manual actuation:
Provides direct mechanical control for simplified systems or emergency operation. - CAN bus control:
Supports CAN bus communication for centralized valve control, enabling coordinated operation, system diagnostics, and software-based configuration within intelligent hydraulic systems.
Specification
- Flow variants: Size 2, Size3, Size5, Size7, and LSPV32
- Compensation concept: Pre-compensated load sensing design
- Basic operating conditions:
Pilot control pressure ≤ 20 bar
Electrical supply: 12 V DC / 24 V DC
Hydraulic oil cleanliness: NAS 7 or better
Recommended oil viscosity: ISO VG 46
Operating temperature: ≤ 80 °C
Please inform us in advance for low-temperature operation below −20 °C or for alternative oil viscosities.
Applications
- Mobile machinery with load-sensitive hydraulic systems
- Cement plant equipment, including grate coolers
- Heavy-duty industrial hydraulic machinery
- Multi-actuator systems requiring load-independent flow control
Compatibility and Interchangeability
Proportional directional spool valves follow industry-recognized load-sensing design principles and can be integrated into existing load-sensitive hydraulic systems with minimal modification.
The valves are interchangeable with commonly used load-sensing proportional directional spool valves from leading manufacturers, including HAWE Hydraulik SE and Danfoss, enabling efficient replacement, retrofit and system optimization.
Engineering Support & Configuration
The load sensing proportional valve platform can be configured according to application requirements. Engineering support is available for system selection, configuration planning, and OEM integration.
Frequently Asked Questions (FAQ)
Q1:Why is load-sensitive control important in proportional directional valves?
A1: Load-sensitive control allows proportional valves to regulate flow independently of load pressure changes, ensuring stable motion, higher efficiency and better coordination in multi-actuator hydraulic systems.
Q2: Can the valve be controlled by a pilot joystick?
A2: Yes. When combined with a non-detented proportional pilot joystick, the valve provides smooth and continuous hydraulic directional control without step changes.