HD – DA/DAW Pilot Operated Shut-off – Pressure valves
Maximize your hydraulic system's energy efficiency and ensure absolute pressure control with the HD DA/DAW Series Pilot Operated Shut-Off Valves. Available through Thm Hydraulics, these premium pressure valves are specifically engineered to automatically unload your hydraulic pump to the tank when the set system pressure is reached, drastically reducing heat generation and power consumption. Designed for heavy-duty industrial applications, the series comfortably handles operating pressures up to 315 bar. Whether you require standard mechanical shut-off (DA) or electrically triggered unloading via a built-on solenoid directional valve (DAW), this series provides the precise, customizable pressure management your accumulators and high-flow circuits demand.
Core Technical Specifications:-
- Component Architecture: Pilot Operated Shut-Off Pressure Valve (Unloading Valve)
- Model Type: HD-DA (Mechanical) / HD-DAW (Solenoid Actuated)
- Maximum Operating Pressure: Up to 315 bar
- Pressure Ratings: 4 distinct optional pressure ratings available
- Mounting Style: Subplate Mounting
Key Features & Engineering Advantages:-
- Solenoid Actuated Unloading (DAW Model): Features a built-on directional control valve that allows operators or PLCs to electrically trigger the unloading of the system pressure. This is critical for emergency stops, safe machine start-ups, and complex automated cycling.
- 4 Versatile Adjustment Elements: Tailor the valve perfectly to your operational security needs. Choose from a standard Rotary Knob, a tamper-resistant Sleeve with Internal Hexagon and Protective Cap, a highly precise Rotary Knob with Scale, or a secure Lockable Rotary Knob with Scale to prevent unauthorized pressure changes.
- Optimized Accumulator Charging: Acts as the perfect accumulator charging valve. It directs pump flow into the accumulator until the exact maximum pressure is reached, then seamlessly bypasses the pump flow back to the tank at near-zero pressure, saving massive amounts of energy.
- Tailored Pressure Ratings: With 4 optional pressure ratings, engineers can select a valve that perfectly matches the sensitivity and operating window of their specific hydraulic schematic.
- Leak-Free Subplate Integration: Designed exclusively for subplate mounting, ensuring a robust, clean, and highly organized integration onto standard manifold blocks without complex external piping.
Ideal Industry Applications:-
The energy-saving unloading function and 315 bar endurance make the HD DA/DAW Series the premier choice for:
- Hydraulic Power Units (HPUs): Serving as the primary energy-saving control valve in power packs equipped with accumulator systems.
- High-Tonnage Industrial Presses: Safely managing the intense pressure build-up and rapid electrical unloading required during metal forging and stamping cycles.
- Plastics & Injection Molding: Maintaining precise holding pressures during the cooling phase while allowing the main pump to idle efficiently.
- Automated Machine Tooling: Providing exact, secure pressure regulation for CNC clamping fixtures with the ability to electronically dump pressure for fast tool changes.
Why Choose the HD DA/DAW Series?
- Slash Your Energy Costs: By automatically unloading the pump when pressure is met, you eliminate wasted energy, reduce fluid temperatures, and extend the lifespan of your entire hydraulic system.
- Total Calibration Security: The lockable and hex-sleeve adjustment options guarantee that once your critical system pressure is dialed in, it cannot be accidentally bumped or intentionally altered by unauthorized personnel.
- Instant Electrical Control: The DAW's built-in solenoid valve gives your PLC total command over the hydraulic circuit's pressurized state, bridging the gap between mechanical fluid power and digital automation.
