A hydraulic electric control valve is a specialized valve used in hydraulic systems (such as water supply, drainage, irrigation, and hydropower stations) to automatically regulate and control parameters such as flow rate, pressure, and level of fluids (water or a mixture of water and solid particles). It automatically adjusts the valve opening by sensing changes in system parameters to maintain stable system operation, making it a key piece of equipment in the construction and operation of hydraulic engineering projects.
Core Control Functions
1. Flow Regulation and Control
Precise Flow Regulation: By using electric actuators (such as motors or servo mechanisms) to drive valves to open, close, or change their opening degree, the flow rate of fluid in the pipeline is adjusted in real time to meet the precise flow requirements of the system (e.g., water-saving irrigation, material proportioning in industrial processes).
Dynamic Flow Balancing: In multi-branch pipeline networks, in conjunction with sensors and control systems, the flow rate of each branch is automatically balanced to avoid uneven flow caused by pressure fluctuations (e.g., central air conditioning water systems, building water supply and drainage systems).
2. Pressure Stabilization and Control
Pressure Reduction and Stabilization: When used as a pressure reducing valve, it can reduce the upstream high-pressure fluid to the required stable pressure downstream (e.g., pressure-reducing water supply in high-rise buildings in urban water supply systems).
Pressure Relief Protection: When the system pressure exceeds a set threshold, it automatically opens to relieve pressure (e.g., overload protection in hydraulic systems, overpressure release in fire-fighting pipelines).
Back Pressure Maintenance: Maintains stable downstream pressure in a closed-loop system to ensure the normal operation of equipment (e.g., water pumps, filters).
3. Water Level Control
Automatic Water Level Adjustment in Water Tanks/Pools: Through linkage with level sensors, valves automatically open or close when the water level reaches a set value, automating water storage or drainage (e.g., sedimentation tanks in sewage treatment plants, water replenishment control in building water tanks).
Prevention of Overflow or Drying Out: Avoiding abnormal water levels due to human oversight, improving system safety (e.g., water storage tanks and fire-fighting water tanks in water conservancy projects).
Automation and Linkage Control
1. Combination of Remote and Local Control
Remote Operation: Connecting to intelligent control systems (e.g., PLC, DCS, IoT platforms), remotely adjusting valve opening or on/off status via electrical signals, suitable for unattended scenarios (e.g., smart water systems, industrial automated production lines).
Local Manual Control: Equipped with manual operating devices (e.g., handwheels, handles), enabling emergency operation in case of power outages or system failures, improving reliability.
2. Multi-System Interlocking Response
Fire Alarm Interlocking: When the fire alarm system is triggered, the fire sprinkler or fire hydrant valves automatically open, quickly initiating the fire extinguishing process (compliant with fire protection standards such as GB 50974).
Pump Start/Stop Interlocking: In conjunction with the pump control cabinet, valves open/close before the pumps to avoid water hammer (sudden pressure changes in the pipeline), protecting pipelines and equipment.
Energy Saving Interlocking: In HVAC systems, the chilled water/hot water flow rate is automatically adjusted based on room temperature sensor signals to reduce energy consumption (e.g., energy-saving control of variable flow water systems).
Safety Protection and System Optimization
1. Prevention of Water Hammer and Impact
Through the slow-opening and slow-closing function of the electric actuator (e.g., setting opening and closing times), sudden changes in fluid velocity within the pipeline are reduced, preventing water hammer damage to pipelines and valves (common in water supply and drainage, and heating networks).
2. Fault Protection and Alarm
Built-in limit switches, torque sensors, etc., detect abnormal states such as valve jamming, overload, and power failure, promptly sending alarm signals and stopping operation to prevent the accident from escalating. 3. System Energy Saving and Efficiency Improvement
In water supply systems, flow rate is dynamically adjusted based on real-time water demand, avoiding the crude "fully open/fully closed" control of traditional valves and reducing pump energy consumption (e.g., the combined application of variable frequency pumps and electrically controlled valves).
In industrial processes, precise control of fluid parameters improves production efficiency and product quality (e.g., material injection control in chemical reactors).
Typical Application Scenarios
Urban Water Supply and Drainage: Pipeline pressure regulation, pump station inlet and outlet control, and sewage treatment plant level management.
Fire Protection Systems: Electrical control of deluge valves and wet alarm valves ensures rapid response in case of fire.
HVAC: Electrically operated two-way and three-way valves at air conditioning terminals regulate chilled water flow to achieve room temperature control.
Industrial Processes: Automated control of corrosive or high-temperature fluids in the chemical, petroleum, and power industries.
Water Conservancy Projects: Remote electrically controlled reservoir gates and irrigation systems improve water resource utilization efficiency.