Electric-Hydraulic Quick-Closing Butterfly Valve System

The electric-hydraulic quick-closing butterfly valve system is an advanced piece of equipment designed specifically for industries such as petrochemicals, metallurgy, and other sectors requiring fast-actuating valves. With increasing demands for automation, safety, and rapid response times, this system has emerged as a critical industrial control device. It integrates a triple-eccentric butterfly valve, hydraulic drive, electrical control system, and associated components, offering efficient fluid control, ensuring precise, reliable, and safe valve operations.

Triple-Eccentric Multi-Layer Metal-Seated Butterfly Valve

The triple-eccentric multi-layer metal-seated butterfly valve is a key component of this system. It builds on the traditional double-eccentric design but adds an angular offset, creating a third eccentricity. This innovation ensures that the valve's sealing surfaces quickly make and break contact during operation, preventing friction and jamming. This greatly extends the lifespan of the sealing surfaces.
Design Advantages: The precise angular offset allows the sealing surfaces to disengage effectively during the opening and closing cycles, reducing wear and improving the sealing effect. The valve maintains reliable sealing performance even under high temperatures, high pressures, and harsh conditions.
Structural Features: Composed of a valve body, butterfly plate, multi-layer sealing rings, valve stem, and supports, the valve uses high-wear, high-temperature resistant materials. Its metal-sealing structure ensures long-term stable operation, making it ideal for the demanding environments of the petrochemical and metallurgy industries.

Drive System

The drive system is crucial for precise valve control and consists of a hydraulic drive mechanism and a mechanical transmission assembly. It uses hydraulic pressure to open and close the butterfly valve, offering fast response times and high control accuracy.
Hydraulic Cylinder: The cylinder and piston inside the hydraulic unit work together. When the hydraulic system supplies pressure, the piston drives the actuator shaft to rotate, which in turn moves the linkage and clevis, opening or closing the butterfly valve.
Mechanical Transmission Components: The system includes the actuator, drive shaft, linkage, clevis, and limit switches. This combination of hydraulic and mechanical transmission ensures smooth, reliable valve movement.
Operating Display: The drive system features an indicator to display the valve's position, allowing operators to monitor the valve's status in real time.

Integrated Hydraulic System

The integrated hydraulic system is a critical part of the overall setup, responsible for supplying the necessary power. It consists of a motor, oil tank, pump, solenoid valve, pressure switch, relief valve, accumulator, and other components, ensuring stability and reliability of the hydraulic system.
Power Supply: The independent, sealed hydraulic power system includes an oil tank, pump, and accumulator. The pump continuously supplies oil to the system to maintain stable pressure, while the solenoid valve precisely regulates oil flow for accurate valve operation.
Hydraulic Control: The accumulator supplies energy for fast closing, while the solenoid valve controls oil pressure to adjust the cylinder's spool valve, enabling the valve to close quickly or open normally.
Throttle Control: A one-way throttle valve regulates the valve's opening speed, allowing users to set speed ranges for smooth valve operation.

Electrical Control System

The electrical control system governs all valve operation commands and provides feedback signals, ensuring automated operation of the system. It includes the control unit, operating components, display, and alarm units, as well as the electrical control box.
Automation Control: The PLC (Programmable Logic Controller) processes all input and output signals, enhancing automation and system maintainability. The control box uses relays to manage the main circuit voltage (AC 380V) and control circuits.
Operational Modes: The system supports automatic, manual, and remote operation modes, allowing users to select the appropriate mode. The PLC sends commands based on remote instructions to control valve functions such as opening, closing, and fast-closing.
Fault Monitoring: The system continuously monitors the valve's operational status, detecting errors such as actuator failure, slow valve operation, or low oil pressure. It triggers alarms to ensure timely maintenance.

Quick-Closing Function and Automatic Fluid Charging

A standout feature of the electric-hydraulic interlocked quick-closing butterfly valve system is its rapid closure capability, which enables the valve to close in a very short time, preventing backflow of steam or liquids and protecting pipeline integrity and equipment safety.
Quick-Closing Action: When the PLC receives a quick-closing signal, the system commands high-pressure oil into the cylinder's rod chamber, rapidly closing the valve. The closure time is less than 0.5 seconds, ensuring swift fluid shutoff to prevent accidents.
Automatic Fluid Charging: The hydraulic system includes an automatic charging function. The oil pump motor starts, sending oil into the accumulator. The charging stops when the accumulator pressure reaches its limit, ensuring normal oil pressure. The system restarts charging when pressure drops, completing the fluid cycle.

Online Activity Testing and Fault Alarms

To ensure long-term stable operation, the system features an online activity testing function. The valve can be tested within a 15% range of full travel, checking for smooth movement and avoiding jamming issues, ensuring safety during extended operation.
Fault Detection and Alarms: The system monitors the valve's working status, detecting and alerting operators to faults such as actuator issues, slow switching times, or low oil pressure, facilitating prompt maintenance.
Status Display: The system uses a display unit to show the valve's operating state, including open, closed, and fast-close modes, providing real-time status updates to operators.

Remote Control and Interlocking Features

To enhance the system's intelligence, the device is equipped with a remote control interface, allowing users to operate the equipment from a remote control room with full functionality similar to the local control box.
Remote Operation: Users can control the valve remotely through functions like remote opening, closing, or fast-closing. The system supports interlocking with pumps or turbines to ensure that the valve can close in a delayed or rapid manner during startup or shutdown to prevent water hammer or other accidents.
Emergency Protection: In the event of a fault or emergency, the quick-closing valve can swiftly shut to protect equipment and pipelines.

Conclusion

The electric-hydraulic interlocked quick-closing butterfly valve system is a vital component in modern industrial control systems. Its integration of hydraulic, electrical, and mechanical technologies provides an efficient, reliable, and safe fluid control solution. With its innovative triple-eccentric sealing design, rapid actuation, automation, and fault monitoring features, it plays a crucial role in industries such as petrochemicals and metallurgy. The system's smart, automated capabilities not only boost production efficiency but also safeguard equipment operation, making it an indispensable device in modern industry.