The hydraulic downward-opening weir gate is used in pipelines, box culverts, or channels. It serves the functions of flushing, preventing backflow, and regulating. The equipment opens downwards, occupying no space above, hence the name downward-opening weir gate.

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Product Features
Compact structure, weir gate opens downward, does not occupy upper installation space, and does not affect the landscape on the ground.
2. Long service life, featuring a anti-locking structure between the gate and guide rail to minimize wear on the sealing surface.
3. The weir gates are primarily made of stainless steel welding, offering excellent resistance to acids, alkalis, and most corrosive chemicals, as well as wastewater and seawater.
4. Electric control device, featuring precise positioning and easy operation, with capabilities for both local and remote control. Sluice gates can be operated on-site or remotely, allowing them to be stopped at any desired height.
5. Easy maintenance and upkeep; in case of leakage after years of use, simply lift the gate and replace the rubber sealing ring on the door frame, saving time and effort with low repair costs.
Lightweight, about 1/3 the weight of a standard gate. Good sealing performance, featuring rubber soft sealing for excellent sealing effect and bidirectional sealing capability.

Early liquid-driven downstream gates were merely channel or river gate structures, with only simple water storage and drainage functions, their technology being simply opening and closing. However, through our company's research, we have found that under certain technical conditions, installing downstream gates along urban river outlets, especially large outlets, can be quite effective in improving black and smelly water bodies, separating rainwater and wastewater, and building sponge cities.

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The hydraulic lower-lifting weir gate is made of stainless steel 304 material, utilizing plates with a thickness of 10mm or more, offering a longer service life than traditional hydraulic gates. Its hydraulic transmission method effectively prevents sticking, which is prone to occur in harsh wastewater environments, and operates more safely and stably than electric gates.
Choose a 380V high-power hydraulic pump, ensuring ample power for the gate's opening and closing; the double-layer steel wire braided high-pressure hose is corrosion and pressure-resistant, equipped with position sensors, pressure switches, and two-way balance valves, accurately reflecting the gate's status, pressure coefficient, and pressure retention effect. SCADA Control System: Utilizing Siemens PLC, Schneider Electric low-voltage electrical components, and other imported electrical elements, equipped with ultrasonic level gauges, level sensors, rainfall sensors, and COD water quality online analyzers, accurately measuring various conditions within the cutoff well and providing the control system with correct parameters for operation. Features a remote module, high-definition camera, allowing real-time monitoring and control of equipment from a computer at any time and place.

Structure and Operating Principle:
The hydraulic lower-lift weir gate system primarily consists of weir gates, hydraulic systems, ultrasonic level gauges, and control systems. To facilitate later maintenance, a maintenance groove is typically provided in front and behind the weir gates.
The downstream weir gate is driven and controlled by an opening and closing hydraulic cylinder to lift or lower the gate plate. The hydraulic cylinder can be equipped with an automatic control system, allowing for unmanned automatic control of the liquid-driven downstream weir gate. Water from the upstream flows over the top of the gate plate. The gate plate can be raised or lowered as needed and can stop at any position to control the flow rate of water distribution or adjust the upstream water level. It can achieve multiple functions such as flushing, water level control, and flow control.
The ultrasonic liquid level sensor detects the water levels on both sides of the weir gate and converts them into electrical signals for the control system. The control system then drives the hydraulic cylinders on both sides of the weir gate, allowing the weir plate to slide up and down within the guide slots. The sides and bottom of the guide slots are equipped with rubber seals for sealing purposes (can be triple or quadruple sealed). The hydraulic cylinders are fitted with position sensors, enabling precise control of the weir plate's stopping position at any point. In the event of a power outage, the system can manage functions such as controlling upstream water levels, flushing, and preventing backflow.

The early liquid-driven downstream sluice gates were merely channel or river gate structures, with only simple water storage and drainage functions, their operation being simply opening and closing. However, through our company's research, we have found that under certain technical conditions, installing downstream sluice gates at urban river outlets, especially large-scale outlets, can have a significant effect on the treatment of black and smelly water bodies, rainwater and sewage separation, and the construction of sponge cities.
The hydraulic bottom-lifting weir gates are made of 304 stainless steel with plates over 10mm thick, offering a longer service life than traditional hydraulic gates. Their hydraulic transmission method effectively prevents sticking in harsh wastewater environments and operates more safely and stably than electric gates.
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