Water Treatment

This industry relies on solenoid valves to manage the flow of water and various chemicals used in treatment processes. 

These valves, powered by electromagnetic coils, are used in applications such as chemical dosing, backwashing filters, and automated system control. Pneumatic systems are often used in the handling and control of larger valves or gates in the system.

1. Chemical Dosing

Application scenarios:

In the water treatment process, it is necessary to purify the water by adding chemicals such as coagulants, disinfectants (such as sodium hypochlorite), pH adjusters (such as acids/alkalis). The solenoid valve accurately controls the flow of chemicals by receiving signals from the PLC or SCADA system to avoid excessive or insufficient amounts.

Technical advantages:

Fast response: The millisecond switching speed of the solenoid valve can adapt to dynamic water quality changes, especially for scenarios with large flow fluctuations.

Corrosion-resistant design: The valve body material (such as PTFE, 316 stainless steel) can resist strong acids, strong alkalis and oxidizing media, extending the service life.

Integrated solution: Linked with flow meters and pH sensors to achieve closed-loop control and improve dosing accuracy (error <±2%).

2. Backwashing Filters

Application scenarios:

Multi-media filters, activated carbon filters, etc. need to be backwashed regularly to remove trapped impurities. The solenoid valve switches the direction of water flow through timing control and starts the high-pressure recoil process.

Technical advantages:

Multi-channel control: Multi-position solenoid valves can manage water inlet, drainage and recoil waterways at the same time, simplifying the pipeline layout.

Energy-saving design: Low-power coils (such as 24VDC) are combined with pulse control technology to reduce long-term operating costs.

High flow adaptation: Large-diameter solenoid valves (DN50 and above) or pneumatic valves are assisted to meet large flow recoil requirements (such as hundreds of tons per hour).

3. Pneumatic control of large gates and valves (Pneumatic Systems)

Application scenarios:

In sewage treatment plants or water supply networks, pneumatic systems are often used to control large actuators such as butterfly valves and gate valves (such as DN300 and above), adjust the flow of main pipelines or switch process routes.

Technical advantages:

High torque output: Pneumatic actuators can generate thousands of Newton meters of thrust and easily drive heavy valves.

Intrinsically safe: Spark-free design, suitable for flammable and explosive environments (such as biogas treatment units).

Redundant design: Dual cylinder configuration or fault self-locking function to ensure that the system remains safe when the gas/power is off.

4. Full process automated control (Automated System Control)

Smart integration case:

Membrane treatment system: Solenoid valves are combined with pressure sensors to automatically clean ultrafiltration/reverse osmosis membranes to prevent fouling.

Sludge dewatering line: Pneumatic valves control the mud feeding-extrusion-discharging cycle of the plate and frame filter press to improve dewatering efficiency.

Smart water services: Remotely monitor valve status through the Internet of Things (IoT), and predictive maintenance reduces downtime risks.