4" Runxin F75A1 Automatic Backwash Valve 10M³/H
4" Runxin F75A1 Automatic Backwash Valve 10M³/H
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Experience effortless high-capacity water treatment with the Runxin F75A1 Automatic Backwash Valve, engineered for superior control, performance, and convenience in large-scale filtration systems.
Designed for 4-inch top-opening FRP vessels, this valve automates the backwash and rinse cycles — efficiently cleaning filter media such as silica sand, activated carbon, glass, Birm, and calcite. With its powerful 10M³/h (10,000L/h) flow rate and advanced digital timer, the F75A1 ensures optimal water quality and extended media lifespan, making it ideal for commercial, industrial, and municipal water treatment systems.
Key Benefits:
• Fully automatic operation with digital timer programming
• High 10M³/h (10,000L/h) flow rate for efficient large-scale backwashing
• Compatible with 4" top-opening FRP filter tanks
• Reduces maintenance time and extends filter media lifespan
• Easy-to-use interface for simplified operation and scheduling
• Durable, corrosion-resistant construction for long-term reliability
Simplify maintenance and maximize performance with the Runxin F75A1 Automatic Backwash Valve — the intelligent choice for high-flow water purification systems.
Product features
Product features
Automatic Backwash Valve for 4" Top-Mount FRP Tanks
High Flow Rate: 10M³/h (10,000L/h)
Programmable Digital Timer Control
2" Female BSP Threaded Ports
Reinforced Engineering Plastic Construction
Supports Sand, Carbon, Glass, Birm & Calcite Media
Fully Automated Backwash & Rinse Cycles
Filtration Details
Filtration Details
Type: Automatic Multiport Backwash Valve
Model: Runxin F75A1
Mount Type: Top Mount (4" Opening)
Flow Rate: 10M³/h (10,000L/h)
Ports: 2" Female BSP (Inlet/Outlet/Drain)
Control Type: Electronic Timer Automation
Media Compatibility: Silica Sand, Activated Carbon, Glass, Birm, Calcite
Cycle Functions: Backwash / Rinse / Service / Bypass
Material: Reinforced Engineering Plastic
Colour: Black
How it Works
How it Works
The Runxin F75A1 automates your filtration system’s backwash process.
At preset intervals, the valve reverses water flow through the filter bed to dislodge and flush out accumulated contaminants.
After rinsing, it automatically returns to normal filtration mode — maintaining consistent system performance without manual intervention.
Installation and Maintanence
Installation and Maintanence
1. Fits standard 4" FRP tank top openings
2. Connect using 2" BSP threaded fittings
3. Program digital timer to set backwash frequency and duration
4. Requires 220V AC power supply for automatic operation
5. Minimal maintenance needed — periodic system inspection recommended
Technical Specifications
Technical Specifications
Model: F75A1
Brand: Runxin
Tank Opening: 4" Top Mount
Flow Rate: 10M³/h (10,000L/h)
Port Size: 2" Female BSP
Power Supply: 220V AC / 50Hz
Control Type: Automatic (Digital Timer)
Working Pressure: 0.15–0.6MPa
Working Temperature: 5°C – 45°C
Drain Port: 2" Female BSP
Material: Engineering Plastic (Corrosion-Resistant)
Warranty Information
Warranty Information
12 Month limited warranty against manufacturing defects.
Excludes damage due to overpressure, electrical surges, or incorrect installation.
Warranty support provided by The Water Filter Factory.
What's in the box
What's in the box
1 × Runxin F75A1 Automatic Backwash Valve
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