Product Description
Dual-chamber multi-function pump control valve
The dual-chamber multi-function pump control valve is specifically designed to protect pumps and pipeline systems. Installed at the pump outlet, it effectively prevents and eliminates water hammer damage caused by pump start-stop cycles or sudden power failures. Its unique dual-chamber structure and staged closing mechanism ensure rapid response while avoiding pressure surges, while also achieving a full-open state with low flow resistance. It serves as a core component for the safe operation of pumping stations.
Key Features
- Dual Water Hammer Protection
- Main Disc Rapid Closure: In the event of a power failure, the main disc closes instantly (response time <1 second) under gravity, spring force, and water hammer force, blocking reverse flow.
- Auxiliary Disc Slow Closure: Delayed closing (adjustable) gradually releases back-end high pressure, preventing water hammer waves from impacting the pump.
- Intelligent Slow-Opening Control
- During pump startup, the valve's opening speed is regulated via a needle valve (customizable: 0.5-10 seconds), ensuring smooth pressure buildup in the pipeline and preventing startup water hammer.
- High-Efficiency Flow Design
- Extremely low flow resistance in the fully open state, with pressure loss <0.2 bar (@2m/s flow velocity), reducing energy consumption.
- Dual-chamber balanced structure minimizes medium turbulence, extending seal life.
- Wide Compatibility
- Size Range: DN40-DN1200, covering small water supply systems to large industrial pipelines.
- Pressure Ratings: PN10/16/25/40 or ANSI Class 150/300, suitable for high-pressure conditions.
- Material & Seal Options
- Valve Body Materials: QT500-7 (ductile iron), SUS304/316 (stainless steel), SAF2205 (duplex steel), bronze, offering strong corrosion resistance.
- Seal Materials: NBR (oil-resistant), EPDM (high-temperature resistant), HNBR (chemical-resistant), compatible with clean water, seawater, and mildly corrosive liquids.
- Easy Maintenance
- Removable valve cover design allows seal or disc replacement without pipeline disassembly.
Technical Specifications
| Parameter |
Details |
| Size Range |
DN40-DN1200 |
| Pressure Ratings |
PN10/16/25/40 or ANSI Class 150/300 |
| Closing Speed |
Main disc ≤1 sec; Auxiliary disc adjustable (2-15 sec) |
| Full-Open Pressure Loss |
≤0.2 bar (@2m/s flow velocity) |
| Valve Body Materials |
QT500-7, SUS304, SUS316, SAF2205, bronze |
| Seal Materials |
NBR, EPDM, HNBR |
| Connection Type |
Flanged (Standards: EN 1092-2, ANSI, JIS) |
| Applicable Media |
Clean water, seawater, industrial circulating water, oils, and other non-strongly corrosive media |
Working Principle Diagram
- Pump Startup Phase:
- Inlet pressure gradually pushes the main disc open, with needle valve regulating opening speed to prevent sudden pressure spikes.
- Normal Operation Phase:
- Valve fully opens, with dual-chamber design ensuring low flow resistance.
- Pump Stop/Power Failure Phase:
- Main disc closes instantly to block reverse flow; auxiliary disc closes slowly to release residual pressure, eliminating water hammer waves.
Applications
- Municipal Water Pumping Stations: Protects pumps and pipelines from start-stop water hammer damage.
- Industrial Cooling Systems: Prevents pipe bursts caused by pump failures in high-pressure circulating water systems.
- Fire Pump Rooms: Ensures pipeline safety during emergency shutdowns.
- Seawater Desalination Projects: Corrosion-resistant materials suit high-salinity media.
Selection & Installation Guide
- Selection Tips
- Choose materials based on media corrosivity (SAF2205 or bronze recommended for seawater).
- Stainless steel valve bodies are advised for high-pressure conditions (PN25+).
- Installation Notes
- Must be installed horizontally to ensure proper gravity-assisted disc closure.
- A basket filter is recommended at the pump outlet to prevent debris from jamming the disc.
- Needle valve adjustment should align with system pressure tests; slow-closing time is typically set at 2-3 times the pressure wave transmission time.
The N745 valve combines precise mechanical design and material optimization to integrate water hammer protection with high-efficiency flow, significantly enhancing pumping station reliability and energy efficiency.
Company Profile
Packaging & Shipping
FAQ
1. What is your term of payment?
A: 30% advance payment, 70% to be paid before delivery after goods are ready.
2. How about your delivery time?
A: Delivery Lead Time: Standard shipment within 30 days. Exact delivery date will be confirmed based on order quantity and specific requirements.
3. Can you produce products with my own brand?
A: Yes, we can offer OEM services.
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