Slip-on Duckbill Check Valve
Professional-grade backflow prevention with patented design. Trusted by industry leaders across 46+ countries for superior performance in demanding applications.
Why Choose Our Slip-on Duckbill Valves?
As China's pioneer in duckbill valve technology, we deliver unmatched reliability and performance for critical applications.
100% Backflow Prevention
Patented duckbill design ensures complete seal against reverse flow, protecting your system integrity.
Low Cracking Pressure
Opens at minimal pressure differential, ensuring efficient flow with reduced energy consumption.
Self-Cleaning Design
Non-clogging operation with automatic debris clearing, minimizing maintenance requirements.
Patented Technology
Proprietary R&D patents with continuous innovation since 1989, ensuring cutting-edge performance.
Custom Manufacturing
Molded type for small diameters, spool type for large diameters up to DN3000 with custom configurations.
Global Compliance
ISO9001, CE, EAC certified with multiple flange standards: ANSI, AS, BS, JIS for worldwide compatibility.
Technical Specifications
Engineered for demanding industrial applications with superior materials and precision manufacturing.
Product Specifications
Material Options
Rubber Materials
- • EPDM (Standard)
- • Neoprene Rubber
- • Nitrile Rubber (NBR)
- • Natural Rubber (NR)
Clamp Materials
- • SS316 (Marine Grade)
- • SS304 (Standard)
- • Carbon Steel
- • Custom Alloys
Manufacturing Excellence
Small Diameter (DN50-DN600)
Precision molded type manufacturing ensures consistent wall thickness and optimal performance characteristics.
Large Diameter (DN700-DN3000)
Hand-wrapped spool type construction allows for custom configurations and maximum size flexibility.
Quality Assurance
Every valve undergoes rigorous testing including pressure, flow, and backflow prevention verification.
Installation Guide & Best Practices
Professional installation ensures optimal performance and longevity of your duckbill valve system.
Step-by-Step Installation
Pre-Installation Inspection
Verify pipe diameter, check valve size compatibility, and inspect all components for damage. Ensure proper valve orientation marking.
Pipe Preparation
Clean pipe end thoroughly, remove burrs and sharp edges. Ensure pipe end is cut square and smooth for proper seal.
Valve Positioning
Slide duckbill valve over pipe end with bill opening facing downstream flow direction. Maintain specified extension length.
Clamp Installation
Position stainless steel clamp over valve mounting area. Tighten bolts evenly in cross pattern to specified torque values.
System Testing
Perform flow test to verify proper opening and backflow test to confirm complete seal. Check for leaks and proper operation.
Critical Installation Notes
Safety & Compliance
- • Always verify flow direction before installation
- • Use proper PPE during installation procedures
- • Follow local codes and regulations
- • Ensure system is depressurized before work
Performance Optimization
- • Maintain minimum 3D straight pipe upstream
- • Avoid sharp bends immediately downstream
- • Consider submersion depth for outfall applications
- • Account for tidal variations in marine installations
Maintenance Schedule
- • Visual inspection every 6 months
- • Functional testing annually
- • Clamp torque verification as needed
- • Replace valve every 10-15 years or as required
Need Installation Support?
Our technical team provides comprehensive installation guidance, custom drawings, and on-site support for complex projects.
Industrial Applications
Trusted across diverse industries for critical backflow prevention and system protection.
Wastewater Treatment
Outfall protection and effluent discharge systems
Marine & Coastal
Seawater intake and tidal protection systems
Power Plants
Cooling tower and thermal discharge applications
Stormwater
Flood control and drainage management
Ready to Upgrade Your System?
Join 46+ countries trusting GYLDT's patented duckbill valve technology. Get your custom quotation today with technical specifications tailored to your project requirements.