Smart Insight, Smart Control
Delivering Intelligent Solutions for Water and Industrial Systems
From deep wells to pipelines and wastewater treatment, Norite delivers efficiency, durability, and trust in every drop.
- 5-Year Warranty
- ISO 9001 Certified
- 24/7 Support
Flap valve
Unidirectional Flow Control to Prevent Backflow
The flap valve allows unidirectional water discharge by automatically opening and closing under hydraulic pressure, effectively preventing flooding, tidal intrusion, and sewage backflow.
Automatic Operation Without External Power
Operates automatically under water pressure or gravity without requiring external power or manual intervention, making it ideal for remote or unattended installations.
Corrosion-Resistant Structure for Diverse Media
Constructed from stainless steel, cast iron, or HDPE with optional epoxy or anti-corrosion coatings, the valve is suitable for rainwater, seawater, sewage, and other harsh media.
Excellent Sealing with Flexible Operation
Tight sealing surfaces and rebound closure ensure zero leakage, while a large opening angle allows for smooth discharge and prevents clogging.
Easy Installation and Wide Applicability
Available in flange-mounted or embedded types, flap valves are compatible with various outlets and sluice structures, offering easy installation and minimal maintenance.
Need custom specifications? Our engineers are ready to help.
Call: +86 15090163952 | Email: lisa@noritesolution.com
Proven Results That Drive Your Bottom Line
Real performance data from our Valve installations across critical industries worldwide
100% Pressure Tested
Tested under Class A sealing standard, across 10,000+ units.
20+ Years Lifespan
Proven performance in seawater, wastewater, and high-pressure pipelines.
8,000+ Valves Installed
Including power plants, municipal water systems, and industrial zones.
99.5% On-Time Delivery
Backed by lean production and strict QC.
Certifications & Standards
Technical Specifications
Engineered for optimal performance across a wide range of industrial applications
Model:
Size:
Water and neutral liquids
50-3000mm
Material:
Sealing strips:
Ductile iron，Carbon steel, stainless steel
Rubber /EPDM/NBR
Work pressure:
Temperature:
PN10,PN16,PN25
Certifications:
ISO,CE Approved
- Application Conditions
Urban Drainage Outlets (Backflow Prevention)
Widely used at the outlets of urban drainage systems to prevent backflow from heavy rain, tidal water, or rivers into municipal pipelines.
Discharge Ports of Wastewater Treatment Plants
Installed at the discharge point of wastewater treatment plants to ensure unidirectional outflow and prevent back-contamination of treated water.
Inlet and Outlet Structures of Reservoirs, Rivers, and Lakes
Used in hydraulic structures to control water intake or discharge, ensuring reliable operation and secure water resource management.
Pump Station Outlets and Flood Control Projects
Installed at the outlets of drainage pump stations or flood control facilities to prevent reverse flow during pump downtime, protecting urban areas from flooding.
Port, Wharf, and Seawall Stormwater Discharge Systems
In coastal engineering, flap valves prevent seawater intrusion during high tides, ensuring effective stormwater discharge at ports and seawalls.
- Product Data Sheet
- Product Data Sheet
Testing Process
From raw materials to finished products, NORITE maintains 100% testing coverage, ensuring that every valve and pump you receive is built to last — safe, stable, and globally certified.
Pressure Testing
Each valve undergoes rigorous pressure and hydrostatic testing prior to shipment to verify body strength, sealing integrity, and pressure stability—ensuring zero leakage and long-term reliability in field operation.
Torque and Functional Testing
Confirming operating performance and precision.
Cycle Life Testing
Simulating long-term use under real working conditions.
Coating & Corrosion Resistance Testing
Validating surface protection and durability.
Dimensional & Material Analysis
Using spectrometers and coordinate measuring machines (CMM) for accuracy.
Traceability - Unique product code
Each product leaving our factory is accompanied by a full inspection report and a unique serial number, enabling full traceability and lifetime quality tracking.
Real Project Cases
Proven performance in critical applications worldwide – see our valves in action
Ebaps Vila Velha
- Espirito Santo State, Brazil
Customer/Owner: “Estacǎo de Bombeamento de Áquas Pluviais
- Working conditions/Challenges:
This pumping station is a rainwater drainage pumping station. As part of the city ‘s large-scale drainage/flood control infrastructure, it is equipped with approximately 12 kilometers of closed drainage pipe galleries + 7 kilometers of anti-seepage channels.
- The type of equipment adopted:
We provide three 900QZB-315KW submersible mixed-flow pumps with a diameter of φ1400mm for this project, along with three 2*4.7m automatic rotary screen cleaners, eleven electric gates and five flap valves.
Key indicators:This equipment is installed at the sewage inlet to control the flow direction of sewage and prevent backflow. It is one of the important devices in environmental protection projects.
Get Your Custom Quote
Our technical experts will analyze your requirements and provide a tailored solution with detailed specifications and competitive pricing.