Non Return Valve (Reflux Valve)
Our Non-Return (Reflux) Valves feature a robust swing disc mechanism to prevent backflow in fluid pipelines. Available with options like external dashpots or bypass arrangements, they are highly suitable for heavy-duty pumping applications.
Introduction
GM Dalui non-return valves, also known as check valves, are designed to allow fluid flow in one direction and prevent backflow, safeguarding pumps, pipelines, and equipment. They automatically close when flow reverses, protecting the system from damage due to backflow or water hammer.
Key Features
- Swing-type disc design with optional rubber lining for bubble-tight closure.
- Optional lever and counter-weight or hydraulic dashpot to control closing speed.
- Removable cover allows inspection and maintenance without removing the valve from line.
- Renewable gunmetal or stainless steel seat rings.
- Designed to handle water containing suspended solids.
Technical Specifications
| Design Feature | Standard Parameters / Range Options |
|---|---|
| Nominal Size Range | Up to 1200 mm |
| Manufacturing Standards | IS 5312 (Part 1 & 2), BS 5153, EN 12334 |
| Material of Construction (MOC) |
|
| Pressure Ratings | 1.0 / 1.6 / 2.0 / 2.5 / Class 150# / 300# / 800# |
| Modes of Operation | Automatic Non-Return (Gravity/Counter-weight) |
| End Connections | Flanged |
| Application Media | Water pumping stations, municipal supply, power plants, sewage treatment. |
Application & Usage of Non Return Valve (Reflux Valve)
Water Supply Grids
Automatically prevents reverse water flow in distribution networks and high rise pumping loops.
Wastewater Treatment
Prevents sewage reverse flow and contamination inside water purification facilities.
Power Generation Plants
Protects feed pumps and cooling lines from thermal or pressure shocks due to backflow.
Types Of Non-Return Valves
Dual Plate Non-Return
Two spring-loaded plates for efficient flow control, durability, and reliable, with bi-directional operation. Its compact design reduces pressure loss.
Swing Check Valve
Hinged disc for reliable flow control they ensure efficient, one-way flow. Commonly used in water and wastewater systems, and pump discharge lines.
Hydraulic Actuated Non-Return
Expertly manages fluid flow within pipelines, providing controlled slow-closing options to mitigate hydraulic shock and water hammer.
Certificates & Inspection
All valves are subjected to rigorous hydrostatic shell and seat pressure testing in accordance with standard codes (e.g., API 598 / IS 14846) prior to delivery.
- Physical dimension and wall-thickness checks
- Hydrostatic seat and shell test validation
- Manufacturer Test Certificate (MTC) and third-party inspection (SGS, TUV, RINA, IRS etc.) available
- Epoxy powder coating inspection (DFT test)
Quality Assurance
GM Dalui & Sons Pvt. Ltd. is an ISO 9001:2015 certified manufacturer. Our commitment to safety, reliable sealing, and long service life is backed by rigorous material inspection, ultrasonic wall thickness checks, and design calculations.
We customize flow control systems to meet specific requirements for municipal waterworks, agricultural pumping wells, chemical distribution loops, and thermal power plant grids.