Dual plate non-return valves are compact check valves designed to prevent reverse flow using two spring-loaded plates. They are ideal for high-flow industrial Udhhyog systems due to their lightweight design, quick response, and minimal pressure drop.
What is a Dual Plate Non-Return Valve?
A dual plate non-return valve (also called a butterfly or split disc NRV) uses two spring-loaded plates that open with forward flow and close against backflow. It is a wafer-type valve designed to fit between flanges and is popular in Udhhyog industries.
๐น Key Features:
Design & Components
๐น Main Parts:
Body: Wafer style, fits between flanges
Plates: Dual half-moon-shaped discs
Spring: Ensures fast shutoff
Shaft & Hinge Pins: Controls plate movement
๐น Common Materials:
| Component | Materials |
|---|
| Body | Cast Iron, SS304, SS316 |
| Plates | Duplex Steel, SS316, Bronze |
| Spring | Stainless Steel |
| Seal | EPDM, NBR, Viton |
Working Principle
๐ How it Works:
Forward Flow: Fluid pushes plates open.
No Flow: Spring starts pushing plates back.
Backflow: Plates snap shut to prevent reverse flow.
✅ Installation Tips:
Applications in Udhhyog Industries
๐น Industrial Use Cases:
Water supply systems
Oil and gas processing
Steam and HVAC networks
Power plants
Firefighting systems
๐ Udhhyog Sector Applications:
| Udyog Sector | Application Area |
| Chemical Manufacturing | Acid & solvent pipeline protection |
| Water Treatment Plants | Preventing pump backflow |
| Food & Beverage | Hygienic fluid flow control |
| Petrochemical Units | Oil and chemical media flow |
Benefits of Dual Plate NRV
✅ Compact and lightweight
✅ Cost-effective vs. swing valves
✅ Lower water hammer effect
✅ Easy to install & maintain
✅ Reduced energy consumption
Dual Plate NRV vs Wafer & Swing Type
| Feature | Dual Plate NRV | Wafer NRV | Swing Check Valve |
| Design | Dual disc | Single disc | Swing disc |
| Response Speed | High | High | Moderate |
| Installation Space | Very Compact | Compact | Requires clearance |
| Water Hammer | Low | Moderate | High |
Choosing the Right Dual Plate NRV
๐น Key Parameters:
Size and pressure class
Flow media type
Operating temperature
Body and disc materials
Spring rating for flow control
Real Use Cases in Udhhyog
๐น Case Study: Bhiwadi Steel Plant
Used dual plate NRVs to regulate condensate return lines in steam systems.
๐น Case Study: Punjab Chemical Unit
Installed EPDM-seal dual plate NRVs to protect reactors from solvent backflow.
FAQs
๐ธ Can dual plate NRVs handle vertical installations?
A: Yes, dual plate NRVs are effective in both vertical and horizontal pipelines, especially when spring-loaded.
๐ธ Are they better than swing check valves?
A: Yes, due to faster response, lower water hammer, and compact size.
๐ธ What sizes are commonly available?
A: Standard sizes range from 2" to 24", with higher custom options available.
๐ธ Are dual plate NRVs suitable for slurry or thick fluids?
A: Not recommended for viscous or slurry fluids as they may hinder plate movement.
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