How to Use a Puddle Flange in RCC Slab Construction – Step-by-Step Guide

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  A puddle flange is a simple yet essential fitting used in civil construction to prevent water leakage where pipes pass through concrete structures. In RCC (Reinforced Cement Concrete) slabs, these flanges act as a seal that stops water from migrating along the outer surface of a pipe. Whether you are working on water tanks, basements, lift pits, or underground pipelines, installing a puddle flange correctly ensures waterproofing and structural durability. This step-by-step guide from Udhhyog , a leading supplier of GI, MS, and SS puddle flanges in India, explains how to use a puddle flange during RCC slab construction. 🧰 Step-by-Step Guide ✅ Step 1: Choose the Right Puddle Flange Select a puddle flange based on the pipe size and material (MS, GI, or SS). GI puddle flanges are ideal for general drainage and water pipes. Use stainless steel for corrosive environments or coastal zones. At Udhhyog , we provide puddle flanges in custom sizes with...
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Wafer Type NRV Valve: Design, Function, and Applications

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Wafer Type NRV Valve: Design, Function, and Applications

 Wafer type NRV (Non-Return Valve) is a compact, lightweight valve designed to prevent backflow in pipelines. It is widely used in Udhhyog industries due to its easy installation between flanges, fast response, and low-pressure drop.

What is a Wafer Type NRV Valve?

A wafer type NRV valve is a non-return valve with a thin, disk-shaped body designed to fit snugly between two pipe flanges. It operates by allowing flow in one direction and automatically preventing reverse flow, ensuring pipeline safety and efficiency.

✅ Key Features:

  • Slim profile for tight installations

  • Quick closing mechanism

  • Available in stainless steel, cast iron, bronze

  • Minimal head loss

  • Spring-loaded disc mechanism

πŸ”§ H2: Design of Wafer Type NRV Valve

πŸ”Ή Components:

  1. Body – Thin, disc-shaped

  2. Disc – Moves with flow direction

  3. Spring – Assists in closing the disc

  4. Seals/Gaskets – Prevents leakage

πŸ”Ή Materials Used:

ComponentMaterial Options
BodySS304, Cast Iron, Bronze
DiscSS316, Alloy Steel
SpringSS304/316
SealEPDM, Nitrile, PTFE

How Wafer Type NRV Valve Works

Simple Working Principle:

  • Forward flow: Pressure pushes disc open.

  • No flow: Spring starts closing the disc.

  • Reverse flow: Disc snaps shut to block backflow.

Flow Direction:

  • Designed for one-way flow.

  • Works best in horizontal pipelines.

🏠 H2: Applications in Udyog Industries

πŸ”Ή Common Industrial Uses:

  • Water supply and treatment plants

  • HVAC systems

  • Food & Beverage processing

  • Pharmaceutical piping

  • Oil & gas refineries

🌍 Udyog Sector Applications:

IndustryUse Case
Chemical PlantsPrevent chemical backflow
Manufacturing UnitsCooling and heating systems
Power GenerationSteam and feedwater systems
Process AutomationFluid direction control

Benefits of Using Wafer Type NRV in Udyog

  • ✅ Easy to install in tight spaces

  • ✅ Reduces maintenance downtime

  • ✅ Increases system reliability

  • ✅ Compatible with various media

  • ✅ Lower operational cost

πŸ”„ H2: Wafer Type NRV vs Other NRV Types

FeatureWafer TypeSwing TypeLift Type
InstallationCompact, flange-fitRequires extra roomVertical piping
Response SpeedFastModerateFast
Cost EfficiencyHighModerateLow
MaintenanceLowModerateModerate

 How to Choose the Right Wafer Type NRV

✅ Key Considerations:

  1. Pipe Size & Pressure Rating

  2. Flow Media (Liquid/Gas/Chemical)

  3. Installation Space Available

  4. Material Compatibility

  5. Local Udyog requirements

🚢 H2: Real Udyog Case Studies

πŸ”Ή Faridabad HVAC Plant

Installed SS wafer NRVs in cooling lines for energy savings.

πŸ”Ή Ludhiana Chemical Unit

Used PTFE-seal NRVs to prevent acid backflow.

FAQs

πŸ”Έ What is the advantage of wafer-type NRV over swing-type?

A: Wafer NRVs are compact, offer quick response, and are easier to install in tight spaces.

πŸ”Έ Can wafer NRVs be used in vertical pipelines?

A: Yes, but they perform best in horizontal installations with a spring-loaded disc.

πŸ”Έ Are wafer check valves good for chemical applications?

A: Yes, especially when made with corrosion-resistant materials like PTFE, SS316.

πŸ”Έ What pressure rating do wafer NRVs support?

A: Commonly available in PN10, PN16, and higher ratings depending on material.

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