NRV Valve Types Explained: Swing, Wafer, Foot, Dual Plate & Pilot Operated Non-Return Valves


 

Non-return valves (NRVs) are essential for maintaining unidirectional flow in industrial pipelines. Whether used in Udyog sectors like manufacturing, oil & gas, or water treatment, understanding the variety—swing, foot, wafer, dual plate, and pilot-operated—is crucial. This guide covers every type with prices, usage, and buying tips.

NRV vs Check Valve: A Quick Look

FeatureNRV (Non-Return Valve)Check Valve
FunctionPrevents reverse flowSame as NRV
ApplicationUdyog, commercial, domesticMostly industrial
Control TypePassive or pilot-operatedMostly passive
Design VariantsFoot, swing, dual plateSwing, ball, spring


Major Types of NRV Valves

1. Foot Valve

  • Prevents backflow at pump suction.

  • Contains a strainer to block debris.

  • Common in irrigation, borewells.

Price Range: ₹120 – ₹800 (1"–4")

2. Swing NRV

  • Hinged disc swings open with flow.

  • Best for horizontal water lines.

  • Economical and easy to maintain.

Price Range: ₹150 – ₹1,200

3. Wafer Type NRV

  • Thin body, fits between pipeline flanges.

  • Space-saving design for compact systems.

  • Ideal in HVAC and Udhhyog facilities.

Price Range: ₹300 – ₹2,500

4. Dual Plate NRV

  • Twin spring-loaded plates close quickly.

  • Reduces pressure surges.

  • Used in water, chemical, and air lines.

Price Range: ₹400 – ₹2,800

5. Lift Check Valve

  • Opens when pressure exceeds cracking point.

  • Suitable for vertical pipelines.

Price Range: ₹180 – ₹1,400

6. Ball NRV

  • A ball rolls inside to block reverse flow.

  • Used in slurry, sewage, and dirty water.

Price Range: ₹220 – ₹1,800

7. Spring-Loaded NRV

  • Fast response via internal spring.

  • Ideal for compressors and pressurized air.

Price Range: ₹250 – ₹1,500

8. Pilot-Operated NRV

  • Controlled by external pilot flow.

  • Handles high pressure and critical flows.

  • Common in refineries and heavy Udyog lines.

Price Range: ₹1,500 – ₹10,000

Applications by Sector

IndustryValve TypeWhy?
AgricultureFoot, Ball NRVPrevent clogging, suction support
Oil & GasPilot-OperatedReliable under pressure, precise flow
HVAC SystemsDual Plate, WaferSpace-saving, backflow protection
Manufacturing UdyogLift, SwingAir/water control, efficient flow
Power PlantsLift, WaferHigh-temperature & steam resistance

Features to Check Before Buying

  • Size range: ½” to 8”

  • Mounting: Flanged, threaded, or socket

  • Material: Cast iron, brass, SS, bronze

  • Pressure rating (bar/psi)

  • Cracking pressure and flow direction

What is an NRV valve?

An NRV (Non-Return Valve) allows fluid flow in only one direction and blocks reverse flow. It’s used widely in industrial systems to protect pumps and pipelines.

Which NRV is used in agriculture?

Foot valves and ball NRVs are preferred in irrigation and water pumping due to their anti-clogging design.

What is the difference between check valve and NRV?

Both prevent reverse flow. However, “check valve” is a general term, while NRV often refers to a broader category with variants like pilot-operated types.

Which NRV is best for Udyog?

Dual plate and pilot-operated NRVs are best suited for Udyog due to durability, quick action, and resistance to pressure spikes.

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