Complete Guide to Non-Return Valves (NRV): Types, Prices & Differences from Check Valves



 Non-return valves (NRVs) and check valves are essential components in flow systems, especially in industrial Udhhyog settings. This guide explains all major NRV types, their costs, use cases, and key differences from check valves. Learn which valves best fit water pumps, air lines, hydraulic units, and industrial systems.

NRV vs Check Valve: Quick Comparison

FeatureNRV (Non-Return Valve)Check Valve
FunctionPrevents reverse flowSame as NRV
Usage in UdyogWidely used in water, oil & gasPreferred in high-pressure pipelines
TypesFoot, Swing, Wafer, Pilot OperatedSwing, Ball, Lift, Spring-loaded
ControlPassive or pilot-assistedMostly passive
DesignCompact to heavy-dutyMostly robust industrial builds

Top Non-Return Valve Types with Prices

1. Foot Valve

  • Positioned at pump inlets.

  • Includes mesh strainer.

  • Common in water extraction.

Price: ₹120 – ₹800

2. Swing NRV

  • Uses a swinging disc.

  • Suited for gravity flow pipelines.

Price: ₹150 – ₹1,200

3. Wafer Type NRV

  • Lightweight design between flanges.

  • Great for compact systems.

Price: ₹300 – ₹2,500

4. Dual Plate NRV

  • Spring-loaded dual flaps.

  • Reduces water hammer.

Price: ₹400 – ₹2,800

5. Lift Check Valve

  • Operates with flow pressure.

  • Installed in vertical piping.

Price: ₹180 – ₹1,400

6. Ball NRV

  • Uses a rolling ball to control flow.

  • Suitable for slurry or sewage.

Price: ₹220 – ₹1,800

7. Spring-Loaded Check Valve

  • Quick closing via internal spring.

  • Used in air compressor lines.

Price: ₹250 – ₹1,500

8. Pilot-Operated NRV

  • Controlled via external pressure.

  • Ideal for critical Udyog processes.

Price: ₹1,500 – ₹10,000

NRV Applications by Industry

IndustryRecommended NRV TypeReason
AgricultureFoot & Ball NRVPrevents clogging in irrigation
ManufacturingDual Plate, Lift ValveControls high-pressure air/water
Oil & GasPilot-OperatedHandles pressure surges efficiently
PlumbingSwing, Wafer NRVsSimple, cost-effective flow control
Power PlantsLift & Swing NRVUsed in water and steam lines

NRV Features to Consider

  • Flow direction indicator for proper installation

  • Material options like cast iron, stainless steel, brass

  • Pressure rating for your system

  • Installation style: flanged, threaded, socket weld

  • Size range: ½ inch to 8 inches

Udhhyog Use Cases

  • Pump Rooms: Foot valves for suction

  • Cooling Systems: Wafer valves for minimal space

  • Process Piping: Dual plate valves to prevent hammer

  • Oil Pipelines: Pilot-operated NRVs for precision

FAQ 

What is an NRV?

An NRV (Non-Return Valve) is a valve that only allows fluid flow in one direction, preventing reverse flow in pipelines.

Are NRVs and check valves the same?

Yes, in most cases they are. NRV is a broader term, while check valve is commonly used in mechanical systems.

Which valve is best for industrial Udyog use?

Dual plate and pilot-operated NRVs are ideal for industries due to their high-pressure resistance and durability.

What is the cost of a 1-inch NRV?

₹150 to ₹500 depending on the type and material (brass, CI, SS).

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