Foot Valves to Pilot-Operated NRVs: All Types of Non-Return Valves with Applications & Cost



Non-return valves (NRVs), also known as check valves, are essential for preventing reverse flow in fluid systems. From agriculture to high-pressure Udyog applications, they protect pumps and pipelines. This detailed guide outlines all NRV types, their functions, pricing, and where they're best suited across industrial, agricultural, and commercial sectors.

Types of Non-Return Valves (NRVs)

1. Foot Valve

  • Installed at the suction end of pumps.
  • Contains a mesh strainer to prevent debris.
  • Used in agricultural borewells and water supply lines.

Price Range: ₹120 – ₹800 (1" to 4")

2. Swing Check Valve

  • Disc swings open/closed based on fluid flow.
  • Best for low-pressure water systems.
  • Widely used in building plumbing and irrigation lines.

Price Range: ₹150 – ₹1,200

3. Wafer Type NRV

  • Compact and lightweight design.
  • Sandwiched between pipe flanges.
  • Used in HVAC, air lines, and compact industrial pipelines.

Price Range: ₹300 – ₹2,500

4. Dual Plate NRV

  • Two spring-loaded plates for quick shut-off.
  • Minimizes water hammer effects.
  • Common in Udhhyog systems like process cooling.

Price Range: ₹400 – ₹2,800

5. Lift Check Valve

  • Valve disc lifts when upstream pressure exceeds cracking pressure.
  • Designed for vertical applications.
  • Found in power plants and boiler systems.

Price Range: ₹180 – ₹1,400

6. Ball Type NRV

  • Ball mechanism blocks backflow.
  • Excellent for slurry, sewage, and wastewater.
  • Also used in chemical Udyog pipelines.

Price Range: ₹220 – ₹1,800

7. Spring-Loaded Check Valve

  • Fast-acting spring closure system.
  • Suitable for high-pressure lines and compressors.
  • Used in compressed air systems and hydraulic return lines.

Price Range: ₹250 – ₹1,500

8. Pilot-Operated NRV

  • Operates via external pilot line pressure.
  • Ensures precision control in sensitive systems.
  • Common in refineries, petrochemical Udhhyog, and gas networks.

Price Range: ₹1,500 – ₹10,000

Application Table

Valve TypeApplicationIdeal FluidOrientation
Foot ValveWater pumps, agricultureClean WaterVertical
Swing ValvePlumbing, building pipingWaterHorizontal
Wafer ValveCompact industrial systemsGas, WaterHorizontal
Dual PlateHVAC, Udyog water systemsWater, AirHorizontal
Lift ValvePower plantsSteam, WaterVertical
Ball ValveWastewater, slurry linesSludge, WasteAny
Spring ValveAir compressors, hydraulicsAir, OilAny
Pilot-Operated NRVOil & gas pipelinesGas, OilAny

Features to Consider

  • Cracking pressure – Minimum pressure needed to open the valve
  • Flow direction indicator – Marked for installation guidance
  • Material – Brass, bronze, cast iron, stainless steel, PVC
  • Size range – Available from ½" to 6" and above
  • Mounting type – Threaded, flanged, welded

FAQ 

What is the price of a 1-inch foot valve?

₹120 to ₹300 based on material (PVC, brass, cast iron) and local supplier.

Which NRV is best for slurry pipelines?

Ball-type NRVs are best due to their minimal clogging and easy operation.

What’s the difference between a check valve and NRV?

Technically similar, NRV is the Indian industry term for check valve. Both allow one-way flow.

Can I use a swing NRV for vertical piping?

No. Swing check valves are not suitable for vertical flow; lift NRVs are preferred.

What is cracking pressure in NRVs?

Cracking pressure is the minimum upstream pressure required to open the valve.

Where is a pilot-operated NRV used?

In high-risk Udyog applications like oil refineries and natural gas lines requiring precision.

 

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