Non-Return (NRV) and Check Valve Types: Complete Breakdown with Uses & Prices


 

Check valves and non-return valves (NRVs) are essential in ensuring unidirectional flow in fluid systems. These valves prevent backflow, protecting pumps, compressors, and pipelines. Widely used in water supply, industrial Udhhyog setups, and hydraulic systems, their structure varies depending on pressure, media, and function.

Types of Check Valves and NRVs:

  1. Swing Check Valve

    • Opens with flow pressure; swings shut when flow stops

    • Common in water supply, irrigation, and low-pressure systems

    • Price Range: ₹250 – ₹1,000 (1-inch size)

  2. Wafer Check Valve

    • Compact, sandwiched between flanges

    • Ideal for HVAC and industrial Udhhyog systems

    • Price Range: ₹400 – ₹1,500 (1-inch size)

  3. Foot Valve (NRV with Strainer)

    • Installed at suction line of pumps

    • Prevents debris and backflow in water pumping

    • Price Range: ₹300 – ₹1,200

  4. Dual Plate Check Valve

    • Features two spring-loaded plates for tight sealing

    • Suited for Udyog-based power and process industries

    • Price Range: ₹1,000 – ₹5,000

  5. Pilot Operated NRV

    • Controlled via a pilot valve, responsive to pressure

    • Found in refineries and heavy-duty hydraulic systems

    • Price Range: ₹5,000 – ₹15,000

Comparison Table: Check Valve vs NRV Types

Valve TypeFlow DirectionClosure TypeIdeal ForAvg. Price (1-inch)
Swing Check ValveOne-wayHinged DiscWater, irrigation₹250 – ₹1,000
Wafer Check ValveOne-wayThin plateCompact Udyog systems₹400 – ₹1,500
Foot ValveOne-waySpring + StrainerPumps, water tanks₹300 – ₹1,200
Dual Plate CheckOne-wayDual Spring PlatePower, refineries₹1,000 – ₹5,000
Pilot Operated NRVOne-wayPilot-assistedOil, gas, hydraulic Udyog₹5,000 – ₹15,000

Applications in Industrial Udhhyog:

  • Water pumping stations

  • Boiler feed lines

  • Oil refineries

  • Chemical processing

  • Air compressors and hydraulic presses

Selection Tips:

  • Match valve material to fluid (SS for corrosive, MS for general)

  • Use foot valves for pump protection

  • Choose wafer or dual plate valves for space constraints

  • Opt for pilot-operated NRVs for precise control

Price Insights:

  • Bulk orders from Justdial or TradeIndia may reduce cost by 10–20%

  • Stainless steel NRVs are costlier but last longer

  • PVC and brass NRVs are suitable for low-pressure plumbing

FAQs:

What is a non-return valve (NRV)?
A non-return valve allows fluid to flow in one direction only, preventing reverse flow and potential damage.

Is a check valve and NRV the same?
Yes, they are functionally similar. The term "check valve" is common in the U.S., while "NRV" is more used in Udhyog and plumbing in India.

Which type of NRV is best for water pumps?
Foot valves are ideal as they come with strainers to block debris and prevent backflow during pump operation.

How much does a 1-inch check valve cost?
Prices range from ₹250 to ₹1,500 depending on type and material.

Can I use NRV in air systems?
Yes. Wafer and pilot-operated NRVs are preferred in pneumatic and air compressor systems.

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