Everything About NRV (Non-Return Valves): Types, Checkmate, Swing, Wafer & Price List

 Non-return valves (NRVs), also known as check valves, are vital in preventing backflow in pipelines. This guide explores every major NRV valve type including swing, wafer, checkmate, and pilot-operated valves. Designed for Udhhyog applications, it also covers prices, use cases, and industrial relevance.

What is an NRV Valve?

• Allows flow in one direction only

• Prevents damage from reverse flow

• Common in water, gas, and oil systems

Checkmate vs NRV vs Check Valve

Feature	Checkmate Valve	NRV (Non-Return Valve)	Check Valve
Function	Prevents backflow	Prevents reverse flow	Same as NRV
Control	Passive	Passive or assisted	Passive
Build Type	Compact, lightweight	Varies by type	Industrial grade
Udyog Use	Water tanks, pumps	All fluid systems	Oil & gas, water plants

Top NRV Types with Price Range

1. Swing NRV

• Hinged disc swings open/close with flow.

• Ideal for gravity-fed pipelines. Price: ₹150 – ₹1,200

2. Wafer NRV

• Compact design fits between flanges.

• Used in HVAC and Udhhyog systems. Price: ₹300 – ₹2,500

3. Foot Valve

• Placed at pump suction end.

• Has strainer to block debris. Price: ₹120 – ₹800

4. Dual Plate NRV

• Twin spring-loaded plates for faster action.

• Reduces water hammer. Price: ₹400 – ₹2,800

5. Lift Type NRV

• Valve disc lifts vertically on flow pressure.

• Common in vertical installations. Price: ₹180 – ₹1,400

6. Ball NRV

• Ball inside chamber rolls to seal flow.

• Perfect for wastewater and slurry. Price: ₹220 – ₹1,800

7. Spring-Loaded Check Valve

• Internal spring closes valve quickly.

• Best for air lines and compressors. Price: ₹250 – ₹1,500

8. Pilot-Operated NRV

• Controlled by external pilot pressure.

• Used in high-pressure industrial Udyog setups. Price: ₹1,500 – ₹10,000

Application Table

Valve Type	Application	Ideal Fluid	Orientation
Foot Valve	Water pumps, irrigation	Clean Water	Vertical
Swing Valve	Building plumbing	Water	Horizontal
Wafer Valve	Compact industrial systems	Gas, Water	Horizontal
Dual Plate	HVAC, Udyog process lines	Water, Air	Horizontal
Lift Valve	Power plants, boilers	Steam, Water	Vertical
Pilot-Operated NRV	Oil & gas pipelines	Gas, Oil	Any

Key Features to Consider

• Cracking pressure rating

• Body material (CI, SS, Bronze, Brass)

• End connection (flanged, threaded)

• Flow direction marking

• Pressure & temperature rating

Udyog Use Cases

• Chemical plants: Lift and pilot NRVs for fluid control

• Water treatment units: Swing and foot valves

• Petrochemical Udyog: Pilot-operated valves for precision

• Agricultural Pumps: Ball and foot valves

FAQ Section

Q1. What is a checkmate valve?

A checkmate valve is a compact, backflow prevention valve typically used in drainage or low-pressure systems like rainwater tanks.

Q2. Are wafer NRVs better than swing NRVs?

Wafer NRVs are more compact and lightweight, making them ideal for tight spaces, whereas swing NRVs are better suited for basic plumbing systems.

Q3. What’s the price of a 2-inch dual plate NRV?

Prices typically range from ₹700 to ₹1,800 based on material and pressure rating.

Q4. Which NRV is best for Udyog use?

Pilot-operated and dual plate NRVs are preferred in Udyog due to high efficiency and durability under industrial conditions.