NRV Check Valve – Flow Control in One Direction Explained
NRV Check Valve – Flow Control in One Direction Explained
An NRV check valve, or Non-Return Valve, is a type of valve used in piping systems to allow flow in one direction and block reverse flow. This ensures fluid or gas flows efficiently without contamination, damage, or system disruption caused by backflow. NRVs are essential in water supply, irrigation, industrial processing, and boiler applications.
How Does an NRV Check Valve Work?
When pressure from the inlet side exceeds that on the outlet, the NRV opens, allowing flow. When the pressure drops or reverses, the valve automatically closes using gravity or a spring mechanism, preventing reverse flow. This function protects pumps, tanks, and pipelines from water hammer, contamination, and pressure surges.
Common Types of NRV Valves
- Lift Type NRV: Used in horizontal pipelines, disc lifts under flow and shuts on reversal.
- Swing Type NRV: Has a swinging disc or flap, ideal for large pipelines with low pressure drop.
- Ball NRV: Uses a solid ball for flow control; works well in viscous or dirty fluids.
- Spring Loaded NRV: Fast-acting and compact; used in vertical pipelines.
- Wafer Type NRV: Thin and lightweight valve fitted between flanges for space-saving systems.
Technical Specifications
| Specification | Details |
|---|---|
| Size Range | 15mm (1/2") to 300mm (12") |
| Pressure Rating | PN10 – PN40 / Class 150 – Class 300 |
| Body Material | CI, SS304, SS316, Brass, MS, Bronze |
| End Connection | Flanged, Screwed, Socket Weld, Wafer |
| Mounting Orientation | Horizontal / Vertical (based on type) |
| Standards | IS 5312, API 594, BS 1868 |
Advantages of Using NRV Check Valves
- Prevents backflow contamination and pressure damage
- Improves pump efficiency and protection
- Minimal maintenance due to simple internal mechanism
- Compact and cost-effective for various industrial needs
- Available in multiple designs for tailored applications
Typical Use Cases
- Water supply systems in residential and commercial buildings
- Pump discharge lines in industrial plants
- Fire fighting piping networks
- Chilled water and HVAC systems
- Boiler feed water and steam lines
- Fuel oil and chemical pipelines
NRV Valve Manufacturers in India
- Udhhyog – Leading supplier of flanged and screwed NRVs. Visit Website | Request Quote
- Sant Valves – Durable valves for high-pressure service
- Kartar Valves – Reliable ISI-certified NRV products
- Zoloto Valves – Extensive range for plumbing and industrial systems
- Hyper Valve – Specialized in stainless steel and high-pressure NRVs
Related Articles
- Lift Type Check Valve – Guide
- Feed Check Valve for Boilers
- Dual Plate Wafer NRV Valves
- Pilot Operated NRV Check Valves
Contact Udhhyog for NRV Valves
Searching for reliable NRV valves for your pipeline system? Udhhyog offers a full range in multiple sizes and MOCs with prompt delivery across India. Get expert support for valve selection and installation needs.
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