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
Feature | NRV (Non-Return Valve) | Check Valve |
---|---|---|
Function | Prevents reverse flow | Same as NRV |
Usage in Udyog | Widely used in water, oil & gas | Preferred in high-pressure pipelines |
Types | Foot, Swing, Wafer, Pilot Operated | Swing, Ball, Lift, Spring-loaded |
Control | Passive or pilot-assisted | Mostly passive |
Design | Compact to heavy-duty | Mostly 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
Industry | Recommended NRV Type | Reason |
Agriculture | Foot & Ball NRV | Prevents clogging in irrigation |
Manufacturing | Dual Plate, Lift Valve | Controls high-pressure air/water |
Oil & Gas | Pilot-Operated | Handles pressure surges efficiently |
Plumbing | Swing, Wafer NRVs | Simple, cost-effective flow control |
Power Plants | Lift & Swing NRV | Used 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).
Comments
Post a Comment