Non Slam Check Valves – Features & Industrial Applications
Non Slam Check Valves – Features & Industrial Applications
Non slam check valves—also known as silent check valves—are advanced flow control devices designed to eliminate the slamming effect associated with traditional check valves. These valves ensure a smooth and silent closing operation, preventing water hammer and pressure surges in pipelines.
Unlike conventional swing or lift type NRVs that rely solely on gravity or flow reversal to close, non slam valves use spring-assisted or axial flow mechanisms to shut off gradually, minimizing noise and structural vibration. They are commonly used in HVAC systems, water treatment, chemical processing, and pump discharge lines.
What Is a Slam in Valves?
When fluid flow reverses suddenly (e.g., when a pump shuts off), a traditional check valve can slam shut, causing a loud noise and shockwaves known as water hammer. This not only affects system efficiency but also damages pipes, fittings, and pump seals over time.
Key Features of Non Slam Check Valves
- Silent closure with spring-loaded or axial disc design
- Minimizes water hammer and pressure spikes
- Fast response to flow changes
- Compact wafer or inline body design
- Suitable for vertical and horizontal installations
Working Principle
Non slam check valves use a spring or flow-guided mechanism that allows the valve disc to return to its seat gradually as flow decreases. Because closure happens before flow reversal and without gravitational swinging, the process is silent and eliminates the water hammer effect.
Technical Specifications
| Parameter | Specification |
|---|---|
| Size Range | 1" to 24" (DN25 to DN600) |
| Pressure Rating | PN10, PN16, PN25 / Class 150, 300 |
| Body Material | Cast Iron, Ductile Iron, SS304, SS316 |
| Disc Design | Axial Flow / Spring Loaded |
| Connection | Wafer, Flanged, Lug Type |
| Flow Direction | Unidirectional |
| Standard | API 594, BS 1868, IS 5312 |
Applications of Non Slam Check Valves
- Chilled water and condenser systems (HVAC)
- Boiler feed water lines
- Pump discharge lines in municipal water supply
- Firefighting pipeline systems
- Sewage and drainage systems
- Desalination and reverse osmosis plants
Advantages Over Traditional NRVs
- Silent operation with no hammer effect
- Increased system life and reduced maintenance
- Ideal for high-rise building plumbing and long pipe runs
- Compact design reduces installation footprint
Top Manufacturers & Suppliers in India
- Udhhyog – Leading supplier of non slam check valves for HVAC and utility services. Visit Website | Request a Quote
- Kartar Valves – Wafer type non slam valve producer
- Zoloto Valves – Cast iron silent valves
- Kranti Valves – Suitable for water and sewage applications
- Sant Valves – High-end industrial check valve range
Related Articles
- Check Valves in India – Complete Guide
- Pilot Operated NRV Valves
- Dual Plate NRVs
- Wafer Type Check Valve Manufacturers
Contact for Bulk Orders
If you are sourcing non slam check valves for HVAC, water treatment, or process industries, contact Udhhyog for manufacturer-direct pricing and fast delivery across India.
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