nsc

Axial No-slam check valve

Series

NSC and NSZ

Valve design

based on API 6D and customer requirements
based on API 6A and customer requirements

Temperature range
-150 to 662°F (-101 to 350°C)
Size

NPS 2 - 56 (DN 50-1400)
NPS 1.13/16- 21.1/4 (DN 46-540)

 

Pressure rating

ASME 150 - ASME 2500
API 5000-API 15000

Face-to-face
As per API 6D standard/As per API 6A standard
End connections

RF, RTJ as per B16.5 &B16.47
BW, Butt Welded as per B16.25
Hub connection 
6B, 6BX as per API6A

Body design

API 6D: Cast one-piece / cast bolted two pieces for size >20 inch.
API 6A: Forged bolted two pieces

Seat design

Metal-seated with hard facing on disk and seat

Features

Powerful spring for ultra-fast closing action
Venturi pattern design 
Minor friction between moving parts to eliminate any chance of jamming
Spring assisted and short stroke 
No chattering effects to minimize pressure fluctuation during normal conditions
Low pressure drop
High dynamic response and zero reverse flow
Nozzle design if the valve size>20 inch. for better flow regulation
Short pattern design compact face-to-face option for weight and space savings 

Operator

automatic

Testing & certifications

Compliance with API 6D & ISO 5208 & API 598 inspection and testing
Compliance with API 6A inspection and testing 
Fire safe and fire tested as per API 6FA/ 607
PED 2014/68/UE 
Available as per API 6A Standard: 
Different product specification levels (PSL 1, 2, 3, 3G and 4)
Different performance requirement levels (PR1, PR2)
Design validation as per PR2F
 

Velan ABV’s API 6D No-slam check valves are silent in-line and specifically designed to automatically protect critical components from reverse flow as well as pressure transients. Fast and prompt closing is assured due to the powerful spring and short valve stroke. As forward velocity begins to slow, the spring assist starts to close the disc. By the time it reaches zero, the valve disc is closed against the seat before reverse flow can occur, preventing a peak of pressure in the line and water hammer phenomena.
In addition, Velan ABV offers a compact version of No-slam check valves, providing the same reliability and quality of the traditional No-slam valves, but with significant space and weight savings.