AXIAL NO-SLAM CHECK VALVE
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.
SERIES
NSC-NSZ-NFC-NFZ-SSC-SSZ-SFC-SFZ
VALVE DESIGN
based on API 6D and customer requirementsbased 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 2500API 5000-API 15000
FACE-TO-FACE
As per API 6D standard/As per API 6A standard
END CONNECTIONS
RF, RTJ as per B16.5 &B16.47BW, Butt Welded as per B16.25Hub connection 6B, 6BX as per API6A
BODY DESIGN
Cast one-piece / bolted two pieces for size >20 inch.Forged bolted one-piece/ three-piece
SEAT DESIGN
Metal-seated with hard facing on disk and seat
FEATURES
Powerful spring for ultra-fast closing actionVenturi pattern design Minor friction between moving parts to eliminate any chance of jammingSpring assisted and short stroke No chattering effects to minimize pressure fluctuation during normal conditionsLow pressure dropHigh dynamic response and zero reverse flowNozzle design if the valve size>20 inch. for better flow regulationShort 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 testingCompliance with API 6A inspection and testing Fire safe and fire tested as per API 6FA/ 607PED 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
