Axial No-Slam Check Valve (NSC-NSZ-NFC-NFZ-SSC-SSZ-SFC-SFZ series)

Features & Benefits

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.

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 in 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