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

Product Details
Spec Detail
Size Range NPS 2 – 56 (DN 50-1400) NPS 1.13/16- 21.1/4 (DN 46-540)
Pressure Class ASME 150 – ASME 2500 API 5000-API 15000
Standard Connections Flanged (RF, RTJ) as per B16.5 &B16.47, Butt Welded as per B16.25, Hub connection, 6B, 6BX as per API 6A
Series NSC-NSZ-NFC-NFZ-SSC-SSZ-SFC-SFZ
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)
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 Cast one-piece / bolted two pieces for size >20 inch.
Forged bolted one-piece/ three-piece
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Velan ABV API 6D No-Slam Check Valves – Reliable Reverse Flow Protection

As a leading Velan Valve Supplier, Distributor, and Stockist, we proudly offer Velan ABV’s API 6D No-Slam Check Valves—engineered for silent, automatic reverse flow prevention in critical pipelines. These high-performance valves ensure zero water hammer, rapid closure, and unmatched reliability, making them ideal for oil & gas, petrochemical, and power industries.

Key Features & Benefits

✔ Ultra-Fast Spring-Assisted Closing – Powerful spring and short stroke design eliminate reverse flow before pressure surges occur.
✔ Compact & Lightweight Option – Space-saving design without compromising durability.
✔ Metal-Seated with Hard Facing – Extended service life with CoCr or Stellite-coated disc/seats.
✔ Venturi Flow Design – Minimized pressure drop for efficient system performance.
✔ No Chattering or Jamming – Precision engineering ensures smooth operation under variable pressures.
✔ API 6D & Fire-Safe Certified – Compliant with API 6D, ISO 5208, API 598, API 6FA/607, and PED 2014/68/EU.

Technical Specifications

  • Standards: API 6D, API 6A (PSL 1-4, PR1/PR2/PR2F)

  • Sizes: 2″ to 20″ (compact & standard patterns)

  • Pressure Rating: ASME Class 150–2500

  • Fire-Safe: API 6FA / ISO 10497 certified

  • Testing: Hydrostatic, fugitive emissions, and fire testing

Why Choose Velan Valves?

As a trusted Velan Valve Distributor and Stockist, we guarantee:
Fast Delivery – Ready stock for urgent project needs.
Global Certifications – Full compliance with API, ISO, and PED standards.
Custom Solutions – Specialized trim, materials, and actuation options.

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