VALVAX
VX-NSCV-1601 to VX-NSCV-1606

Axial Flow Non-Slam Check Valve

API 6D axial-flow non-slam check valve with soft seat and metal-to-metal seating options. Spring-loaded diffuser disc closes before flow reversal, eliminating water hammer completely.

API 6DASME B16.10ASME B16.5API 598
Pressure
Class 150–2500
Size Range
2" to 24"
Testing
API 598

⚠ Pending engineering review: Pending engineering sign-off: pressure figure is a hydro-test (shell) value, not a confirmed Class rating. Fire-safe (API 607/6FA) claim also needs confirmation for this valve type.

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VX-NSCV-1601 to VX-NSCV-1606HYDRO-TESTED · API 598
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VX-NSCV-1601 to VX-NSCV-1606One pressure envelope · scroll to explore

01

Pressure Rating

Class 150–2500 (32–651 Kg/cm²)

Reference standard & materials

Same data as the printed catalogue

Reference standard

Mfg. Std.
API 6D
Face to Face
ASME B16.10
Flange End
ASME B16.5
Butt Weld End
ASME B16.25
Insp. & Test.
API 598
Fire Safe
API 607 / API 6FA
Press & Temp.
ASME B16.34
Axial Flow Non-Slam section with numbered callouts

Material of construction

No.DescriptionCarbon SteelAlloy SteelStainless SteelDuplex Stainless Steel
01BodyASTM A216 GR.WCBASTM A217 GR.WC9ASTM A351 GR.CF8MASTM A995 GR.5A
02Seat RingIntegral with Body + Stellite 6Integral with Body + Stellite 6Integral with Body + Stellite 6Integral with Body + Stellite 6
03DiscASTM A351 GR.CF8MASTM A351 GR.CF8MASTM A351 GR.CF8MASTM A995 GR.5A
04DiffuserASTM A216 GR.WCBASTM A217 GR.WC9ASTM A351 GR.CF8MASTM A995 GR.5A
05StemSS 304 / SS 316SS 304 / SS 316SS 316ASTM A182 GR.F53
06SpringInconel X-750Inconel X-750Inconel X-750Inconel X-750

Dimensions

mm · ASME B16.5 flange details · weights on request

Class
Axial Flow Non-Slam dimensioned section
150#Model no. VX-NSCV-1601
A (FE)Flange Details, ASME B16.5
SizeDNSPODPCDRFDTØHN
2"50120152120.692.114.31904
2.5"65120178139.7104.815.71904
3"80120190152.4127.017.51904
4"100140229190.5157.222.419—
5"125———————
6"150210279241.3215.923.92208
8"200280343298.4269.926.92208
10"250350406362.0323.828.42512
12"300350483431.8381.030.22512
14"350405533476.2412.833.32912
16"400455597539.8469.935.12916
18"450520635577.8533.438.13216
20"500570698635.0584.241.13220
24"600685813749.3692.246.03520

Technical specifications

Material
Body: ASTM A216 GR.WCB (CS) / ASTM A351 GR.CF8M (SS) / ASTM A995 GR.5A (Duplex)
Pressure Rating
Class 150–2500 (32–651 Kg/cm²)
Temperature Range
-29°C to +427°C (CS body; INCONEL X-750 spring)
Eng Note
Pending engineering sign-off: pressure figure is a hydro-test (shell) value, not a confirmed Class rating. Fire-safe (API 607/6FA) claim also needs confirmation for this valve type.
Size Range
2" to 24" (DN 50–600)
Seat Ring
Integral with body + Stellite 6
Disc
ASTM A351 GR.CF8M
Diffuser
ASTM A216 GR.WCB (CS) / ASTM A217 GR.WC9 (Alloy)
Stem
SS 304 / SS 316
Spring
INCONEL X-750
End Connections
Flanged (ASME B16.5), RTJ, Butt Weld (ASME B16.25)
Face T To Face
ASME B16.10 (Short Pattern)
Model Numbers
VX-NSCV-1601 (Cl.150) to VX-NSCV-1606 (Cl.2500)

Standards & testing

  • MFG. STD: API 6D
  • Face to Face: ASME B16.10
  • Flange End: ASME B16.5
  • Insp. & Test: API 598
  • Press. & Temp: ASME B16.34

Custom engineering

Special trims, exotic materials and non-standard dimensions are available against your datasheet — send it with your quote request and our engineering team will respond with a compliant proposal.

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Dual Plate Check Valve – Wafer Type

Retainer-less, metal-seated dual plate check valve per API 594 in a compact wafer body clamped between two line flanges. INCONEL X-750 spring gives fast, non-slam closure for high-velocity service.

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Dual Plate Check Valve – Double Flange End

Retainer-less, metal-seated dual plate check valve per API 594 in a full double-flange body per ASME B16.5. Self-supporting on the line without relying on the mating flanges, with the same INCONEL X-750 non-slam closure as the Wafer and Full Lug types.

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Dual Plate Check Valve – Full Lug Type

Retainer-less, metal-seated dual plate check valve per API 594 in a tapped full-lug body that bolts directly to the line flanges, allowing downstream piping to be removed for end-of-line service without draining the run. Same INCONEL X-750 non-slam closure as the Wafer and Double Flange types.

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