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Check ANSI Tilting Disc Check Valve
Brand: Flowserve NAF ABThe circular wafer body is designed to be clamped between two pipe flanges.
The valve disc is suspended on two heavy stub shafts with the selected suspension points giving the fastest closing possible.
The seat is oblique in order to give a short closing travel and a short closing time. NAF-Check can also be supplied with an auxiliary spring.
Due to the lightweight disc, the auxiliary spring can shorten the closing time further and reduce water hammering to one fourth in comparison to use springless valves at quickly returning liquid flow. In order to facilitate installation, valves > size 2" (50.8 mm) are equipped with a lifting eye.
A cast arrow on the lifting eye indicates the flow direction.
Specifications
Brand
Applications
- Gas & Vapour Flow
- Liquid Flow
Approvals & Certifications
- API 598, 594
- ISO 9001
Approvals & Certifications
- CE-Marked According to Pressure Equipment Directive (PED 97/23/EG) Module H, Category III
Disc Material
- 329 Stainless Steel (ASTM A240 Grade 329)
- Cast Stainless Steel (ASTM A487 Grade CA6NM)
- Duplex Stainless Steel (EN 1.4470)
Enclosure, Body Material
- Cast 316 Stainless Steel - ASTM A351 Grade CF8M
- Cast Carbon Steel (ASTM A216 Gr WCC)
- Forged 316 Stainless Steel (ASTM A182 Gr F316)
Flange Size - 10” (DN 250)
- 10” (DN 250) - 150# ANSI
- 10” (DN 250) - 300# ANSI
Flange Size - 12” (DN 300)
- 12” (DN 300) - 150# ANSI
- 12” (DN 300) - 300# ANSI
Flange Size - 14” (DN 350)
- 14” (DN 350) - 150# ANSI
- 14” (DN 350) - 300# ANSI
Flange Size - 16” (DN 400)
- 16” (DN 400) - 150# ANSI
- 16” (DN 400) - 300# ANSI
Flange Size - 18” (DN 450)
- 18” (DN 450) - 150# ANSI
- 18” (DN 450) - 300# ANSI
Flange Size - 2” (DN 50)
- 2” (DN 50) - 150# ANSI
- 2” (DN 50) - 300# ANSI
Flange Size - 20” (DN 500)
- 20” (DN 500) - 150# ANSI
- 20” (DN 500) - 300# ANSI
Flange Size - 24” (DN 600)
- 24” (DN 600) - 150# ANSI
- 24” (DN 600) - 300# ANSI
Flange Size - 3” (DN 80)
- 3” (DN 80) - 150# ANSI
- 3” (DN 80) - 300# ANSI
Flange Size - 4” (DN 100)
- 4” (DN 100) - 150# ANSI
- 4” (DN 100) - 300# ANSI
Flange Size - 6” (DN 150)
- 6” (DN 150) - 150# ANSI
- 6” (DN 150) - 300# ANSI
Flange Size - 8” (DN 200)
- 8” (DN 200) - 150# ANSI
- 8” (DN 200) - 300# ANSI
Flange Type
- Raised Face (RF)
- RTJ - Ring Typical Joint
Media
- Gas
- Liquids
- Vapor
Operating Pressure
- psi: 122 to 719 (kPa: 8,400 to 4,960, bar: 8.4 to 49.6)
Proof Pressure
- Closed Valve - psi: 826.7 (kPa: 5,700, bar: 57) at ANSI Class 300
- Open Valve - psi: 449.6 (kPa: 3,100, bar: 31) at ANSI Class 150
- Test Pressure (Closed Valve) - psi: 319.1 (kPa: 2,200, bar: 22) at ANSI Class 150
- Test Pressure (Open Valve) - psi: 1,131 (kPa: 7,800, bar: 78) at ANSI Class 300
Shaft Material
- Stub Shaft: 329 Stainless Steel (ASTM A240 Gr 329)
- Stub Shaft: 410 Stainless Steel (ASTM A276)
Spring Material
- Stainless Steel (ASTM A564 Typical 635)
Temperature Range
- -30° to 350° C (-22° to 662° F)