NAF – Check Non-Return ValveEnquire Now

NAF 8211 Check NonReturn Valve

BRAND: NAFCATEGORY: Gate, Globe & Check Valves

The NAF-Check tilting disc check non-return valve with its unique design gives excellent tightness and minimises water hammer. The centre of gravity of the disc and the oblique seat makes the valve fast closing, reducing the risk of pressure shocks and can be supplied with a spring to further reduce water hammer. The design of the valve allows it to be fully open at very low flow velocity (down to 0,6m/s) with low pressure drops. The low physical weight results in reduced handling costs and ease of installation while the short face to face is suitable for all flange standards.

The circular wafer body is designed to be clamped between two pipe flanges in accordance with DIN or ANSI. It offers excellent tightness, better than demanded in API 598 and is CE-marked according to Pressure Equipment Directive (PED 2014/68/EU) module H, category III.

Contact one of our technical specialists for a quote today or download the DIN brochure or the ANSI brochure to learn more!

Specifications

SeriesCheck
Design

Tilting Disk Check Non-Return

Features
  • Short face-to-face length – invaluable where space is limited
  • Low weight reduces handling costs and makes installation easier
  • Rapid response – oblique seat reduces closing travel time
  • Low pressure drop and low opening pressure
  • Fully open with water velocity of only 0.6 m/s -without closing spring
  • Excellent tightness, better than demanded in API 598
  • Can be furnished with auxilliary spring to further reduce water hammer in liquid media
Size
Range

40mm to 1000mm / 1½” to 40”

Pressure
Rating

PN10 – 25 / ANSI 150 – 300

Temperatures-30°C to 525°C
End
Connections
Wafer
Body
Materials
  • Stainless Steel EN 1.4404
  • Stainless Steel EN 1.4308
  • Carbon Steel EN 1.0619
  • ASTM A182 Gr F316
  • ASTM A351 Gr CF8M
  • ASTM A216 Gr WCB / WCC
Seat
Materials
Stainless Steel (Std) Welded hardened SS
Options &
Accessories
  • Auxiliary spring to further reduce water hammer
Applications

The NAF-Check can be used in any liquid, gas or vapour that is compatible with the valve materials. NAF recommend an auxiliary spring for liquid flow.

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