wafter type NRV

Salient Features and Specialities:

  • Spring closing arrangements for the prevention of reverse flow the pipelines.
  • These valves are general purpose valves that are stronger, lighter and smaller than conventional swing check valves and therefore, less expensive to install and maintain.
  • Suitable for higher pressure /temperature (up to 400oC).
  • Compact design for simple installation between wide ranges of flange types.
  • It can be mounted in any plane/direction.
  • Extremely low opening pressures.
  • Spring assisted silent closing.
  • Available sizes 15mm to 100mm,suitable for PN6-PN40 and 150/300.
  • Weight and Dimension are same for class 150 & class 300 valves.
  • Valves are self-centering type.
  • Zero leakage for soft seated valves.
  • The maximum permissible leakage rate shall be 3 cubic centimeters per inch of nominal pipe size for metal-seated valves.


Sr.No. NAME OF PARTS MATERIAL
1 BODY A.I.S.I 316 / W.C.B.
2 YOKE A.I.S.I 316
3 SPRING A.I.S.I 316
4 DISC. A.I.S.I 316
5 CIRCLIP A.I.S.I 316
SIZE (in MM) A B C D D1 D2
15 20 15 4 36 50 43
20 20 20 4 43 60 53
25 25 25 5 52 70 63
32 28 32 5 71 81 72
40 32 40 6 78 91 84
50 55 50 7 89.5 115 96
65 46 65 8 110 126 116
80 50 76 0 130 130  
100 60 100 0 159 159  
150 106 152 0 219 219  
200 145 203 0 270 270