DI021A Ductile Iron Reflux Valve PN-20 (Flanged)

di021a
  • Item Code: DI021A
  • Pressure Rating: PN-20
  • Testing Standard: As per IS 5321
  • Size Range: 50mm to 300mm
  • Product Standard: As per 5321

Suitable For

di021a

Material Specification

P. NO. NAME OF PART MATERIAL SPECIFICATION
1 STUDS & NUTS CARBON STEEL BS 916
2 COVER DUCTILE IRON ASTM A395
3 GASKET RUBBER / C.N.A.F. IS 638 TYPE B
4 HINGE PIN H.T. BRASS BS 2872 OR BS 2874 CZ114
5 HINGE D.I. / C.C.S. ASTM A395 / ASTM A216 Gr. WCB
6 BODY DUCTILE IRON ASTM A395
7 SEAT RING GUN METAL BSEN 1982 Gr. CC491K
8 DISC DUCTILE IRON ASTM A395
9 DISC RING GUN METAL BSEN 1982 Gr. CC491K
10 WASHER BRASS / GUN METAL BS 2872 OR BS 2874CZ114 /
BSEN 1982 Gr. CC491K
11 NUT H.T. BRASS IS 6912 Gr.FHTB1
12 SIDE PLUG STAINLESS STEEL ASTM A276 TYPE 410
di021a

Dimensional Data

di021a
 
SIZE (mm) 50 65 80 100 125 150 200 250 300
A 203±2 216±2 241±2 292±3 350±2 356±2 495±2 622±4 698±4
B 16 16 21 22 23.8 23 24.5 26 27.5
∅C 50 65 80 100 125 150 200 250 300
~H 126 145 154 196 196 204 242 281 337
∅D 165 185 200 220 254 285 340 395 445
K 125 145 160 180 215.9 240 295 350 400
n 4 4 4 8 8 8 8 12 12
∅d 19 19 19 19 22.2 23 23 23 23

Principle Features

INTRODUCTION

Leader Ductile Reflux Valves are designed with high sensitivity to pressure so that the valve closes immediately before significant fluid starts flowing backward. Fluid reversing backward causes damage to equipment like boilers or pumps. The valve is activated by the flowing material in the pipeline. The pressure of the fluid passing through the system opens the valve, while any reversal of flow will close the valve. Closure is accomplished by the weight of the check mechanism, by back pressure. Entirely automatic in action, depending upon differential pressure and velocity of flow within the line to perform their functions of opening and closing.

  • Designed as per IS: 5312.
  • Bolted Cover, Swing Disc design.
  • Metal to Metal seating.
  • Body castings made of superior Ductile Iron ASTM A395 grade to ensure additional strength.
  • Gun Metal Body & Disc rings.
  • Design Prohibits Galling or Scoring of Seating Surfaces.
  • One-Piece Disc Construction Designed to Withstand Severe Service Conditions.
  • Large Bolted-On Cover Provides Easy Access to Interior for Routine Maintenance.
  • Rigid & Sturdy design.
  • Long service life as wear is minimal which makes it highly reliable.
  • Valve is mechanically automatic and thus it does not need an actuator or valve operator.
  • A horizontal or vertical duct can be used, easy to install.
  • The valve must be installed in the direction of the flow arrow.
  • Flanged ends as per ASME B16.5 CL-150 (FF).
  • Widely applied for low-pressure and ambient-temperature utility services such as water supply, power plants, irrigation projects, air conditioning systems as well as fire fighting systems to prevent the backflow.

END CONNECTION

  • Flanges as per ASME B16.5 CL-150 (FF), Drilled.
  • Flange drilling as per other standards also available upon request.

UTILISATION & SERVICE

  • “LEADER” Ductile Iron Reflux Valve are suitable for above-ground installations.
  • Best suited for potable water, treated fresh water, neutral liquids & some gases.

WORKING PRESSURE

  • Maximum Working Pressure: 20 Bar.
  • See Pressure / Temperature Diagram.

TEMPERATURE LIMITS

  • Maximum Working Temperature: 220°C.
  • See Pressure / Temperature Diagram.

TEST PRESSURE (Hydrostatic)

Rating PN-20
Body (Hyd.) 30 Bar
Seat (Hyd.) 22 Bar

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