Valves International

AIL Cast Steel Gate Valves
ASME Class 150, 300 and 600

AIL Gate Valves conform to API Standard 600 for Steel Gate Valves - Flanged and Butt welding ends. The valves are exceptionally sturdy, rugged and durable.

Body and Bonnet

The body is cast with uniform sections and generous radius fillets to prevent stress concentrations.
The body has a straight through port without recess except between the seats, which ensures minimum turbulence, erosion and resistance to flow. Long guide ribs in the body match with the full length guide slots in the wedge for accurate alignment and guidance.
Bonnet
The bolted bonnet, Outside Screw and Yoke type is fitted with a back seat bush to guide the stem and provide a back seat when the valve is fully open and under pressure.

The Yoke is cast integral with the bonnet in valves up to 12" (300mm) size. This ensures accurate alignment of the stem and reduces weight.

The Body-Bonnet joint for ASME Class 150 valves is oval in shape and flat faced. In ASME Class 300 and 600 valves, the bonnet joint is circular in shape and male-female type. Valves in 2" (50mm) size have a square body-bonnet configuration.

Flexible Wedge

AIL's one piece cast flexible wedge minimizes stress concentration. Wedge flexibility assures tight seating over a wide range of differential pressures and temperatures. It also adjusts for slight mis-alignments caused by pipeline deflections.
Wedge
The stem to wedge thrust is applied close to the wedge centre. This reduces lateral stem loading and provides for more accurate disc movement.

Seat Rings

Seal welded seat rings offer minimum pressure drop. Leakage through the path between the seat rings and the body is also eliminated. The seating surfaces are ground and lapped. Seat rings of gate valves in 2" (50mm) size are flared into the body.




Stem

The heat treated 13% Cr. Steel stem has accurate threads for wide engagement with the yoke sleeve.
The heavy forged 'T' head engages with the T-slot in the wedge. The stem also has an integral self adjusting radial back seat shoulder which matches with the back seat bush in the bonnet.
The stem surface is precisely machined and ground to reduce friction which minimizes leakage and extends stem packing life.

Stem

Stem to wedge connnection meets the requirements as per API Recommended Practice 591-Appendix 'C'


Stuffing Box

The stuffing Box with a smooth surface finish holds a minimum 5 packing rings. This ensures tightness and extends the life of packing rings. ASME Class 300 and 600 valves can be supplied with a lantern ring arrangement on request.

Yoke Sleeve

Cast in austenitic ductile iron alloy to provide resistance to heat, corrosion and wear, this alloy is also copper free. The long thread engagement assures accurate alignment of the stem.

In ASME Class 600 valves of size 6" (150mm) and above, the Yoke sleeve is mounted on thrust bearings to facilitate easy operation.

Flange drilling and facing finish

Standard range of AIL flanged valves in sizes up to 24" (600mm) are finished with end flanges faced, drilled and spot faced to ASME B16.5 RF. Class 600 valves are offered with RTJ end flanges on request. Flanges of larger size valves are drilled as per ASME B16.47 Series A.

The standard finish offered on the raised face is 125-250 µ in Ra (AARH) spiral serration. Concentric serration and smooth finish can also be offered on request.

Operation

All valves are provided with a steel/ductile iron/malleable iron handwheel for manual operation. Valves in size 24" C1 150; 20" C1 300; 16" C1 600 and above are offered with a fully enclosed bevel gear unit as a standard.

Standards

AIL Cast Steel Gate Valves conform to API Standard 600 and applicable requirements of BS 1414 standard.




AIL ASME CLASS 150 GATE VALVE

MATERIAL OF CONSTRUCTION
for standard valve
Item
No.
Description Material
 1  Body  ASTM A216 Gr.WCB
 2  Body Seat Ring  ASTM A105 + HF
 3  Wedge  ASTM A216 Gr.WCB
 + 13% Cr. Steel
 4  Stem  ASTM A182 Gr.F6a
 5  Gasket  ASTM A308
 6  Bonnet  ASTM A216 Gr.WCB
 7  Stud  ASTM A193 Gr. B7
 8  Stud Nut  ASTM A194 Gr. 2H
 9  Backseat Bush  13% Cr.
10  Packing  Graphite with braided
 end rings
11  Gland  Steel
12  Gland Flange  ASTM A105/A216
 Gr. WCB
13  Eye Bolt  Cr-Mo Steel
14  Eye Bolt Nut  ASTM A563 Gr. B
15  Groove Pin  Steel
16  Yoke Sleeve
 (Stem Nut)
 ASTM A439
 Type D2
17  Grease Fitting  Steel
18  Retainer Nut  Steel/Ductile Iron/
 Malleable Iron
19  Handwheel
20  Handwheel Nut
*  Name Plate  SS 304
FIGURE No. 113 - 8

Gate Valve Class 150

DIMENSIONS & WEIGHTS
Valve
size
inch 22.53468 101214161820 243036
mm50 6580100150200 250300350400 450500600750900
Ainch 77.58 910.511.5 131415 161718 202428
mm 178190203 229267292 330356381 406432457 508610711
Binch 14.818.918.9 2331.139.2 46.955.160.6 67.57785 101135147
mm 376480480 584790996 119113991539 171419562159 256534293734
Cinch 899 101214 161820 202424 273030
mm 203229229 254305356 406457508 508610610 686762762
Weightlbs 467077 117191356 462664902 114415781984 310259407370
kgs 213235 5387139 210302410 520690900 141031003350


AIL ASME CLASS 300 GATE VALVE

MATERIAL OF CONSTRUCTION
for standard valve
Item
No.
Description Material
 1  Body  ASTM A216 Gr.WCB
 2  Body Seat Ring  ASTM A105 + HF
 3  Wedge  ASTM A216 Gr.WCB
 + 13% Cr. Steel
 4  Stem  ASTM A182 Gr.F6a
 5  Gasket  Spirally Wound
 gasket SS 304 with
 graphite filler
 6  Bonnet  ASTM A216 Gr.WCB
 7  Stud  ASTM A193 Gr. B7
 8  Stud Nut  13% Cr.
 9  Backseat Bush  AISI 410/AISI 420
10  Packing  Graphite with braided
 end rings
11  Gland  Steel
12  Gland Flange  ASTM A105/A216
 Gr. WCB
13  Eye Bolt  Cr-Mo Steel
14  Eye Bolt Nut  ASTM A563 Gr. B
15  Groove Pin  Steel
16  Yoke Sleeve
 (Stem Nut)
 ASTM A439
 Type D2
17  Grease Fitting  Steel
18  Retainer Nut  Steel/Ductile Iron/
 Malleable Iron
19  Handwheel
20  Handwheel Nut
*  Name Plate  SS 304
FIGURE No. 133 - 8

Gate Valve Class 150

DIMENSIONS & WEIGHTS
Valve
size
inch 22.53468 101214161820 2430
mm506580 100150200250300350 400450500600750
Ainch 8.59.511.1 1215.816.5 1819.730 333639 4555
mm 216241282 305403419 457502762 838914991 11431400
Binch 15.719.919.9 23.832.740.9 49.857.562.6 70.584.589 104.5168
mm 399505505 6048301039 126514601590 179121462261 26544267
Cinch 899 101416 182020 242727 3040
mm 203229229 254356406 457508508 610686686 7621016
Weightlbs 55106117 172348515 78110891650 210828823608 54129240
kgs 254853 78158234 355495750 95813101640 24604200




AIL ASME CLASS 600 GATE VALVE

MATERIAL OF CONSTRUCTION
for standard valves
Item
No.
Description Material
 1  Body  ASTM A216 Gr.WCB
 2  Body Seat Ring  ASTM A105 + HF
 3  Wedge  ASTM A216 Gr.WCB
 + 13% Cr. Steel
 4  Stem  ASTM A182 Gr.F6a
 5  Gasket  Spirally Wound SS
 304 graphite filler
 6  Bonnet  ASTM A216 Gr.WCB
 7  Stud  ASTM A193 Gr. B7
 8  Stud Nut  ASTM A194 Gr. 2H
 9  Backseat Bush  13% Cr.
10  Packing  Graphite with braided
 end rings
11  Gland  Steel
12  Gland Flange  ASTM A105/A216
 Gr. WCB
13  Eye Bolt  Cr-Mo Steel
14  Eye Bolt Nut  ASTM A563 Gr. B
15  Groove Pin  Steel
16  Yoke Sleeve
 (Stem Nut)
 ASTM A439
 Type D2
17  Bearing  Steel
18  Yoke cap  Ductile Iron
19  Screw  Steel
20 Grease Fitting  Steel
21  Handwheel  Steel/Ductile Iron/
22  Handwheel Nut  Malleable Iron
*  Name Plate  SS 304
FIGURE No. 163 - 8

Gate Valve Class 600

DIMENSIONS & WEIGHTS
Valve
size
inch23 46810 1214161820
mm5080100 150200250300350400 450500
Ainch 11.51417 222631 333539 4347
mm 292356432 559660787 838889991 10921194
Binch 15.721.325 34.441.148.8 58.161.681.2 81.2120
mm 399541635 87410441239 147615652062 20623048
Cinch 81012 181820 242430 3030
mm 203254305 457457508 610610762 762762
Weightlbs 92147262 5559201434 242035204301 456510824
kgs 4267119 252418652 110016001955 20754920

AIL

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