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Butterfly valves

Butterfly valves

Butterfly valve is a type of valve which can be used in a variety of chemical services. They are available with small dimensions allowing for use in areas where space is limited, and they allow a high coefficient of flow.
A butterfly valve is composed of body, soft seat or hard seat, disc, stem, packing, notched position plate, and a lever or gear. The seat is under compression when it is mounted in the valve body, thus making a seal around the periphery of the disc both upper and lower points where the stem passes through the seat. Packing is provided forming a positive seal around the stem for added protection in case the seal formed by the seat could become damaged.

Butterfly valve Design Construction and Specifications

Butterfly valves design and manufacture comply to MSS SP 67-1997
Each are tested according to API 598,and marking is per MSS SP-25
Face to face dimension complies to BSS5155
Butterfly valve Flanges comply to API 605
Pressure-temperature grade complies to ANSI B6.34

Construction is as follows

* Anti-Blowout spring pin
* Position Indicator plate

Standard Material Specification

NO. PART NAME Standard Stainless Steel
1 Body ASTM A216-WCB/316 overlay ASTM A351-CF8M
2 Disc ASTM A216-WCB ASTM A351-CF8M
3 Disc Retaining Ring ASTM A182-F316 ASTM A182-F316
4 Steel Seal Ring ASTM A182-F316 ASTM A182-F316
5 Seal Ring Graphite/PTFE Graphite/PTFE
6 Gland Flange ASTM A216-WCB ASTM A351-CF8
7 Shaft ASTM A182-F316 ASTM A182-F316
8 Gland ASTM A182-F316 ASTM A182-F316
9 Spacer Ring ASTM A182-F316 ASTM A182-F316
10 Gasket SS316+Graphite SS316+Graphite
11 End Cover ASTM A105 ASTM A182-F316
12 Yoke ASTM A216-WCB ASTM A351-CF8M
13 Bearing ASTM A182-F316/Cr plated ASTM A182-F316/Cr plated
14 Hemicycle Ring ASTM A182 -F316 ASTM A182 -F316
15 Packing Graphite/PTFE Graphite/PTFE
16 Screw ASTM A193-B7 ASTM A193-B8
17 Gland Bolt ASTM A193-B7 ASTM A193-B8
18 Disc Screw S.S. S.S.
19 Disc Pin S.S. S.S.
20 Body Stud ASTM A193-B7 ASTM A193-B8
21 Body Nut ASTM A194 -2H ASTM A194 -8

Butterfly valve Dimensions data

Class 150 - ISO PN20(PN6,PN10,PN16)

Valve Size H1 H2 A L Approximate Weight(kg)
inch mm Lug Wafer flanged (Short Pattern) Lug Wafer Flanged
3" 80 157 239 45 48 48 114 17 15 22
4" 100 179 280 45 54 54 127 19 17 25
6" 150 194 310 45 57 57 140 30 27 39
8" 200 230 330 75 64 64 152 37 33 48
10" 250 280 380 80 71 71 165 50 45 65
12" 300 310 450 100 81 81 178 81 69 100
14" 350 340 500 110 92 92 190 96 86 125
16" 400 365 510 110 102 102 216 137 122 177
18" 450 436 640 135 114 114 222 158 141 205
20" 500 450 660 150 127 127 229 214 191 277
24" 600 530 820 170 154 154 267 291 260 377
28" 700 600 903 170 165 165 292 426 380 551
30" 750 630 930 170 190 190 318 616 550 798
32" 800 696 967 175 190 190 318 728 650 943
36" 900 760 1105 175 203 203 330 930 830 1204
40" 1000 830 1175 175 216 216 410 1176 1050 1523
42" 1050 860 1210 175 229 229 410 1344 1200 1740
48" 1200 960 1320 200 254 254 470 1568 1400 2030

Class 300 - ISO PN50(PN25,PN40)

Valve Size H1 H2 A L Approximate Weight(kg)
inch mm Lug Wafer flanged (Short Pattern) Lug Wafer Flanged Short(I) Short(II)
3" 80 157 239 45 48 48 114 180 18 16 23 30
4" 100 179 280 45 54 54 127 190 20 18 26 34
6" 150 220 356 60 59 59 140 210 37 33 48 62
8" 200 260 420 80 73 73 152 230 52 46 67 87
10" 250 310 430 90 83 83 165 250 71 63 91 118
12" 300 345 480 100 92 92 178 270 109 97 141 183
14" 350 370 450 110 117 117 190 290 134 120 174 226
16" 400 390 550 120 133 133 216 310 213 190 276 359
18" 450 490 705 130 149 149 222 330 347 310 450 585
20" 500 520 750 140 159 159 229 350 431 385 558 725
24" 600 590 910 150 181 181 267 390 526 470 682 887

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Related Category: Butterfly Valves

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