For ASME Section VIII Steam Service on Unfired Pressure Vessels
ES-FIG41
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Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Series Figure 41
Bronze and Cast Iron Safety
Relief Valves
For Steam Service
Sizes: Bronze - 1⁄2" – 21⁄2" (15 – 65mm)
Cast iron - 1
1
⁄2" – 6" (40 – 150mm)
Figure 41 is a safety relief valve for steam service on unfired
pressure vessels and pressure reducing valve stations.
Figure 41 safety relief valves are rated up to 250psi and
406°F (208°C) saturated steam and meet ASME code
Section VIII.
Features
• 2 piece body design
• Enclosed springs
• 2-ring control provides precise pop action and
seat tightness
• Single unit cap and lifting lever
Approvals
Rated in accordance with ASME Section VIII
Pressure – Temperature
Maximum Working Pressure: 250psi (17.2 bar)
Maximum Working Temperature: 406°F (208°C)
Fig. 41
Bronze safety valves
Fig. 41
Flanged cast iron safety
valves
2
Ref. No. Part Name Material
1 Base Bronze
2 Base Ring Bronze
3 Base Ring Set Screw Brass
4 Disc Bronze
5 Guide and Ring Bronze
6 Guide Ring Set Screw Brass
7 Spindle Steel
8 Spring Plated Steel
9 Spring Washer Steel
10 Bonnet Bronze
11 Adjusting Bolt Brass
12 Adjusting Bolt Locknut Plated Steel
13 Lifting Cap Zinc Alloy/Steel
14 Lifting Cap Pin Plated Steel
15 Spindle Nut Plated Steel
16 Spindle Nut Locknut Plated Steel
17 Seal and Wire Stainless Steel
Dimensions — Weights
Watts Bronze Safety Relief Valves
Figure 41
Materials
VALVE SIZE ORIFICE SIZE DIMENSIONS WEIGHT
Inlet x Outlet A B C D* E
in. mm in. mm in. mm in. mm in. mm in. mm lb. kgs.
1
⁄2 x 3⁄4 15 x 20 D 69⁄16 167 13⁄8 35 21⁄4 57 13⁄8 35 11⁄8 29 2 0.9
3
⁄4 x 3⁄4 20 x 20 D 69⁄16 167 13⁄8 35 21⁄4 57 13⁄8 35 11⁄4 32 2.25 1.0
3
⁄4 x 1 20 x 25 E 71⁄8 181 15⁄8 41 25⁄16 59 13⁄8 35 11⁄4 32 2.5 1.1
1 x 1 25 x 25 E 71⁄8 181 15⁄8 41 25⁄16 59 13⁄8 35 11⁄2 38 2.75 1.2
1 x 11⁄4 25 x 32 F 9 229 17⁄8 48 213⁄16 71 113⁄16 46 11⁄2 38 4 1.8
11⁄4 x 11⁄4 32 x 32 F 9 229 17⁄8 48 213⁄16 71 113⁄16 46 13⁄4 44 4.25 1.9
1
1
⁄4 x 11⁄2 32 x 40 G 911⁄16 246 21⁄8 54 3 76 113⁄16 46 17⁄8 48 7 3.2
11⁄2 x 11⁄2 40 x 40 G 911⁄16 246 21⁄8 54 3 76 113⁄16 46 21⁄16 52 7.25 3.3
1
1
⁄2 x 2 40 x 50 H 121⁄8 308 29⁄16 65 31⁄2 89 23⁄4 70 21⁄4 57 13.5 6.1
2 x 2 50 x 50 H 121⁄8 308 29⁄16 65 31⁄2 89 23⁄4 70 29⁄16 65 13.75 6.2
2 x 21⁄2 50 x 65 J 135⁄16 338 31⁄8 79 33⁄4 95 23⁄4 70 23⁄4 70 17.5 7.9
2
1
⁄2 x 21⁄2 65 x 65 J 135⁄16 338 31⁄8 79 33⁄4 95 23⁄4 70 3 76 17.75 8.0
*Add 1⁄2" to D dimension when lever is pulled out to manually operate the valve.
3
Ref. No. Part Name Material
1 Body ASTM A126-B (Grey Iron)
2 Bonnet ASTM A126-B (Grey Iron)
3 Nozzle ASTM B26 (Bronze)
4 Nozzle Ring ASTM B584-844 (Bronze)
5 Disc ASTM B62 (Bronze)
6 Guide Ring ASTM B584-844 (Bronze)
7 Adjusting Bolt ASTM B16 (Brass)
8 Adjusting Bolt Locknut Steel (Zn Plate)
9 Nozzle Ring Set Screw Brass
10 Guide Ring Set Screw Brass
11 Spindle ASTM A108 Grade 1212
12 Spindle Nut ASTM A108 Grade 1212
13 Spindle Nut Lock nut Steel AISI (Zn Plate)
14 Lifting Cap A126-B Cast Iron
15 Lifting Cap Pins Steel 1020 (Zn Plate)
16 Pivot Post Steel AISI
17 Post Pin Steel AISI 1070 (Zn Plate)
18 Spring Washer Steel AISI 1212
19 Spring Steel (Zn Plate)
20 Stud Steel ASTM A193 B7
21 Stud Nut Steel ASTM A194 2H
22 Name Plate SST AISI 304
23 Name Plate Screws SST 18-8
24 Lead Seal Lead Commercial
25 Seal Wire SST AISI 304
26 Lifting Lever A126-B Cast Iron
27 Clevis Pin Steel (Zn)
28 Cotter Pin Steel
29 Liftcap Lockscrew Steel
Dimensions — Weights
Watts Cast Iron Safety Relief Valves
Figure 41
Materials
VALVE SIZE ORIFICE SIZE DIMENSIONS WEIGHT
Inlet & Outlet (in.) A B C D E
in. mm in. mm in. mm in. mm in. mm in. mm lb. kgs.
11⁄2-250# x 21⁄2 NPT 40 – 65 J 15 381 31⁄4 83 41⁄4 108 3 76 – – 24 11
11⁄2 NPT x 21⁄2 NPT 40 – 65 J 141⁄2 368 31⁄4 83 41⁄4 108 3 76 23⁄4 70 20 9
2-250# x 3 NPT 50 – 80 J,K 15
3
⁄4 400 4 102 45⁄8 117 31⁄2 89 – – 42 19
2 NPT x 3 NPT 50 – 80 K 153⁄4 400 4 102 45⁄8 117 31⁄2 89 35⁄8 92 36 16
21⁄2-250# x 3 NPT 65 – 80 K 153⁄4 400 4 102 43⁄4 121 31⁄2 89 – – 45 20
21⁄2-250# x 4 NPT 65 – 100 L 23 584 51⁄8 130 51⁄2 140 6 152 – – 105 48
2
1
⁄2 NPT x 4 NPT 65 – 100 L 23 584 51⁄8 130 51⁄2 140 6 152 41⁄2 114 97 44
3-250# x 3 NPT 80 – 80 K 153⁄4 400 4 102 5 127 31⁄2 89 – – 48 22
3-250# x 4 NPT 80 – 100 L,M 23 584 5
1
⁄8 130 51⁄2 140 6 152 – – 107 49
3-NPT# x 4 NPT 80 – 100 M 231⁄8 587 51⁄8 130 55⁄8 143 6 152 41⁄2 114 99 45
4-250# x 6-125# 100 – 150 N,P 281⁄2 724 71⁄4 184 63⁄4 171 6 152 – – 212 96
6-250# x 8-125# 150 – 200 Q,R 45
5
⁄16 1151 10 254 91⁄4 235 101⁄2 267 – – 675 306
ES-FIG41 0643 © Watts Regulator Company, 2006
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
Water Safety & Flow Control Products
Capacities
WATTS FIG. 41 ASME SECTION VIII SERIES VALVES SATURATED STEAM CAPACITIES (LBS/HR @ 90% RATING AND 10% OVERPRESSURE)
Orifice Area D E F G H J K L M N P Q R
(in2) 0.1188 0.2116 0.3318 0.5424 0.8479 1.391 1.892 2.935 3.715 4.468 6.564 11.365 16.475
Set Press.
psi
15 176 313 491 802 1254 2057 2798 4340 5494 6606 9706 16804 24360
20 203 361 566 925 1445 2371 3225 5003 6335 7617 11190 19374 28085
25 229 409 641 1047 1637 2686 3653 5667 7175 8627 12674 21943 31809
30 256 456 716 1170 1829 3000 4081 6330 8015 9637 14158 24513 35534
35 286 509 798 1305 2040 3346 4551 7060 8939 10748 15790 27339 39631
40 315 562 881 1440 2251 3692 5022 7790 9863 11859 17422 30165 43729
45 345 614 963 1575 2461 4038 5492 8520 10787 12970 19055 32992 47826
50 374 667 1046 1709 2672 4384 5963 9250 11711 14081 20687 35818 51923
55 404 720 1128 1844 2883 4730 6433 9980 12636 15193 22320 38645 56020
60 434 772 1211 1979 3094 5076 6904 10710 13560 16304 23952 41471 60117
65 463 825 1293 2114 3305, 5422 7374 11440 14484 17415 25585 44297 6U-1-5
70 493 877 1376 2249 3516 5768 7845 12170 15408 18526 27217 47124 68312
75 522 930 1458 2384 3727 6114 8316 12900 16332 19637 28849 49950 72409
80 552 983 1541 2519 3937 6460 8786 13630 17256 20748 30482 52777 76506
85 581 1035 1623 2654 4148 6805 9257 14359 18180 21860 32114 55603 80604
90 611 1088 1706 2789 4359 7151 9727 15089 19105 22971 33747 58429 84701
95 640 1140 1788 2923 4570 7497 10198 15819 20029 24082 35379 61256 88798
100 670 1193 1871 3058 4781 7843 10668 16549 20953 25193 37012 64082 92895
105 699 1246 1953 3193 4992 8189 11139 17279 21877 26304 38644 66909 96992
110 729 1298 2036 3328 5203 8535 11609 18009 22801 27415 40276 69735 101090
115 758 1351 2118 3463 5414 8881 12080 18739 23725 28527 41909 72561 105187
120 788 1404 2201 3598 5624 9227 12550 19469 24649 29638 43541 75388 109284
125 818 1456 2283 3733 5835 9573 13021 20199 25574 30749 45174 78214 113381
130 847 1509 2366 3868 6046 9919 13491 20929 26498 31860 46806 81041 117479
135 877 1561 2448 4003 6257 10265 13962 21659 27422 32971 48438 83867 121576
140 906 1614 2531 4137 6468 10611 14432 22388 28346 34082 50071 86693 1256731
145 936 1667 2614 4272 6679 10957 14903 23118 29270 35194 51703 89520 129770
150 965 1719 2696 4407 6890 11303 15373 23848 30194 36305 53336 92346 133868
155 995 1772 2779 4542 7100 11648 15844 24578 31118 37416 54968 95173 137965
160 1024 1825 2861 4677 7311 11994 16314 25308 32043 38527 56601 97999 142062
165 1054 1877 2944 4812 7522 12340 16785 26038 32967 39638 58233 100825 146159
170 1083 1930 3026 4947 7733 12686 17256 26768 33891 40749 59865 103652 150256
175 1113 1982 3109 5082 7944 13032 17726 27498 34815 41861 61498 106478 154354
180 1143 2035 3191 5217 8155 13378 18197 28228 35739 42972 63130 109305 158451
185 1172 2088 3274 5352 8366 13724 18667 28958 36663 44083 64763 112131 162548
190 1202 2140 3356 5486 8577 14070 19138 29688 37587 45194 66395 114957 166645
195 1231 2193 3439 5621 8787 14416 19608 30418 38512 46305 68028 117784 170743
200 1261 2246 3521 5756 8998 14762 20079 31147 39436 47416 69660 120610 174840
205 1290 2298 3604 5891 9209 15108 20549 31877 40360 48527 71292 123437 178937
210 1320 2351 3686 6026 9420 15454 21020 32607 41284 49639 72925 126263 183034
215 1349 2403 3769 6161 9631 15800 21490 33337 42208 50750 74557 129089 187131
220 1379 2456 3851 6296 9842 16146 21961 34067 43132 51861 76190 131916 191229
225 1408 2509 3934 6431 10053 16492 22431 34797 44057 52972 77822 134742 195326
230 1438 2561 4016 6566 10263 16837 22902 35527 44981 54083 79455 137569 199423
235 1468 2614 4099 6700 10474 17183 23372 36257 45905 55194 81087 140395 203520
240 1497 2667 4181 6835 10685 17529 23843 36987 46829 56306 82719 143221 207618
245 1527 2719 4264 6970 10896 17875 24313 37717 47753 57417 84352 146048 211715
250 1556 2772 4346 7105 11107 18221 24784 38447 48677 58528 85984 148874 215812
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