For ASME Section VIII Service on Air, Gas, Vapors
ES-FIG41A
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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 41A
Bronze and Cast Iron Safety
Relief Valves
For Air, Gas, and Vapors
Sizes: Bronze - 1⁄2" – 21⁄2" (15 – 65mm)
Cast iron - 1
1
⁄2" – 6" (40 – 150mm)
Figure 41A is a safety relief valve for air, gas and vapors. It is
used on compressors, receivers, burners and other piping
systems. Figure 41A safety relief valves are rated up to
250psi (17.2 bar) and 406˚ F (208˚ C) 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. 41A
Bronze safety valves
Fig. 41A
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 41A
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 lbs. 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 41A
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 lbs. kgs.
11⁄2-250# x 21⁄2 NPT 40 x 65 J 15 381 31⁄4 83 41⁄4 108 3 76 – – 24 11
11⁄2 NPT x 21⁄2 NPT 40 x 65 J 141⁄2 368 31⁄4 83 41⁄4 108 3 76 23⁄4 70 20 9
2-250# x 3 NPT 50 x 80 J,K 15
3
⁄4 400 4 102 45⁄8 117 31⁄2 89 – – 42 19
2 NPT x 3 NPT 50 x 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 x 80 K 153⁄4 400 4 102 43⁄4 121 31⁄2 89 – – 45 20
21⁄2-250# x 4 NPT 65 x 100 L 23 584 51⁄8 130 51⁄2 140 6 152 – – 105 48
2
1
⁄2 NPT x 4 NPT 65 x 100 L 23 584 51⁄8 130 51⁄2 140 6 152 41⁄2 114 97 44
3-250# x 3 NPT 80 x 80 K 153⁄4 400 4 102 5 127 31⁄2 89 – – 48 22
3-250# x 4 NPT 80 x 100 L,M 23 584 5
1
⁄8 130 51⁄2 140 6 152 – – 107 49
3-NPT# x 4 NPT 80 x 100 M 231⁄8 587 51⁄8 130 55⁄8 143 6 152 41⁄2 114 99 45
4-250# x 6-125# 100 x 150 N,P 281⁄2 724 71⁄4 184 63⁄4 171 6 152 – – 212 96
6-250# x 8-125# 150 x 200 Q,R 45
5
⁄16 1151 10 254 91⁄4 235 101⁄2 267 – – 675 306
ES-FIG41A 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
WATTS Fig. 41A ASME Section VIII Series Valves Saturated Steam Capacities (SCFM @ 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 63 111 175 285 446 732 996 1545 1956 2351 3455 5981 8671
20 72 128 201 329 514 844 1148 1781 2255 2711 3983 6896 9996
25 82 145 228 373 583 956 1300 2017 2554 3071 4511 7810 11322
30 91 162 255 416 651 1068 1453 2253 2853 3430 5039 8725 12648
35 102 181 284 464 726 1191 1620 2513 3182 3826 5620 9731 14106
40 112 200 313 512 801 1314 1787 2773 3511 4221 6201 10737 15565
45 123 219 343 560 876 1437 1955 3033 3840 4617 6782 11743 17023
50 133 237 372 608 951 1560 2122 3292 4169 5012 7363 12749 18482
55 144 256 402 656 1026 1684 2290 3552 4498 5408 7945 13755 19940
60 154 275 431 704 1101 1807 2457 3812 4826 5803 8526 14761 21398
65 165 294 460 753 1176 1930 2625 4072 5155 6199 9107 15767 22857
70 175 312 490 801 1251 2053 2792 4332 5484 6594 9688 16773 24315
75 186 331 519 849 1326 2176 2960 4592 5813 6990 10269 17779 25773
80 196 350 548 897 1402 2299 3127 4851 6142 7385 10850 18785 27232
85 207 368 578 945 1477 2422 3295 5111 6471 7781 11431 19791 28690
90 217 387 607 993 1552 2545 3462 5371 6800 8176 12012 20797 30149
95 228 406 637 1041 1627 2669 3630 5631 7129 8572 12593 21804 31607
100 238 425 666 1089 1702 2792 3797 5891 7458 8967 13174 22810 33065
105 249 443 695 1137 1777 2915 3965 6150 7787 9363 13755 23816 34524
110 259 462 725 1185 1852 3038 4132 6410 8116 9758 14336 24822 35982
115 270 481 754 1233 1927 3161 4300 6670 8445 10154 14917 25828 37440
120 280 500 783 1281 2002 3284 4467 6930 8774 10549 15498 26834 38899
125 291 518 813 1329 2077 3407 4635 7190 9103 10945 16079 27840 40357
130 302 537 842 1377 2152 3531 4802 7449 9432 11340 16660 28846 41816
135 312 556 872 1425 2227 3654 4970 7709 9761 11736 17241 29852 43274
140 323 575 901 1473 2302 3777 5137 7969 10090 12131 17822 30858 44732
145 333 593 930 1521 2377 3900 5305 8229 10418 12527 18403 31864 46191
150 344 612 960 1569 2452 4023 5472 8489 10747 12922 18984 32870 47649
155 354 631 989 1617 2527 4146 5640 8748 11076 13318 19565 33876 49107
160 365 649 1018 1665 2602 4269 5807 9008 11405 13713 20147 34882 50566
165 375 668 1048 1713 2677 4392 5974 9268 11734 14109 20728 35888 52024
170 386 687 1077 1761 2753 4516 6142 9528 12063 14504 21309 36894 53483
175 396 706 1106 1809 2828 4639 6309 9788 12392 14900 21890 37900 54941
180 407 724 1136 1857 2903 4762 6477 10047 12721 15295 22471 38906 56399
185 417 743 1165 1905 2978 4885 6644 10307 13050 15691 23052 39912 57858
190 428 762 1195 1953 3053 5008 6812 10567 13379 16086 23633 40918 59316
195 438 781 1224 2001 3128 5131 6979 10827 13708 16482 24214 41924 60774
200 449 799 1253 2049 3203 5254 7147 11087 14037 16877 24795 42930 62233
205 459 818 1283 2097 3278 5378 7314 11346 14366 17273 25376 43936 63691
210 470 837 1312 2145 3353 5501 7482 11606 14695 17668 25957 44942 65150
215 480 855 1341 2193 3428 5624 7649 11866 15024 18064 26538 45948 66608
220 491 874 1371 2241 3503 5747 7817 12126 15353 18459 27119 46954 68066
225 501 893 1400 2289 3578 5870 7984 12386 15682 18855 27700 47960 69525
230 512 912 1430 2337 3653 5993 8152 12646 16010 19251 28281 48966 70983
235 522 930 1459 2385 3728 6116 8319 12905 16339 19646 28862 49972 72441
240 533 949 1488 2433 3803 6239 8487 13165 16668 20042 29443 50979 73900
245 543 968 1518 2481 3878 6363 8654 13425 16997 20437 30024 51985 75358
250 554 987 1547 2529 3953 6486 8822 13685 17326 20833 30605 52991 76817
Capacities
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