Watts Figure 31 User Manual

ASME Section 1, Steam Boiler Applications

ES-FIG31

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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 31

Bronze and Cast Iron Safety
Relief Valves

For Steam Boilers

Sizes: Bronze - 1⁄2" – 21⁄2" (15 – 65mm)

Cast iron - 1

1

⁄2" – 6" (40 – 150mm)

Figure 31 is a safety relief valve which provides over pressure
protection of steam boilers operating up to 250psi (17.2 bar)
and 406°F (208°C) saturated steam. Figure 31 safety relief
valves meet ASME Section 1 code.

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 I

Pressure – Temperature

Maximum Working Pressure: 250psi (17.2 bar)
Maximum Working Temperature: 406°F (208°C)

Fig. 31

Bronze safety valves

Fig. 31

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 31

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 31

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 – 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-FIG31 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. 31 ASME SECTION I SERIES VALVES SATURATED STEAM CAPACITIES (LBS/HR @ 90% RATING AND 3% 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

15 170 303 475 776 1213 1991 2708 4200 5318 6394 9394 16265 23579
20 197 351 550 899 1405 2305 3135 4863 6157 7403 10876 18831 27298
25 224 398 625 1021 1596 2619 3562 5526 6996 8412 12358 21396 31017
30 250 446 700 1144 1788 2933 3989 6188 7835 9420 13839 23962 34736
35 277 494 774 1266 1979 3247 4416 6851 8674 10429 15321 26527 38455
40 304 542 849 1388 2171 3561 4843 7513 9512 11437 16803 29093 42174
45 331 589 924 1511 2362 3875 5270 8176 10351 12446 18285 31658 45893
50 358 637 999 1633 2553 4189 5697 8838 11190 13455 19766 34224 49612
55 385 685 1074 1756 2745 4503 6125 9501 12029 14463 21248 36789 53331
60 411 733 1149 1878 2936 4817 6552 10163 12868 15472 22730 39355 57050
65 438 780 1224 2001 3128 5131 6979 10826 13707 16480 24212 41920 60769
70 466 829 1300 2126 3323 5451 7414 11502 14562 17509 25723 44537 64562
75 493 878 1377 2252 3520 5774 7854 12184 15426 18548 27249 47180 68393
80 521 928 1455 2378 3717 6098 8294 12866 16290 19587 28775 49822 72223
85 548 977 1532 2504 3914 6421 8734 13549 17154 20626 30302 52464 76054
90 576 1026 1609 2630 4111 6745 9174 14231 18018 21665 31828 55107 79884

95 604 1075 1686 2756 4308 7068 9614 14914 18882 22703 33354 57749 83715
100 631 1124 1763 2882 4506 7392 10054 15596 19746 23742 34880 60392 87546
105 659 1174 1840 3008 4703 7715 10494 16279 20610 24781 36406 63034 91376
110 687 1223 1917 3134 4900 1 8038 10934 16961 21474 25820 37932 65677 95207
115 714 1272 1995 3261 5097 8362 11374 17643 22338 26859 39459 68319 99037
120 742 1321 2072 3387 5294 8685 11813 18326 23202 27898 40985 70962 102868
125 769 1370 2149 3513 5491 9009 12253 19008 24066 28937 42511 73604 106699
130 797 1420 2226 3639 5688 9332 12693 19691 24930 29975 44037 76247 110529
135 825 1469 2303 3765 5886 9655 13133 20373 25794 31014 45563 78889 114360
140 852 1518 2380 3891 6083 9979 13573 1 21055 26658 32053 47090 81532 118190
145 880 1567 2457 4017 6280 10302 14013 21738 27522 33092 48616 84174 122021
150 908 1616 2535 4143 6477 10626 14453 22420 28386 34131 50142 86817 125851
155 935 1666 2612 4269 6674 10949 14893 23103 29250 35170 51668 89459 129682
160 963 1715 2689 4396 6871 11273 15333 23785 30114 36208 53194 92101 133513
165 990 1764 2766 4522 7068 11596 15773 24468 30978 37247 54721 94744 137343
170 1018 1813 2843 4648 7266 11919 16212 25150 31842 38286 56247 97386 141174
175 1046 1862 2920 4774 7463 12243 16652 25832 32706 39325 57773 100029 145004
180 1073 1912 2997 4900 7660 12566 17092 26515 33570 40364 59299 102671 148835
185 1101 1961 3075 5026 7857 12890 17532 27197 34434 41403 60825 105314 152666
190 1128 2010 3152 5152 8054 13213 17972 27880 35298 42442 62351 107956 156496
195 1156 2059 3229 5278 8251 13537 18412 28562 36162 43480 63878 110599 160327
200 1184 2108 3306 5404 8448 13860 18852 29244 37026 44519 65404 113241 164157
205 1211 2158 3383 5531 8646 14183 19292 29927 37890 45558 66930 115884 167988
210 1239 2207 3460 5657 8843 14507 19732 30609 38754 46597 68456 118526 171818
215 1267 2256 3538 5783 9040 14830 20172 31292 39618 47636 69982 121169 175649
220 1294 2305 3615 5909 9237 15154 20612 31974 40482 48675 71509 123811 179480
225 1322 2354 3692 6035 9434 15477 21051 32656 41346 49714 73035 126453 183310
230 1349 2404 3769 6161 9631 15800 21491 33339 42210 50752 74561 129096 187141
235 1377 2453 3846 6287 9829 16124 21931 34021 43074 51791 76087 131738 190971
240 1405 2502 3923 6413 10026 16447 22371 34704 43938 52830 77613 134381 194802
245 1432 2551 4000 6540 10223 16771 22811 35386 44802 53869 79140 137023 198633
250 1460 2600 4078 6666 10420 17094 23251 36069 45666 54908 80666 139666 202463

Capacities