Watts Figure 31 User Manual
ASME Section 1, Steam Boiler Applications
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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.
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