Watts Figure 41A User Manual
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.
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