Product Overview

Materials
Series 174A
• Bronze body construction
• Nonmetallic disc-to-metal seating
Series 740
• Iron body construction
• Nonmetallic disc-to-metal seating
Pressure – Temperature
Series 174A
Pressure range: 30psi to 150psi (2 to 10 bar) with correspond-
ing high BTU/hr ratings from 650,000 to 14,370,000 BTU/hr.
Maximum Temperature: 250 ºF (121 ºC)
Series. 374A
Pressure range: rated up to 550,000 BTU/hr at a 30psi (2 bar)
setting. (Other settings available)
Series 740
Pressure range: 30psi to 75psi (2 to 5 bar) with corre-
sponding high ratings from 925,000 to 10,700,000 BTU/hr.
Maximum Temperature: 250 ºF (121 ºC)
Standards
Tested and rated by the National Board of Boiler and Pressure
Vessel Inspectors to the requirements of ASME. Meets Military
Spec. MIL-V-18634B, Type I, Class 3A, Style A (Bronze Body),
Style B (Iron Body).
ASME
Dimensions – Weights
Capacity*
BTU/hr Steam Pressure Discharge Capacities
As tested and rated by the National Board of Boiler and
Pressure Vessel Inspectors
SERIES 174A
Size (Dn) Height Length Weight
Model in. mm Model in. mm in mm lbs. kg.
374A
3
⁄4 x
3
⁄4 20 x 20 – 3
1
⁄2 90 2
1
⁄2 64 1.2 0.5
174A
3
⁄4 x
3
⁄4 20 x 20 M3 4
1
⁄2 116 2
3
⁄4 67 1.2 0.5
174A 1 x 1 25 x 25 M1 5
3
⁄4 144 3 76 1.9 0.9
174A 1
1
⁄4 x 1
1
⁄4 32 x 32 M1 8
1
⁄2 213 4
1
⁄4 109 4.6 2.1
174A 1
1
⁄2 x 1
1
⁄2 40 x 40 M 9
1
⁄4 232 4
3
⁄4 122 6.9 3.1
174A 2 x 2 50 x 50 M 11
1
⁄2 290 6
1
⁄2 162 14.4 6.5
SERIES 740
740
3
⁄4 x 1 20 x 25 M1 5
5
⁄8 143 3 76 1.88 9
740 1 x 1
1
⁄4 25 x 32 M 7
1
⁄4 184 3
1
⁄2 89 3.13 1.4
740 1
1
⁄4 x 1
1
⁄2 32 x 40 M 8
3
⁄4 222 4
5
⁄8 117 6.13 2.8
740 1
1
⁄2 x 2 40 x 50 M 9
1
⁄4 235 5
1
⁄4 133 7.50 3.4
740 2 x 2
1
⁄2 50 x 65 M 11
5
⁄8 295 6
3
⁄4 171 16.50 7.5
SERIES 174A
Set
Pressure
¾” x ¾” 1” x 1” 1¼” x 1¼” 1½” x 1½” 2” x 2”
20 x 20mm 25 x 25mm 32 x 32mm 40 x 40mm 50 x 50mm
psi bar Model M3 Model M1 Model M1 Model M Model M
30 2.07 650,000 1,005,000 1,682,000 2,020,000 3,815,000
33 2.27 695,000 1,075,000 1,788,000 2,150,000 4,080,000
35 2.41 725,000 1,125,000 1,877,000 2,250,000 4,250,000
36 2.48 740,000 1,145,000 1,916,000 2,310,000 4,344,000
40 2.76 800,000 1,240,000 2,071,000 2,490,000 4,690,000
45 3.1 875,000 1,355,000 2,265,000 2,720,000 5,130,000
50 3.45 950,000 1,470,000 2,459,000 2,950,000 5,575,000
55 3.79 1,025,000 1,590,000 2,653,000 3,190,000 6,010,000
60 4.13 1,100,000 1,702,000 2,847,000 3,425,000 6,450,000
65 4.58 1,170,000 1,820,000 3,041,000 3,660,000 6,890,000
70 4.82 1,245,000 1,935,000 3,325,000 3,890,000 7,330,000
75 5.17 1,320,000 2,055,000 3,429,000 4,125,000 7,770,000
80 5.51 1,400,000 2,166,000 3,605,000 4,360,000 8,215,000
85 5.86 1,470,000 2,285,000 3,817,000 4,590,000 8,650,000
90 6.6 1,545,000 2,400,000 4,011,000 4,825,000 9,090,000
95 6.55 1,620,000 2,520,000 4,205,000 5,060,000 9,530,000
100 6.89 1,695,000 2,635,000 4,399,000 5,290,000 9,970,000
105 7.23 1,770,000 2,750,000 4,593,000 5,525,000 10,410,000
110 7.58 1,845,000 2,865,000 4,787,000 5,760,000 10,850,000
115 7.92 1,920,000 2,980,000 4,981,000 5,990,000 11,290,000
120 8.27 1,995,000 3,100,000 5,175,000 6,225,000 11,730,000
125 8.61 2,070,000 3,215,000 5,370,000 6,460,000 12,170,000
130 8.96 2,145,000 3,330,000 5,564,000 6,690,000 12,610,000
135 9.3 2,220,000 3,445,000 5,758,000 6,925,000 13,050,000
140 9.65 2,295,000 3,565,000 5,952,000 7,160,000 13,490,000
145 9.99 2,370,000 3,680,000 6,146,000 7,390,000 13,390,000
150 10.34 2,445,000 3,795,000 6,340,000 7,630,000 14,370,000
SERIES 740
Set
Pressure
3
⁄4” x 1” 1” x 1
1
⁄4” 1
1
⁄4” x 1
1
⁄2” 1
1
⁄2” x 2” 2” x 2
1
⁄2”
20 x 25mm 25 x 32mm 32 x 40mm 40 x 50mm 50 x 65mm
psi bar Model M1 Model M Model M Model M Model M
30 2.07 925,000 1,300,000 2,105,000 2,900,000 5,250,000
33 2.27 989,000 1,390,000 2,250,000 3,100,000 5,613,000
35 2.41 1,032,000 1,450,000 2,345,000 3,235,000 5,855,000
36 2.48 1,053,000 1,480,000 2,395,000 3,300,000 5,975,000
40 2.76 1,139,000 1,600,000 2,590,000 3,569,000 6,461,000
45 3.10 1,245,000 1,750,000 2,830,000 3,903,000 7,067,000
50 3.45 1,352,000 1,899,000 3,075,000 4,237,000 7,672,000
55 3.79 1,459,000 2,049,000 3,315,000 4,572,000 8,277,000
60 4.13 1,566,000 2,200,000 3,560,000 4,907,000 8,883,000
65 4.58 1,672,000 2,349,000 3,800,000 5,241,000 9,488,000
70 4.82 1,779,000 2,499,000 4,045,000 5,575,000 10,093,000
75 5.17 1,886,000 2,649,000 4,285,000 5,909,000 10,700,000
ES-174A-740 1552 © 2015 Watts
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