Watts 252A - Manual (Page 2)

ES-252A 0403 © Watts Regulator Co., 2004 Printed in U.S.A.
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
A
D
C
Flow
Flow
Pressure Drop
Pressure Drop
Series 252A
Adjusting Spring Range Chart
SIZE *ADJUSTABLE RANGES SPRING AND MODEL NO.
in. mm psi bars
1 ⁄
2
15 3 – 15 .21 – 1.05 145
1 ⁄
2
15 10 – 50 .70 – 3.51 146
1 ⁄
2
15 30 – 140 2.11 – 9.84 141
3 ⁄
4
20 3 – 15 .21 – 1.05 145
3 ⁄
4
20 10 – 50 .70 – 3.51 146
3 ⁄
4
20 30 – 140 2.11 – 9.84 141
*The minimum reduced pressure ranges shown are recommended
only when very sensitive regulation service is needed for specific
requirements. However, all valves may be adjusted below the working
range minimums shown for lower regulation or complete shut off.
SIZE (DN) DIMENSIONS WEIGHT
A C D
in. mm in. mm in. mm in. mm lbs. kg.
1 ⁄
2
15 6 152 7 178 1 15 ⁄
16
49 11 4.99
3 ⁄
4
20 6 152 7 178 1 15 ⁄
16
49 11 4.99
bars psi
1.4 20
1.0 15
0.7 10
0.3 5
0 0
2 4 6 8 10 12 gpm
7.6 15.2 22.8 30.4 38 45.6 lpm
bars psi
1.4 20
1.0 15
0.7 10
0.3 5
0 0
5 10 15 20 25 30 35 gpm
19 38 57 76 95 114 133 lpm
Quick Reference Capacity Chart For Average Conditions
From From From From From From From From From
psi bar psi bar psi bar psi bar psi bar psi bar psi bar psi bar psi bar
Initial Pressure 50 3.52 75 5.27 100 7.03 125 8.79 150 10.55 175 12.3 200 14.06 225 15.82 250 17.58
Up To Up To Up To Up To Up To Up To Up To Up To Up To
Reduced Pressure 20 1.41 35 2.46 50 3.52 60 4.22 70 4.92 80 5.62 90 6.33 100 7.03 125 8.79
in. mm *Maximum Capacities in Lbs. of Steam Per Hour
252A 1 ⁄
2
" 15 80 111 143 175 205 237 270 299 332
252A 3 ⁄
4
" 20 285 394 506 620 726 841 956 1060 1178
*1 Lb. Steam Equals 970 BTU Per Hour
252A Size 1 ⁄ 2 " (15mm)
252A Size 3 ⁄
4
" (20mm)
Range 30 - 140
Range 10 - 50
Range 3 - 15
Range 30 - 140
Range 10 - 50
Range 3 - 15
Dimensions — Weights
Capacity