- Add 10 PSI (23') to customer specified operating head and locate on
pump curve. Log capacity and BHP from this point. Check to be sure motor
horsepower is large enough to handle this head.
- Convert head to PSI and add to pump suction pressure to determine PRV
setting.
- Go to PRV flow/pressure chart to select size of valve necessary.
Series 78-79 Brass Valves
Water Capacity in Gallons per minute (GPM) at 25% Over Pressure
SET
PRESSURE |
SEAT SIZE - Inches |
| 1/2 |
3/4 |
1 |
1 1/4 |
1 1/2 |
2 |
2 1/2 |
3 |
| 5 |
2.8 |
3.9 |
7.7 |
12 |
17 |
22 |
33 |
44 |
| 10 |
3.9 |
5.6 |
8.1 |
17 |
24 |
31 |
46 |
62 |
| 15 |
4.8 |
6.8 |
13 |
21 |
29 |
38 |
56 |
76 |
| 20 |
5.5 |
7.9 |
15 |
24 |
34 |
44 |
65 |
88 |
| 25 |
6.2 |
8.8 |
17 |
27 |
38 |
49 |
73 |
98 |
| 30 |
6.8 |
9.7 |
19 |
29 |
41 |
53 |
80 |
107 |
| 40 |
7.7 |
11 |
22 |
34 |
48 |
62 |
92 |
124 |
| 50 |
8.4 |
12 |
24 |
38 |
53 |
69 |
103 |
139 |
| 75 |
10.5 |
15 |
30 |
47 |
65 |
85 |
126 |
170 |
| 100 |
12 |
18 |
34 |
54 |
76 |
98 |
146 |
196 |
| 110 |
13.3 |
19 |
36 |
56 |
79 |
102 |
153 |
206 |
| 125 |
14 |
20 |
38 |
60 |
85 |
109 |
163 |
219 |
| 150 |
15.4 |
22 |
42 |
66 |
93 |
120 |
178 |
240 |
| 175 |
16.1 |
23 |
45 |
71 |
100 |
129 |
193 |
259 |
| 200 |
17.5 |
25 |
48 |
76 |
107 |
138 |
206 |
277 |
| 250 |
19.6 |
28 |
54 |
85 |
120 |
154 |
230 |
310 |
| 300 |
21.7 |
31 |
59 |
93 |
131 |
169 |
252 |
340 |
|
