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Water Capacities (See Table 1.)
The suitability of a given regulator size is dependent on the
pressure requirements where it will operate. For the pressure
regulator valve size required for a specific installation,
determine the following:
1. Pressure differential between inlet and outlet pressure
in pounds per square inch (psi),
2. Capacity in gallons per minute (gpm), and
3. Allowable reduced pressure falloff in psi.
Pressure
Reduced
Regulator
Pressure
Valve
Falloff
Flow Capacity
Size
(psi)
1/2 inch
6
10
15
20
3/4 inch
6
10
15
20
1 inch
6
10
15
20
1-1/4 inch
6
10
15
20
a
Velocity in feet per second is based on schedule 40 pipe size. Recommended pressure falloff for general use is approximately 104 kPa
(15 psi). Recommended velocities for the flow of water: Residential and general use, 5 to 10 ft/sec; industrial use, 7 to 15 ft/sec; boiler feed,
7 to 15 ft/sec.
Table 1. Water Capacities.
Pressure Differential Between Inlet and Outlet
25 psi
Velocity
Capacity
a
(US gpm)
(ft/sec)
(US gpm)
7.0
7.3
10.0
10.4
13.0
13.5
15.5
16.0
9.0
5.4
15.0
8.9
20.0
11.9
23.0
13.9
11.5
4.2
20.0
7.2
28.0
10.7
32.0
14.0
13.5
2.9
22.0
4.7
37.0
7.9
55.0
11.8
DS05 DIAL SET PRESSURE REGULATING VALVE
Given these variables, use Table 1 to determine the proper
size pressure regulator valve for your application.
Example: An installation has 135 psi inlet pressure, 60 psi
outlet pressure (75 psi pressure differential). If 12 gpm
capacity is required with only 10 psi falloff allowable, a
1/2 in. DS05 is required.
50 psi
Flow
Flow
Velocity
Capacity
a
(ft/sec)
(US gpm)
8.0
8.3
9.0
11.0
11.5
12.0
15.0
15.6
16.0
18.0
19.5
19.0
10.0
6.0
11.0
16.0
9.5
17.0
22.0
13.7
23.0
26.0
17.6
27.0
13.0
4.7
14.5
21.5
7.8
23.0
30.0
10.9
33.0
37.0
13.5
40.0
16.0
3.4
20.0
29.0
6.2
34.0
56.0
12.0
62.5
78.0
16.7
87.0
3
75 psi
100 psi or more
Flow
Velocity
Capacity
a
(ft/sec)
(US gpm)
9.4
10.0
12.5
13.0
16.7
17.0
21.0
20.0
6.5
12.0
10.0
18.0
13.7
24.0
16.7
28.0
5.3
16.0
8.3
24.5
12.0
35.0
15.5
41.0
4.3
22.0
7.3
38.0
13.4
73.0
18.6
101.0
Velocity
a
(ft/sec)
10.4
13.5
17.7
22.0
7.1
10.7
14.3
17.3
5.8
8.9
12.7
15.0
4.7
8.1
15.6
21.6
62-3041—2
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