Honeywell DIAL-SET DS05C Product Data page 3

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, and
3. Allowable reduced pressure falloff in psi.
Reduced
Pressure Pressure
Regulator Falloff
Valve 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
Flow
Velocity
Capacity
a
(US gpm) (ft/sec) (US gpm)
1.2 1.3 2.3
8.8 9.3 10.1
13.2 13.9 15.0
17.6 18.6 20.7
3.6 2.1 4.0
8.1 4.9 9.3
14.7 8.8 17.6
23.0 13.8 27.7
5.7 2.1 5.9
13.2 4.9 15.4
19.6 7.3 24.6
25.7 9.6 32.1
13.5 2.6 16.0
22.0 4.7 29.0
37.0 7.9 56.0
55.0 11.8 78.0
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 a 12 gpm
capacity is required with only 10 psi falloff allowable, a 1/2 in.
DS05 is required.
50 psi
Flow
Velocity
Capacity Capacity
a
(ft/sec) (US gpm)
2.4 3.3
10.7 10.6
15.8 17.6
21.9 22.0
2.4 4.0
5.6 9.9
10.6 19.8
16.7 32.1
2.2 5.9
5.7 15.7
9.1 18.6
11.9 37.6
3.4 20.0
6.2 34.0
12.0 62.5
16.7 87.0
3
75 psi 100 psi or more
Flow Flow
Velocity
Capacity
a
(ft/sec) (US gpm)
3.5 4.4
11.2 10.6
18.6 17.6
23.2 22.9
2.4 4.0
6.0 9.9
11.9 20.6
19.3 4.1
2.2 6.3
5.8 16.4
10.6 31.7
14.0 43.6
4.3 22.0
7.3 38.0
13.4 73.0
18.6 101.0
DS05C,D,G
Velocity
a
(ft/sec)
4.6
11.2
18.6
24.2
2.4
6.0
12.4
20.5
2.4
6.1
10.8
16.2
4.7
8.1
15.6
21.6
62-3041—4