Data Sheet for Product

Technical Instructions Flowrite VF599 Series Three-Way Valves
Document Number 155-160P25 2-1/2 to 6-inch Flanged Iron Body
June 14, 2019
Page 6 Siemens Industry, Inc.
Figure 2. Water Capacity Graph.
Selection Example
Select a valve given:
1 = Required flow = 500 gpm
2 = Desired pressure drop = 5 psi
3 = Select a 5-inch (125 mm) valve, Cv 250.
Table 9. Close-off Pressures for Pneumatic Actuators.
Action
Valve Size
Inches
(mm)
8-inch Actuator
12-inch Actuator
15 psi
(103 kPa)
30 psi
207 kPa)
15 psi
(103 kPa)
30 psi
(207 kPa)
Normally
Open
2-1/2 (65)
31 (213)
100 (689)
95 (655)
304 (2096)
3 (80)
20 (44)
66 (144)
63 (434)
200 (1378)
4 (100)
—
—
40 (275)
129 (889)
5 (125)
—
—
26 (179)
82 (565)
6 (150)
—
—
18 (124)
57 (393)
Normally
Closed
Valve Size
Inches
(mm)
5 to 10 psi (34 to 69 kPa) Spring Range
8-inch Actuator
12-inch Actuator
0 psi (0 kPa)
0 psi (0 kPa)
2-1/2 (65)
36 (248)
114 (786)
3 (80)
23 (158)
74 (510)
4 (100)
—
46 (317)
5 (125)
—
29 (199)
6 (150)
—
20 (137)