User Guide

Technical Instructions Powertop Two-Way Flared Valves Normally Open/Normally Closed
Document No. 155-310P25
May 16, 2005
Page 2 Siemens Industry, Inc.
Table 2. Normally Closed.
Valve
Size
Inch (mm)
Spring
Range
PSI (kPa)
Cv
(Kvs)
Product
Number
.50 (15) 10 to 14 (69 to 97)
1.0 (0.85) 658-0085
2.5 (2.14) 658-0043
Specifications
Line sizes .50 (15)
.75 (20)
1.0 (25)
1.25 (32)
Inches (mm)
Capacity See Tables 3 through 6
Body styles Globe-flared, Angle Union Outlet
Body connections Glob-flared, Angle Union Outlet
Action Normally Open (NO)
Normally Closed (NC)
Stem travel .50-inch (15 mm)
Valve body rating ANSI 250 See Table 7
Material
Body and seat Bronze
Stem Stainless steel
Packing EP rubber
Operating
Controlled medium Water, steam, ethylene glycol solution
Maximum medium temperature 250°F (121°C)
Maximum medium inlet pressure
Water See Table 7
Steam 15 psig (103 kPa)
Maximum recommended differential pressure for modulating service
Water 20 psig (138 kPa)
Steam 15 psig (103 kPa)
Close-off
Normally Open See Figure 1
Normally Closed See Figure 1
Flow characteristic Equal percentage
Actuator
Nominal spring range
NO See Table 1
NC 10 psi to 14 psi (69 kPa to 97 kPa)
See Table 2
Diaphragm
Effective area 11-inch
2
(71 cm
2
)
Ambient temperature range 35°F to 140°F (2°C to 60°C)
Maximum air supply to the diaphragm 30 psig (207 kPa)
Material Silicone rubber