IM 830-6
32 www.DaikinApplied.com
2-Way Modulating Valve (Steam) - 3/4
"
The modulating control valves for MicroTech are designed to
regulate the flow of steam. They consist of a nickel plated brass
body and stainless steel ball valve and stem, with a spring return,
proportional actuator. The optional valve accessory is shipped
separate from the unit ventilator for field installation to prevent
shipping damage and to provide flexibility in making the field
piping connection.
Figure 56: 2-Way Modulating Valve (Steam) Dimensions
B
A
D
C
F
E
Table 21: Actuator Specifications
Power Supply
24 VAC ± 20%, 50/60 Hz, 24 VDC ± 10%
Electrical Connection
3ft [1m], 18 GA plenum cable with 1/2”
conduit connector
Overload Protection
electronic throughout 0° to 95° rotation
Input Impedance
100 k Ω for 2 to 10 VDC (0.1 mA), 500 Ω
for 4 to 20 mA
Feedback Output U
2 to 10 VDC (max 0.7 mA) for 95°
Angle of Rotation
90°
Position Indication
visual indicator, 0° to 95° (0° is full spring
return position)
Running Time (Motor)
150 sec constant, independent of load
Running Time (Fail-Safe)
<25 sec @ -4°F to 122°F [-20°C to 50°C], <
60 sec @ -22°F [-30°C]"
Ambient Temperature Range
-22°F to 122°F [-30°C to 50°C]
Storage Temperature Range
-40°F to 176°F [-40°C to 80°C]
Table 22: Valve Body Specifications
Service
high temperature hot water/low pressure
steam, up to 60% glycol
Flow Characteristic
A-port equal percentage
Controllable Flow Range
75°
Body Pressure Rating [psi]
600
Max Inlet Pressure (Steam)
15 psi
Media Temperature Range
(Water)
60°F to 266°F [16°C to 130°C]
Media Temperature Range
(Steam)
250°F [120°C]
Maximum Differential Pressure
(Steam)
15 psi
Max Differential Pressure
(Water)
60 psi partially open ball, 116 psi full open
Close-Off Pressure
200 psi
Table 23: 2-Way Modulating Valve 3/4" – Dimensions
Valve Part No.
Cv
Connection Size
(inches)
A
B
C
D
E
F
B220HT731
7.31
3/4 inch
8.70" (221mm)
3.96" (101mm)
6.74" (171mm)
6.07" (154mm)
1.89" (48mm)
1.89" (48mm)
Table 24: 2-Way Modulating Steam Valve 3/4" - Pressure Drop
Pressure Drop Across the Valve
2-Way CCV Part
No.
Cv
Maximum
Rating
Connection
Size
2 PSI
3 PSI
4 PSI
5 PSI
10 PSI
15 PSI
B220HT731
7.31
3/4 inch
110.02
137.27
161.36
183.54
280.70
367.86