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IM 817-4
2-Way and 3-Way Modulating Valves – MicroTech
II™
Control
Floating Point Modulating
Electrical
20 to 30 VAC at 50/60 Hz or 24 VDC ± 10%
Transformer
12 VA (class 2 power source)
Stroke
29/32 in. (23mm) max. 76 seconds
Spring Return
4 to 9 seconds at room temperature (stem up)
Operating Temperature
35 to 250
o
F (2 to 121
o
C); 15 psig (103 kPa)
saturated steam
The modulating control valves for MicroTech II are designed to regulate
the flow of hot water, chilled water and steam. They consist of a bronze
body valve with a spring return, floating point 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 62 - 2-Way and 3-Way Modulating Valve Actuators
Table 16. Valve Body Specifications
400 psig (2.756 ,PA) up to 150
o
F
Water
(66
o
C) decreasing to 365 psig
Static
(2,515 kPa) at 248
o
F (120
o
C)
Pressure
38 psig (262 kPa) Saturated steam at
Steam
284
o
F
Fluid Temperature
35 to 250
o
F (2 to 121
o
C); 15 psig
(103kPa) saturated steam
Table 15. Actuator Specifications
2-Way Modulating Valve
3-Way Modulating Valve
Valve Size, in. (DN)
A
B C
N.O./N.C./Three Way 2-Way N.O. 2-Way N.C. Three-Way
1/2 (DN15)
3
13/16
1-9/16
1-3/16
8
(76)
(21)
(39)
(46)
(203)
3/4 (DN20)
3-7/32
15/16
1-5/8
2-1/8
8
(81)
(24)
(41)
(54)
(203)
1
4-1/8
1-5/32
1-3/4
2-9/16
9-7/32
(DN25)
(119)
(29)
(44)
(65)
(234)
1-1/4
4-23/32
1-11/32
2
2-25/32
9-7/32
(DN32)
(119)
(34)
(51)
(70)
(234)
2-Way Modulating Valve
3-Way Modulating Valve
Modulating Valve Specifications – MicroTech
II™
Table 17. 2-Way and 3-Way Modulating Valve Dimensions
4-3/32"
(104mm)
3-5/32"
(80mm)
6-13/16"
(173mm)
A
B
C
3-19/32"
(91mm)
11/32"
(8mm)
4-3/32"
(104mm)
3-5/32"
(80mm)
6-13/16"
(173mm)
A
B
C
3-15/16"
(100mm)
11/32"
(8mm)
Figure 63
Figure 64
