4
AB-7489-U
Specifications
For weight, refer to the table shown in the section
Dimensions
.
Valve specifications
Item
Specification
Model
Two-way valve with flanged-end connection, proportional control
Body pressure rating
ANSI Class 125
End connection
ANSI Class 125 bolt pattern flanges, flat face flange (FF)
Size, Cv, Close-off ratings
Note:
Close-off ratings of the actuator in combination
are shown on the right.
Practical close-off rating required for the valve
controlling 347 °F (175 °C) steam is 116 psi.
Model number
Nominal size
Cv
Close-off ratings
Inch
DN
VY51_ _J0021
1"
25
10
145 psi
VY51_ _J0022
1"
25
16
145 psi
VY51_ _J0041
1½"
40
25
145 psi
VY51_ _J0042
1½"
40
40
145 psi
VY51_ _J0051
2"
50
65
145 psi
VY51_ _J0061
2½"
65
95
145 psi
VY51_ _J0081
3"
80
125
145 psi
Materials
Body
Gray cast iron (A126 Class B)
Plug and stem
Stainless steel
Seat ring
Heat-resistant PTFE
Gland packing
Inorganic fiber
Gasket
Non-asbestos joint sheet
Applicable fluid
Chilled/hot water, high temperature water, ethylene glycol solutions, 50%max., Steam
Allowable fluid temperature*
32 °F to 347 °F (0 °C to 175 °C Non-freezing)
Flow characteristics
Equal percentage
Rangeability
100 : 1
Seat leakage
Class IV (0.01% of rated Cv value)
Paint
Gray
Actuator to be combined
Integrated with the valve
Actuator specifications
Item
Specification
Power supply
24 V AC ± 15 %, 50 Hz/60 Hz
Applicable valve size
1" to 3" of standard torque type
Power consumption
12 VA
Timing
63 ± 5 sec (50 Hz) / 53 ± 5 sec (60 Hz)
Control signal input
4 mA DC to 20 mA DC input (Input impedance: 100
W
)
2 V DC to 10 V DC input (Input impedance: 150 k
W
or higher)
Feedback signal output
Range: 4 mA DC (0 % position) to 20 mA DC (100 % position)
Max. load resistance: 500
W
Range: 2 V DC (0 % position) to 10 V DC (100 % position)
Max. load resistance: 10 k
W
or higher (Max. 1 mA)
Materials
Case
Cast aluminum alloy
Top cover, terminal cover
Polycarbonate resin (Color: gray)
Yoke
Steel plate
Surface finishing
Case
None
Yoke
Electro-galvanized (Bright chromate finish)
Valve position indication
Pointer located at the bottom of the actuator shows the position by pointing at the value of
the scale (0: close to 100: open) on front, rear, and bottom sides.
Manual operation
Available
Wires connection
M3.5 screw terminal connection
Enclosure rating
NEMA 4X, IEC IP54
Insulation resistance
Between terminal and case: 5 M
W
or higher at 500 V DC
Dielectric strength
Between terminal and case: 500 V AC/min with 5 mA or less leakage current
