Emerson Fisher DFA Інструкція з експлуатації - Сторінка 2
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DFA Desuperheater
August 2013
Table 1. Specifications
Available Configurations
J DFA valve body style: Angle
Common Characteristics: Designed according to ASME
B16.34 Valve-Flanges, Threaded and Welding End
(1)
End Connections Styles
See tables 2 and 3
Maximum Inlet Pressure and Temperature
Flanged, Socketwelding, or Buttwelding: Consistent
with CL150, 300, 600, 900, 1500, and 2500 according
to ASME B16.34, unless limited by maximum pressure
drop or material temperature capabilities
Maximum Pressure Drop
Valve with Cavitrol™ III Cage: 149 bar (2160 psi) for
two-stage and 207 bar (3000 psi) for three-stage cage.
Consult Fisher Bulletin 80.2:030, Cavitrol III One-, Two-,
and Three-Stage trims, for more information
Anti-cavitation MicroFlat: <51.7 bard (<750 psid)
Inherent Rangeability
Up to 50:1. The ratio of maximum to minimum
controllable C
is dependent upon the available water
v
pressure differential
Spray Water Pressure Required
6.9 bar (100 psi) or larger is acceptable
1. Do not exceed the pressure or temperature limits in this bulletin, nor any applicable code or standard limitations.
2. EN (or other valve body material) ratings and end connections can usually be supplied; consult your Emerson Process Management sales office.
3. A function of required turndown and equipment selection.
4. Special characterized cages are available. Contact your Emerson Process Management sales office.
5. Modified equal percentage characteristic is equal percentage for the first 75% of travel, then opens quickly for additional capacity.
The DFA features:
1. Fine atomization over a wide range of operating conditions helping to assure rapid and complete vaporization of
injected water.
2. Available with a wide range of standard and anti-cavitation trim styles.
3. Design minimizes affects of thermal cycling.
4. High turndown capability.
5. Flexible architecture with multiple valve trim combinations and face-to-face dimensions available.
2
(1)
and Valve Sizes
(1,2)
(1)
(3)
Shutoff Classifications per ANSI/FCI 70-2 and IEC
60534-4
Class V only
Material Temperature Capabilities
Up to 593_C (1100_F) depending on construction
(4)
Flow Characteristics
Standard Cages: J Linear, J equal percentage,
J modified equal percentage
Cavitrol III: Linear
Micro-Flat: Linear
Flow Direction
Standard Cage (Micro-Flat): Flow down
Cavitrol III Cage: Flow down
Bonnet Style and Mounting
Standard Bonnet
Yoke Temperature Limit: Standard bonnet with cast iron
yoke is limited to 537_C (1000_F)
Packing Arrangements
J Single, J Double, and J Leakoff standard graphite
packing, or optional J ENVIRO-SEAL™ and
J HIGH-SEAL packing systems. See bulletin 59.1:061,
ENVIRO-SEAL and HIGH-SEAL Packing System for
Sliding-Stem Valves
Approximate Weight
See table 12
Instruction Manual
D103643X012
(1)
(5)
(1)