EU and EW Series Valves
Instruction Manual
August 2010
3
Table 2. WhisperFlo Trim Specifications
Trim Material and Selection
J
316 Stainless Steel w/ hardfacing
J
410 Stainless Steel, hardened
J
Others per application
Temperature Capability
J
EUT and EWT: 73 to 316
_
C (100 to 600
_
F)
J
EUT-2 and EWT-2: 73 to 232
_
C
(100 to 450
_
F)
J
EUD and EWD: 29 to 538
_
C (20 to 1000
_
F)
J
Others per application
Maximum Pressure Drops
As shown in this bulletin. Also see Bulletin
80.3:010 WhisperFlo Aerodynamic Attenuation
Trims
WhisperFlo Aerodynamic Trim Pressure
Ratings
(1,2)
Up to 1500 psi drop
Velocity Limits
WhisperFlo trim is designed for 0.3 MACH as an
inherent outlet velocity limit. Variations higher and
lower may be applied per special applications -
consult your Emerson Process Management
sales office
Flow Characteristic
Linear (restricted linear cages and special,
characterized cages are available--consult your
Emerson Process Management sales office)
Rangeability
65:1
High rangeability in excess of 250:1 is available in
some constructions. Contact your Emerson
Process Management sales office for details
Flow Direction
Standard:
Flow up--through the seat ring and out
through the cage orifices
Noise Attenuation
Approximately 40 dBA maximum depending on
the
n
P/P
1
ratio per IEC 60534-8-3 calculation
procedure
1. Other pressures on application.
2. The pressure/temperature limits in this instruction manual and in any applicable standard limitations should not be exceeded.
Description
All valve types covered in this manual (EUD, EUT,
EUT-2, EWD, EWT, and EWT-2 valves) can be used
for either throttling or on-off control of a wide variety
of liquids and gasses. They are single-port,
globe-style valves with cage guiding, balanced valve
plugs, and a push-down-to-close action. EUT, EWT,
and EWT-2 valves have a spring-loaded PTFE seal
between the plug and cage; the EUD and EWD
valves have two graphite piston rings between the
plug and cage. See figure 6 for seal details.
EUT-2 and EWT-2 valves have a seat ring threaded
into the cage. A spring-loaded PTFE seal is used to
seal between the seat ring and the valve body.
Standard seating is metal-to-metal, but optional soft
metal seats are also available. A typical EUT-2 or
EWT-2 valve is shown in figure 7.
EUD and EWD valves have a seat ring bolted into
the valve body with cap screws. Seating is
metal-to-metal. A typical EUD or EWD valve is
shown in figure 8.
EUT and EWT valves have a seat ring bolted into
the valve body with cap screws. These valves have
metal-to-metal seating and use PEEK anti-extrusion
rings in the plug seal arrangement to increase the
upper temperature limit of the seal to 316
_
C
(600
_
F). A typical EUT valve is shown in figure 9.
Cavitrol III, Whisper Trim III, and WhisperFlo trim
cages are available in these valves. Cavitrol trim
helps eliminate cavitation damage in liquid service in
a properly sized valve and Whisper Trim III and
WhisperFlo trim cages help attenuate aerodynamic
noise in gas service.
