Description; Specifications - Fisher EWS Series Instruction Manual

Instruction Manual
Form 2376
March 2007
W6825-1/IL
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Management, nor any of their affiliated
entities assumes responsibility for the
selection, use and maintenance of any
product. Responsibility for the
selection, use, and maintenance of any
product remains with the purchaser
and end-user.

Description

These single-port globe-style valves have cage
guiding, clamped seat rings, and push-down-to-close
valve plug action. Valve configurations are as
follows:
Design EWD: Balanced valve plug with
metal-to-metal seating for all general applications
over a wide range of pressure drops and
temperatures.
C-seal trim is available for Design EWD valves,
CL300 and CL600, in sizes NPS 6x4x2.5, 6x4, 8x4,
8x6, 12x6, 10x8, and 12x8.
Figure 2. Cutaway Detail of the WhisperFlor Trim, Valve Body Typical
Note With C-seal trim, a balanced valve can achieve
high-temperature, Class V shutoff. Because the
C-seal plug seal is formed from metal (N07718
nickel alloy) rather than an elastomer, a valve
equipped with the C-seal trim can be applied in
processes with a fluid temperature of up to 593_C
(1100_F), provided other material limits are not
exceeded.
Design EWS: Unbalanced valve plug with
metal-to-metal or optional metal-to-PTFE seating for
all general applications requiring better shutoff
capabilities than can be obtained with the Design
EWD valve.
Design EWT: Balanced valve plug with either
metal-to-PTFE seating (standard for all except
Cavitrol III cages) for stringent shutoff requirements
or metal-to-metal seating (standard for Cavitrol III
cages, optional for all others) for higher
temperatures.
Control valves with WhisperFlo cages (figure 2)
provide additional attenuation for aerodynamic noise
in very demanding vapor or gas applications with
high-pressure drops. A WhisperFlo cage with an
appropriately sized valve body is designed to reduce
the noise level up to –40 dBA. For special
applications, –50 dBA attenuation can be achieved.

Specifications

Typical specifications for these valves are shown in
table 1.
EW Valve
3