Data Sheet

EW Valve
D100023X012
Product Bulletin
51.1:EW
August 2012
10
Table 2. Available Valve Constructions
(1)
VALVE
VALVE SIZE
(2)
,NPS
CL150, 300, or 600 CL900
4x2 6x4 8x4 8x6 10x6
(3)
12x6 10x8 12x8 8x6 12x8
EWD
EWD-1
EWS
EWS-1
EWT
EWT-1
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
---
x
x
x
x
x
x
1. X indicates available construction.
2. Two-number valve size designates end connection size x effective trim size.
3. NPS 10x6 has a valve outlet area identical to the NPS 8x6.
Available Configurations
All configurations covered in this bulletin use a
single-port, globe-style valve body with cage guiding
and push-down-to-close valve plug action. This valve
style is combined with different plug styles and either a
clamped seat ring (no dash number suffix) or a seat
ring threaded into the valve body (-1 suffix).
EWD: Balanced valve plug (figure 1) with clamped seat
ring and metal-to-metal seating for all general
applications over a wide range of pressure drops and
temperatures.
EWD-1: NPS 12x8 CL900 EWD valve body, with
threaded seat ring.
EWS: Unbalanced valve plug (figure 3) with clamped
seat ring and metal-to-metal or optional metal-to-PTFE
seating for all general applications requiring better
shutoff capabilities than can be obtained with the EWD
valve body.
EWS-1: NPS 12x8 CL900 EWS valve body, with
threaded seat ring and metal-to-metal seating.
EWT: Balanced valve plug (figure 2) with metal-to-PTFE
seating (for stringent shutoff requirements) standard
in all EWT valves (except those with Cavitrol III cages).
Metal-to-metalseatingforhighertemperaturesis
standard for all EWT valve bodies with Cavitrol III cages
and optional for these valves with other cages.
EWT-1: NPS 12x8 CL900 EWT valve body, with
threaded seat ring and with metal-to-metal seating
(figure 4).
Material Selection
Guidelines
Regardless of valve construction, select the valve
body/bonnet material from the specifications table,
keeping in mind that the valve service conditions
cannot exceed the ASME pressure/temperature
limitations for the selected valve body. Then, perform
steps 1 and 2 under the appropriate valve design
heading to c omplete the selection process.
EWD, EWS, or EWT Valve With All
Except Cavitrol III or Whisper Trim III
Cages
1. Choose a trim combination for the service
conditions according to figure 7 and 8, while making
sure from tables 1 and 5 that this combination
provides the desired trim materials. Then, make sure
from table 11, 12, or 13 that the valve body/trim
temperature limits are not exceeded.
2. Finally, check in table 20 that packing and other
valve parts are available in materials that meet the
desired service conditions.
EWD-1, EWS-1, or EWT-1 Valve With
Standard Cage
1. Choose a trim combination for the service
conditions according to figure 9, while making sure
from table 7 that this combination provides the
desired trim materials.
2. Finally, check in table 20 that packing and other
valve parts are available in materials that meet the
desired service conditions.