Data Sheet

EH and EHA Valves
D100042X012
Product Bulletin
51.2:EH
April 2015
7
maintenance downtime normally associated with
slant configurations. Installation with the stem
vertical above the bonnet also makes trim removal
and installation easy.
Figure 3. NPS 3 Fisher EH Valve with 657 Actuator
W3387
Figure 4. Fisher EHD Valve Body Assembly
W3379-1
n Control Flexibility—Special cage characterization
(standard, Whisper Trim, or Cavitrol trim) can be
supplied to satisfy almost any combination of flow
and noise or cavitation abatement. Cage
characterization and efficient flow passages provide
close control for low flow, high pressure drop
conditions as well as high flow, low pressure drop
conditions. A choice of actuator styles allows wide
selection of power and control capabilities.
NPS 1-1/2 x 1 through 6
Globe Valves NPS 3
through 8 Angle Valves
EH Series valves (figure 3) offer higher capacities,
rugged cage guiding, hardened trim materials, and are
available with special trims for noise attenuation and
cavitation abatement. An EH valve package can be
created for specific service conditions from a variety of
special features, including oversized ends,
intermediate ratings, special trim materials, and
special trim configurations.
Because of flow capacity and severe service
capabilities, both EH and EHA valves are used for many
high-pressure applications in process industries such as
power generation, hydrocarbon production, chemical
processing, and refining. The EHD (figure 4) uses a
balanced valve plug and is well suited for general
applications where extremely tight shutoff is not
required. The EHS (figures 5 and 6) has an unbalanced
valve plug and provides up to Class V shutoff. The EHT
has a balanced valve plug and offers up to Class V
shutoff with process temperatures below 232_C
(450_F).
EHA valves--EHAD, EHAT, and EHAS--are angle versions
of the EH valve.
EH valves are available in CL2500 ratings. EHA valves
are available in CL2500. Because these valves feature a
thicker body wall, both EH and EHA valves are available
with intermediate ratings. See the Features section in
this bulletin.
EHA valves provide many of the same features
available with EH valves. One important feature is the
availability of special trims for aerodynamic noise
attenuation, for cavitating liquid service, and for sour
service.