Data Sheet

EH and EHA Valves
D100042X012
Product Bulletin
51.2:EH
April 2015
2
construction is standard on EHT valves. The flat
sheet seat ring gasket construction is available for
elevated design temperatures and/or NACE
constructions where a suitable O-ring material is
not available.
n Increased Pressure/Temperature Ratings—Steel EH
and EHA valves with buttwelding end connections
have Intermediate Standard Ratings. With
nondestructive testing, these valves can conform to
ASME Intermediate Special Ratings, which allow
even higher pressure/temperature applications. See
table 7 for specific ratings.
n Long Trim Life—Hardened materials of construction
for the cage, valve plug, cage guiding, and other
trim parts are standard for all applications,
providing excellent wear resistance. In all
applications, rugged cage guiding provides
increased valve plug stability. Increased stability
results in reduced vibration and other mechanical
stresses, which contributes to long trim life.
n Piping Economy—The availability of expanded end
connections on EH valves may eliminate the need
for line swages while accommodating oversized
piping arrangements.
n Control of Low Flow Rates/Tight Shut-off—
Micro-Form or Micro-Flute valve plugs (figure 5 or 6)
provide superb rangeability in high-pressure,
low-flow applications. A choice of several restricted
port diameters helps match valve capacity to
required flow, helps provide necessary control with
full travel, and helps prevent throttling near the
seat.
For EHA valves only, and in low-flow applications where
cavitation damage may occur, the Micro-Flat style
valve plug can be used. For low-flow applications
where cavitation damage may occur and the minimum
required C
v
is equal to or greater than 0.05, Cavitrol III
with Micro-Flat trim can be used in both EH and EHA
valves. Please contact your Emerson Process
Management sales office. for more information.
For soot-blower applications, a special trim design is
available to address noise, vibration, tight shutoff, and
thermal cycling which is seen in this application. Please
contact your Emerson Process Management sales
office. for more information.
n High-Temperature, Class V Shutoff—Use of the
metal C-seal (see figure 17) permits Class V shutoff
up to 593_C (1100_F) for up to 4-3/8 inch port in
CL2500 rated valves and 5-3/8 inch port in CL1500
rated valves. The metal Bore Seal will permit Class V
shutoff up 593_C (1100_F) for 5-3/8 inch ports and
larger.
n Excellent Stem Sealing—HIGH-SEAL packing systems
provide excellent sealing to conserve valuable or
hazardous process fluid and to protect against the
emission of hazardous or polluting fluids to
atmosphere. This system (figure 1) features
graphite packing material and heavy-duty live
loading.
n High Capacity—Careful consideration of
aerodynamic and hydrodynamic principles in the
design of the flow stream passages results in 30 to
40 percent higher capacity than conventional valves
with comparable port sizes and travels.
(continued on page 6)
Table of Contents
EH Series Valves 1..............................
Features 1.....................................
Specifications 3................................
NPS 1-1/2 x 1 through 6 Globe Valves, NPS 3
through 8 Angle Valves 7......................
Trims (NPS 1-1/2 x 1 through 6 Globe Valves 8......
NPS 8 through 14 Globe Valves 9..................
Principle of Operation
(NPS 8 through 14 Globe Valves) 10.............
NPS 20 Globe Valves 11.........................
Custom Design Capability (NPS 20 Globe Valves) 12..
C-seal Trim Description 13.......................
Bore Seal Description 14.........................
Fisher TSO (Tight Shutoff) Trim Capabilities 15......
Trim Selection Guidelines 18.....................
Material Selection Guidelines 19..................
Pressure/Temperature Limits 26..................
Installation 29.................................
Dimensions 30.................................