Emerson Fisher EHD, Instruction Manual

Page: 2 / 36

Instruction Manual
D100394X012
EH (1-1/2x1 through 8x6)
July 2017
2
Table 1. Specifications
End Connection Styles
Buttwelding: All available ASME B16.25 schedules
that are compatible with ASME B16.34
pressure/temperature ratings
Flanged: CL2500
J
ring‐type joint (RTJ) or
J
raised‐face (RF) flanges according to ASME B16.5
Socket Welding: Consistent with ASME B16.11
Maximum Inlet Pressure
(1)
Buttwelding: Consistent with CL2500
pressure‐temperature ratings per ASME B16.34
Flanged: Consistent with CL2500
pressure‐temperature ratings per ASME B16.34
Socket Welding: Consistent with CL2500
pressure‐temperature ratings per ASME B16.34
Shutoff Classifications
See table 2
C‐seal trim: High‐temperature, Class V.
See table 3
TSO (Tight Shutoff) trim: See tables 4 and 5
Flow Characteristic
Standard Cage:
J
Equal percentage,
J
modified
equal percentage
(2)
,
J
or linear
Cavitrol ™ III or Whisper Trim ™ III Cage: Linear
Flow Direction
EHD or EHT:
Flow down, except with either a Whisper
Trim III cage or a valve plug with diverter cone, both
of which are flow up
EHS: Flow up, except flow down with Cavitrol III cage
Approximate Weights (Valve Body and Bonnet
Assemblies)
See table 6
Additional Specifications
For specifications such as materials, valve plug
travels, and port, yoke boss, and stem diameters, see
the Parts List section
1. The pressure or temperature limits in this manual and any applicable standard limitations should not be exceeded.
2. Modified equal percentage characteristic is equal‐percentage for the first 90% of travel, then quick‐opening for additional capacity.
Table 2. Shutoff Classifications per ANSI/FCI 70‐2 and IEC 60534‐4
Valve
Valve Size,
NPS
ANSI/FCI Leakage Class
EHD
3x2 II
3, 4x3,
4, 6x4
II—Standard
III—Optional
(1)
6, 8x6
III—Standard
IV—Optional
(1)
EHS w/Cavitrol III, or
EHT w/Cavitrol III
All V
(1)
EHS, EHT,
EHS w/Micro‐Form or
EHS w/Micro Flute
All
IV—Standard
V—Optional
(1)
EHT w/ PEEK Anti‐Extrusion
Rings
3 to 6 V to 600
_
F (316
_
C)
1. O‐ring seat ring construction recommended for this shutoff classification; for temperatures below 232
_
C (450
_
F) only.
Description
The EHD, EHS, and EHT high‐pressure globe valves (figure 1) have metal seats, cage guiding, and push‐down‐to‐close
valve plug action. The EHD and EHT valves use balanced valve plugs.
The EHS valve uses an unbalanced valve plug. To provide a seal between the cage and a balanced valve plug, the EHD
valve plug uses piston rings; the EHT valve plug uses a pressure‐assisted seal ring. A Whisper Trim cage can be used
with an EHD, EHS, or EHT valve plug. A Cavitrol III cage can be used with an EHS or EHT valve plug.
C‐seal trim is available for EHD valves, CL2500, in sizes 4, 6, 6x4, and 8x6.
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