Data Sheet

EH and EHA Valves
D100042X012
Product Bulletin
51.2:EH
April 2015
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Specifications (continued)
Yoke Boss Diameters for Actuator Mounting
See table 19
NPS 8 and 10 CL2500 Valves: 127 mm
(5 inch H
(10)
) yoke boss diameter
All Other Sizes and Ratings: J 127 mm (5 inch H
(10)
) or
J 178 mm (7 inch) yoke boss diameter
NPS 20 Valve: 178 mm (7 inches)
Approximate Weight
See tables 20 and 21
Options
J Flat sheet seat ring gasket constructions
(6)
, J driver
for removing and installing of seat ring retainer, J Class
V shutoff for EHT above 232_C (450_F) to 316_C
(600_F) by using PEEK anti-extrusion rings, J Class V
shutoff for EHD up to 593_C (1100_F) using C-seal trim
or Bore Seal (refer to table 9, J lubricator/isolating
valve for packing lubrication, and J liner with integral
seat ring (EHA Series valves only)
Options for NPS 20 Valve
Tool Kit: Includes tools useful during maintenance [3
sets of lifting eyes, 2 hoist rings, flushing plate with
either J two O-rings for use when flushing fluid is
149°C (300°F) or less or J two silver-plated N04400
gaskets for use when flushing fluid is over 149°C
(300°F), valve stem lifting nut, lapping fixture and
handle, and tamping tools]
Special Cage Characterization: Standard, Cavitrol, or
Whisper Trim cage openings as necessary to provide the
required installed flow characteristic
1. In flow up applications only, NPS 6 to 14 EHD and EHT and NPS 8 EHAD and EHAT valves are available with a diverter cone valve plug construction to provide increased stability for higher
pressure drops. See figures 7 and 12. Diverter cone valve plug construction is also used for NPS 6 EHD and EHT and NPS 8 EHAD and EHAT applications requiring Whisper Trim III Level A, B, or C
cages. Again, for flow up applications only.
2. EN (or other) ratings and end connections can usually be supplied; please consult your Emerson Process Management sales office.
.
3. The pressure or temperature limits in this bulletin and any applicable standard limitations should not be exceeded.
4. Modified equal percentage characteristic is equal-percentage for the first 90% of travel, then quick-opening for additional capacity.
5. EHS may be used for flow down in special cases. Please consult your Emerson Process Management sales office.
NPS 1 and 2 valves with Micro-Form plugs can only be used for flow up
applications
6. O-ring seat ring gasket construction is preferred where temperature allows and is standard for EHT valves. See table 12.
7. For temperatures above 204_C (400_F), the following CF8M (316 SST) valves must be derated: NPS 8 and 10 ASME Special CL1500 or 2500 valves; NPS 12 and 14 ASME Standard or Special
CL2500 valves. For more information, contact your Emerson Process Management sales office.
.
8. NPS 8 to 14 flow up for boiler feedwater service with pressure drop greater than 69 bar (1000 psi) when a diverter plug is used.
9. Valves using an equal percentage cage may be traveled an additional 13 mm (0.5 inch) if desired to obtain additional capacity; flow characteristic becomes modified equal percentage.
10. H indicates heavy actuator-to-body bolting.
Figure 1. Typical HIGH-SEAL Packing System
SPRING
PACKING
PACKING
BOX
STUD
FOLLOWER
W5801-3
Figure 2. Seat Ring Gasket Constructions
W4434-2*
SEAT RING
RETAINER
SEAT
RING
VALVE
BODY
O-RING
LAMINATED
GRAPHITE
GASKET
SEAT RING
RETAINER
SEAT
RING
VALVE
BODY
O-RING GASKET CONSTRUCTION,
STANDARD CONSTRUCTION
FOR EHT, CAVITROL TRIMS,
AND SOUR SERVICE
LAMINATED GRAPHITE
GASKET
CONSTRUCTION
NOTES:
Preferred for all other body constructions where temperature allows.
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