Fisher® EH and EHA Control Valves0 pages

Product Bulletin

EH and EHA Valves

51.2:EH
June 2014

D100042X012

Fisherr EH and EHA Control Valves
EH (globe)
J EHS (NPS 1-1/2x1 through 8x6), J EHD (NPS 2
through 20), and J EHT (NPS 2 through 16x12)

EHA (angle)
J EHAS (NPS 3 through 6), J EHAD (NPS 3 through
8), and J EHAT (NPS 3 through 8)

EH Series Valves
These valves are specially designed for high-pressure
applications. Fisher EH valve configurations
incorporate proven techniques in flow-stream
contouring for higher capacities and in valve trim
design for reliability in severe applications.

X1083

The temperature limits of EHT valves can be extended
above 232_C (450_F) by using PEEK
(PolyEtherEtherKetone) anti-extrusion rings in
combination with a spring-loaded PTFE seal. The PEEK
anti-extrusion rings expand to close off the clearance
gap between the plug and the cage where the PTFE
seal may extrude at high temperatures and pressures.
The temperature limits are extended to 316_C (600_F)
for non-oxidizing service and to 260_C (500_F) for
oxidizing service.
Unless otherwise noted, all NACE references are to
NACE MR0175-2002. Contact Emerson Process
Management for information on NACE MR0175/ISO
15156 or NACE MR0103.

Features

Improved Cage Design–Drilled-hole cages, offering
excellent strength and additional resistance to
destructive vibration, are standard. Special
materials of construction are readily available.

www.Fisher.com

W9768-1

O-ring Seat Ring Gasket Construction–Use of O-ring
construction provides excellent shut-off with
minimal seat ring installation torques for
temperatures up to 232_C (450_F). O-ring