Data Sheet

EH and EHA Valves
D100042X012
Product Bulletin
51.2:EH
April 2015
12
Figure 15. NPS 20 Fisher EHD Valve with
Electromechanical Actuator
W4182-1
Figure 16. Custom Design Sequence (NPS 20 Globe
Valves)
A3350
CUSTOMER
SPECIFICATIONS
BASIC
DESIGN
CUSTOM
DESIGN
FINAL
DESIGN
TEST AND
EVALUATION
•FIELD-PROVEN
•SPECIAL
CHARACTERIZATION
•ACTUATOR/VALVE BODY
RESPONSE
•FLOW CAPACITY
•CHARACTERISTIC
•STABILITY
•ULTIMATE RELIABILITY
Custom Design Capability (NPS 20
Globe Valves)
Sliding pressure systems, as well as other control
systems, have specific performance characteristics
that require special control valve constructions. These
special constructions must perform dependably and
provide accurate system operation and plant
reliability.
As shown in figure 16, the basic NPS 20 EHD valve
configuration can be designed to meet customer
specifications. Special cage characterization and
actuator/valve response characteristics can be
designed and then confirmed through exhaustive
testing and evaluation. Flow testing of these large
valves takes place at the Emerson Innovation Center,
Fisher Technology, the largest facility of its kind in the
world.
The final control valve assembly provides reliable,
dependable performance. This performance delivers
controllability for not only the control valve but also
the plant control system, sliding pressure or otherwise.