Data Sheet

GX Control Valve and Actuator
D103171X012
Product Bulletin
51.1:GX
March 2012
3
Figure 2. Fisher GX and DVC2000 Digital Valve
Controller
LINKAGE-LESS
POSITION
FEEDBACK
PUSH-BUTTON
INSTRUMENT
SETUP
W8588
DVC2000
COVER
Stable flow control. The flow cavity of the GX valve
body has been engineered to provide s table flow and
reduce process variability.
Live-loaded packing. The GX comes with live-loaded
PTFE V-ring packing as standard. The live-loaded
design helps to seal your process to conserve valuable
process fluid, while reducing emissions to the
environment. The long-life and high reliability of the
live-loaded system also reduces maintenance costs
and process downtime. For applications exceeding
232_C(450_F), live-loaded ULF (Ultra Low Friction)
graphite packing and extension bonnets are available
for all sizes except DN150.
Easy maintenance. Thesimplescrewedseat-ring and
one-piece plug and stem design provide easy
maintenance. Design simplicity and parts
commonality contribute to reduced spares inventory.
The integrated DVC2000 digital valve controller allows
easy instrument removal, without a requirement for
tubing disconnection or replacement (fail-down
construction).
Long life. Alloy valve constructions and hardened trim
materials are available in the GX to increase valve
body, bonnet, and trim life.
Figure 3. Fisher GX Cryogenic Valve
W9343
Cryogenic offering. The GX is available in a low
temperatureconstruction(seefigure3).Thecompact
design maintains high performance in low
temperature applications, while minimizing overall
envelope size.
Digital valve controller. The GX is available with the
DVC2000 digital valve controller. The DVC2000 is easy
to use, compact, and designed for easy mounting. It
converts a 4-20 mA input signal into a pneumatic
output signal, which feeds the control valve actuator.
Instrument setup is performed with a push button and
liquid crystal display (LCD) interface. This interface is
protected from the environment within a sealed
enclosure. The i nterface supports multiple languages,
including G erman, French, Italian, Spanish, Chinese,
Japanese, Portuguese, Russian, Polish, Czech, Arabic,
and English.
Intrinsic safety and non-incendive construction is
available to CSA, FM, ATEX, and IEC standards. An
optional module provides integrated limit switches
and a position transmitter.
Integrated mounting. The DVC2000 digital valve
controller integrally mounts to the GX actuator,
eliminating the need for mounting brackets. The
DVC2000 transmits a pneumatic signal to the actuator
casing via an air passage in the yoke leg, causing the
valve to stroke (see figure 4). This eliminates the need
for positioner-to-actuator tubing in the fail-down
configuration.