Data Sheet

GX Control Valve and Actuator
D103171X012
Product Bulletin
51.1:GX
March 2012
4
Figure 4. Fisher GX Principle of Operation -- Actuator Air Supply
FAIL-DOWN
FAIL-UP
AIR SUPPLY
AIR SUPPLY
AIR VENT
AIR VENT
The DVC2000 mounting interface is identical on both
sides of the actuator yoke for valve body sizes DN 15
through DN 100 (NPS 1/2 through 4). This symmetrical
design allows the DVC2000 to be easily moved from
onesideofthevalvetotheotherwithouttheneedto
rotate the actuator. The DN 150 (NPS 6) yoke is not
symmetrical.
Linkage-less feedb a ck. The DVC2000 digital valve
controller offers as standard a non-contacting valve
position feedback system. This is a true linkage-less
design, which uses no levers and no touching parts
between the valve stem and the positioner.
Additional Accessory selection. The GX is available
with a v ariety of digital or analog positioners besides
the DVC2000, as well as solenoid and limit switches.
The actuator i s also compatible with the IEC 60534-6-1
(NAMUR) positioner mounting standard.
Principle of Operation
Integrated Air Supply. When mounted with the
DVC2000 digital valve controller, the GX uses an
integrated actuator air supply system. In the fail-down
construction, air is supplied to the lower actuator
casing via a port on the actuator yoke face -- no tubing
is required. In the fail-up configuration, air is supplied
to the upper casing via tubing.