Emerson FISHER GX Instruction Manual page 8

GX Valve and Actuator
B: INTEGRAL MOUNTING
PNEUMATIC OUTPUT
PORT (R1/8 PLUG)
A: EXTERNAL PNEUMATIC
OUTPUT PORT (1/4-INCH
NPT OR G1/4 PLUG)
The DVC2000 features linkage-less position
feedback when mounted to the GX control valve.
There are no touching parts between the controller
and the valve stem, which simplifies controller
installation. If maintenance is required, the DVC2000
can be easily removed from the valve.
In the air-to-open (spring-to-close) configuration, the
air signal to the actuator casing is supplied through
the air supply connection on the GX actuator yoke
leg (see figure 15 or 16). In the air-to-close
(spring-to-open) configuration, the air signal is
supplied to the actuator through the air supply
connection on the top of the actuator casing (see
figure 17 or 18).
For an air-to-open construction, a positioner will
mount to the actuator (figure 15 or 16). The air signal
is transmitted to the lower casing through the
pneumatic passageway marked "air supply
connection" in figure 15 or 16.
For an air-to-close construction, DN 15 through
DN 100 (0.5 through 4-inch) size only: in the
actuator design (figure 17 or 18), the pneumatic
signal is connected directly to the air supply
connection in the upper actuator casing. The yoke is
symmetrical and the air passageways serve as a
vent, whereby the DVC2000 positioner can be easily
moved from one side of the valve to the other
without rotating the actuator.
8
FOR AIR-TO-OPEN, INSTALL THE O-RING BEFORE
MOUNTING TO THE GX ACTUATOR
Figure 3. DVC2000 Digital Valve Controller Mounting Details
M8 MOUNTING BOLTS
DVC2000 Mounting Procedures
Steps A and B of the following instructions apply to
the actuator construction shown in figures 15, 16,
17, and 18.
A. Mounting the DVC2000 to an air-to-open GX
actuator (spring-to-close) (see figure 3 and
figure 15 or 16):
1. Attach the magnetic feedback array (supplied
with the DVC2000) to the valve stem connector
using the alignment template (supplied with the
mounting kit) for accurate alignment.
2. Remove the plug (R1/8) from the back of the
DVC2000 housing (Port B in figure 3). This
pneumatic output port on the DVC2000 lines up with
the integral GX actuator air supply connection (see
figure 15 or 16).
3. Install the plug (either G1/4 or 1/4 inch NPT,
included in the mounting kit) to the external output
pneumatic port (Port A in figure 3).
4. Remove the digital valve controller's cover.
5. Using a 6mm hex wrench, attach the digital valve
controller to the GX actuator mounting pad on the
side that has the open pneumatic port. Be sure to
place the O-ring between the digital valve
controller's pneumatic output and the actuator
mounting pad (Port B, as shown in figure 3).
Instruction Manual
Form 5770
June 2006
POLE PIECES