Reference Manual

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Figure 1-10. Fisher Control-Disk Valve with 2052 Actuator and FIELDVUE DVC6200 Digital Valve Controller
W9425 W9418
WAFER STYLE SINGLE FLANGE STYLE
D Bodies are available in sizes through NPS 24
compatible with standard ASME flanges.
D Utilize standard pneumatic diaphragm or
piston rotary actuators.
D Standard flow direction is dependent upon
seal design; reverse flow results in reduced
capacity.
Control-Disk Valve
The Control-Diskt valve (figure 1-10) offers
excellent throttling performance, while maintaining
the size (face-to-face) of a traditional butterfly
valve. The Control-Disk valve is first in class in
controllability, rangeability, and tight shutoff, and it
is designed to meet worldwide standards.
D Utilizes a contoured edge and unique
patented disk to provide an improved control range
of 15 - 70% of valve travel. Traditional butterfly
valves are typically limited to 25% - 50% control
range.
D Includes a tested valve sealing design,
available in both metal and soft seats, to provide
an unmatched cycle life while still maintaining
excellent shutoff
D Spring loaded shaft positions disk against the
inboard bearing nearest the actuator allowing for
the disk to close in the same position in the seal,
and allows for either horizontal or vertical
mounting.
D Complimenting actuator comes in three,
compact sizes, has nested springs and a patented
Figure 1-11. Rotary-Shaft Control Valve
with V-Notch Ball
W8172-2
lever design to increase torque range within each
actuator size.
V-notch Ball Control Valve
This construction is similar to a conventional ball
valve, but with patented, contoured V-notch in the
ball (figure 1-11). The V-notch produces an
equal-percentage flow characteristic. These
control valves provide precise rangeability, control,
and tight shutoff.
D Straight-through flow design produces little
pressure drop.
D Bodies are suited to provide control of
erosive or viscous fluids, paper stock, or other
slurries containing entrained solids or fibers.