Grinnell Mechanical Products
Installation / Assembly Instructions,
Model CB800 Circuit Balancing Valve
Worldwide
Contacts
www.grinnell.com
Page 1 of 2
AUGUST 2018
G988
IMPORTANT
Refer to Technical Data Sheet
G1100 for warnings pertaining to
regulatory and health information.
General
Description
GRINNELL CB800 Circuit Balancing
Valves are designed for installation in
hot water heating and chilled water
air conditioning systems and serve to
achieve a hydronic balance between
the various circuits of the system.
These installation instructions are
designed for the Grooved, Flanged,
Threaded, and Soldered type Circuit
Balancing Valves.
General Instructions
Always read and understand the
instructions. Never remove any piping
component without verifying that the
system is depressurized and drained.
It is the designer’s responsibility
to select products suitable for the
intended service and to ensure that
pressure ratings and performance data
are not exceeded.
It is recommended that the valve be
installed in the return line.
Install the valve with the flow in the
same direction as the arrow cast in the
body.
Valve must be installed with a minimum
of 3D (3 x nominal pipe diameter) of
straight pipe in the upstream side.
Valve may be installed in the vertical
or horizontal position, with the hand-
wheel up, down or on the side.
Presetting
The required preset value can be
obtained by referencing the flow chart
for the appropriate size of valve. (See
reference documents on www.grinnell.
com) Following the steps below, adjust
the basic and fine adjustment scale on
the handwheel to match the selected
presetting.
Step 1.
The preset value of the valve
is adjusted with the handwheel (Ref.
Figure 1 or 2).
Step 2.
Turn the handwheel so that the
arrow on the sliding indicator matches
the basic adjustment value. One com-
plete turn of the handwheel adjusts the
indicator one full position.
The fine setting is displayed in the scale
under the handwheel and indicates
1/10th of a turn of the handwheel.
Step 3.
With the valve open to the
preset value, use a small screwdriver
and gently pry the cover plug out of the
hand-wheel. Using a 3 mm Allen key for
the 1/2 in. to 2 in., 4 mm Allen key for
the 2-1/2 in. to 6 in., or a 10 mm screw-
driver for the 8 in. to 12 in., insert the
tool into the screw (Ref. Figure 1 or 2)
and turn clockwise until tight. This will
lock the hand-wheel so that the valve
can not be opened beyond the preset
value. The hand-wheel may still be
turned to the closed position. Replace
the cover plug.
Repositioning the
Handwheel
Depending on the position of the valve
in the system, it may be desirable to
move the 1/2 in. to 6 in. handwheel and
adjustment scales to make it easier to
read.
Step 1.
Ensure the valve is closed and
the adjustment scale is set at 0.
Step 2.
Use a small screwdriver and
gently pry the cover plug out of the
hand-wheel.
Step 3.
Use a 12 mm socket for the
1/2 in. to 2 in. handwheel and 6mm
Allen key for the 2-1/2 in. to 6 in. hand-
wheel to remove the Allen screw (Ref.
Figure 1).
Step 4.
Gently pull the handwheel up
and remove it from the valve spindle.
Step 5.
Reposition the handwheel so
that the adjustment scale is visible
and slide the handwheel down on the
spindle.
Step 6.
Replace the screw and tighten.
Step 7.
Replace the cover plug.
Allen Wrench
Handwheel
Indicator
Sliding
Marking
Fine Setting Scale
(Peripheral Scale)
Handwheel
Cover Plug
Screw
Sealing Wire
Hole For
Sealing Wire
Hole For
(Longitudinal Scale)
Basic Setting Scale
1/10th of a turn
Display
Display
complete turns
Lead
seal
Cover
plug
Handwheel
FIGURE 1
1/2 INCH TO 6 INCH
HANDWHEEL PRESETTING AND REPOSITIONING
FIGURE 2
8 INCH TO 12 INCH
HANDWHEEL PRESETTING
AND REPOSITIONING
