User Guide

F-27086-7 Copyright 2007 TAC All Rights Reserved. 27
Installation Considerations
Mounting Angle of Valve Assembly
Be sure to allow the necessary clearance around the valve assembly. The valve assembly must be mounted so that the actuator
is horizontally even with, or above, the valve. This ensures that any condensate that forms on the valve body will not travel into
the actuator, where it may cause corrosion or electrical malfunction. See
Vx-2x13-5xx-9-xx Series Ball Valve Assembly
Installation Instructions,
F-27087 or Mx4D-xxxxSeries TAC DuraDrive Rotary Overshaft Actuators General Instructions, F-27170.
Piping
Figure-11 and Figure-12 illustrate 2-way and 3-way ball valve assembly piping.
1
2
2
2
1 Characterized 2-way ball valves
should be piped in the direction
of water flow (labeled with an
arrow on one side of the valve
body). While it is possible to pipe
these ball va
lves in the opposite
direction, doing so will adversely
affect the equal percentage flow
curves.
2 The flats on the sides of the shaft
(or the index mark on top of old-
style shafts) indicate the positi
on
of the ball port.
2-Way
=
Ball Porting
Position
Inlet Outlet
Flats on
Sides of Shaft
Clockwise to Close
New-style Shaft
Old-style Shaft
=
Ball Porting
Position
Index Mark
on Top of Shaft
Inlet Outlet
Clockwise to Close
Figure-11 2-Way Valve Assemblies Piping Diagram.
=
A Full
Open to AB
Index Mark
Pointing to
Port AB
=
B Full
Open to AB
Index Mark
at 90° to
Port AB
1 Fluid enters through two inlets
(ports A and B) and exits through
one outlet (port AB).
2 Not recommended for diverting
applications (one inlet, port AB,
and two outlets, ports A and B).
Using these valves for
diverting
applications will adversely affect
the equal percentage flow curves
and Cv's.
3 The flats on the sides of the
shaft (or the index mark on top of
old-style shafts) indicate the
position of the
ball port.
4 Always pipe the A port to the
outlet of the coil.
1 2
4
3-Way Mixing
Coil
AB A
B
Return
Supply
3
Clockwise to Close A
and Open B
Clockwise to Close A
and Open B
3
Old-style Shaft
=
A Full
Open to AB
Flats Parallel to
Sides of Body
=
B Full
Open to AB
Flats at
90° to Sides
of Body
3
New-style Shaft
Figure-12 3-Way Mixing Valve Assemblies Piping Diagram.