User Guide

F-27013-4 © Copyright 2006 TAC All Rights Reserved. 7
Mounting
The Modulating PopTop Series valves can be mounted in horizontal or vertical piping. When
installed in horizontal piping, the actuator must be above the valve body. Refer to Figure-6.
Piping
Refer to the piping diagrams in Figure-7 for two-way valves. For three-way valves refer to
Figure-8.
N O T E
The 3-way is only configured as normally closed. For normally open configuration to the coil
turn valve around. For proportional valves, set the control action (direct or reverse
accordingly).
W
C A U T I O N
• The valve should be used in a closed loop system.
• All valves must be piped so that the plug closes against the direction of flow. For two-way
valves, flow is from port B to port A. For normally closed three-way valves, B is the service
port and A is the bypass port. For normally open three-way valves. A is the service port
and B is the bypass port.
• Three-way VM valves must be piped in a mixing configuration, not diverting.
85
360
Figure-6 Mounting.
Normally Closed
COIL
A
B
Normally Open
COIL
A
B
Figure-7 Two-Way Spring Return Valves.