75
LEGEND
Table 7 — Piping Components (cont)
SYMBOL/SKETCH DESCRIPTION
C
V
FACTOR RATING
a
STEAM
USE
1/2 3/4 psi F
MODULATING VALVE (Optional)
(Non-Spring Return, Floating Point Actuator):
Modulating valves are designed to control the flow in
the circuit by making incremental adjustments to the
flow path within the valve.
Application — To control fluid flow in fan coil units.
4.0 300 200 N/A
MODULATING VALVE (Optional)
(Non-Spring Return, Proportional Type Actua-
tor): Modulating valves are designed to control the
flow in the circuit by making incremental adjustments
to the flow path within the valve.
Application — To control fluid flow in fan coil units.
4.0 300 200 N/A
MODULATING VALVE (Requires ETO)
(Spring Return): Modulating valves are designed to
control the flow in the circuit by making incremental
adjustments to the flow path within the valve.
Application — Same comments as non-spring return
except when powered, the actuator moves to the
desired position, at the same time tensing the spring
return system. When power is removed for more
than two minutes the spring returns the actuator to
the normal position.
4.0 300 200 N/A
AQUASTAT: Water temperature sensing electrical
switch. (Line Voltage Controls)
Application — Clips directly on nominal size 1/2 in.
or 3/4 in. copper tubing for water temperature sens-
ing. Must be correctly located for proper control
operation.
N/A
CHANGEOVER SENSOR: Water temperature sen-
sor thermistor.
Application — Sensor shall clamp on the outside
diameter of the pipe. Sensor plate shall bend to
allow its radius to be adjusted to fit the pipe. Sensor
shall be secured to the pipe with mounting clamp.
Insulate the mounting location of sensor on the pipe.
N/A
a. Check all system component pressure ratings (coils, values, pumps,etc.) with manufacturer and any applicable local or national piping codes prior to specifying system
pressure rating.
Cv — Coefficient of Velocity
ETO — Engineered to Order
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