74
LEGEND
Table 7 — Piping Components (cont)
SYMBOL/SKETCH DESCRIPTION
C
V
FACTOR RATING
a
STEAM
USE
1/2 3/4 psi F
2-WAY MOTORIZED VALVE (25 psi close off differential
pressure): Electric 2-position flow control valve (open/
closed). Normally closed body with manual override lever.
Installed in supply line to unit.
Application — All standard control and valve packages are
based upon normally closed valves (valve electrically pow-
ered open and closed by spring return when electric power
removed). Manual override lever allows valve to be placed in
the open position for secondary (unit) flushing, constant
water flow prior to start-up, etc. Manual override is automati-
cally disengaged when valve is electrically activated. Con-
sult factory for normally open valve applications.
3.5 3.5 300 200
YES
15
psi
MAX.
2-WAY MOTORIZED VALVE (150 psi close off differential
pressure): Electric 2-position flow control valve (open/
closed). Normally closed or normally open body with manual
override lever. Installed in supply line to unit.
4.9 10.3 300 220 NO
3-WAY MOTORIZED VALVE (25 psi close off differential
pressure): Electric 2-position flow control valve (closed to
coil/open to bypass or open to coil/closed to bypass). Nor-
mally closed with manual override lever. Installed in supply
line to unit.
Application — Same comments as 2-way motorized valve
except with manual override lever engaged the valve is open
to both ports and water flow will take the path of least resis-
tance through the valve package (not necessarily 100%
through the coil).
4.0 4.0 300 200 N/A
3-WAY MOTORIZED VALVE (150 psi close off differential
pressure): Electric 2-position flow control valve (closed to
coil/open to bypass for normally closed operation.) Normally
closed with manual override lever. Installed in supply line to
unit.
Application — Same comments as 2-way motorized valve
except with manual override lever engaged the valve is open
to both ports and water flow will take the path of least resis-
tance through the valve package (not necessarily 100%
through the coil).
Consult factory for normally open valves.
4.9 3.3 300 220 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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