43
Table 5 — Piping Components (cont)
LEGEND
*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.
SYMBOL/SKETCH
DESCRIPTION
C
V
FACTOR
RATING*
STEAM
USE
1
/
2
3
/
4
PSI
F
BALANCE VALVE: Variable water flow man-
ual balancing valve with screwdriver slot
adjustment screw.
Application — Often used in conjunction with
test port fittings for water flow balancing. Bal-
ance by temperature differential or coil pres-
sure drop (check specifications for service
fittings required if balancing by pressure
drop). May be used in 3-way valve bypass
line to permit equal flow balancing.
4
14
300
250
NO
FIXED FLOW VALVE: Flexible orifice type
(non-adjustable).
Application — Used for water flow balancing.
Valve automatically adjusts the flow to within
10% of set point.
Valve orifice size
determines C
V
fac-
tor. The orifice of
these fixed flow
valves changes as
flow is regulated.
As the water pres-
sure increases,
the orifice size
decreases,
thereby automati-
cally limiting the
flow rate to the
specified gpm
(±10%).
600
220
NO
STRAINER: Y-type body with 20 mesh stain-
less steel screen.
Application — Used for removal of small par-
ticles from system water during normal sys-
tem operation. Should not be used in lieu of
main system strainers. Strainer screen may
have to be removed during initial high pres-
sure system flushing during start-up. Screen
should be removed and cleaned per normal
maintenance schedule (provisions for strainer
blow-down not provided).
9.0
Clean
19.0
Clean
400
150
N/A
BALL VALVE WITH MEMORY STOP:
Manual balance and shut-off valve.
Application — Used for unit isolation and
water flow balancing. The adjustable memory
stop feature allows return to the balance point
after shut-off. Check specifications for
service fittings required when used for water
balancing.
14.2
28.6
600
350
N/A
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 powered open and
closed by spring return when electric power
removed). Manual override lever allows valve
to be placed in the open position for second-
ary (unit) flushing, constant water flow prior to
start-up, etc. Manual override is automatically
disengaged when valve is electrically acti-
vated. Consult factory for normally open
valve applications.
3.5
3.5
300
200
YES
15
PSI
MAX.
a42-4282
C
v
— Coefficient of Velocity
DX
— Direct Expansion
ETO — Engineering to Order
