Carrier 42D Series - Page 25

25
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 per-
mit 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
automatically limit-
ing 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 parti-
cles from system water during normal system
operation. Should not be used in lieu of main
system strainers. Strainer screen may have to
be removed during initial high pressure 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: Manual balance and shut-off
valve.
Application — Used for unit isolation and water
flow balancing. Without memory stop feature
water balance point must be marked by
installer (if necessary). Check specifications
for service fittings required when used for
water balancing.
14.2 28.6 600 350 YES
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
Cv — Coefficient of Velocity
DX — Direct Expansion
ETO — Engineering to Order
a42-4282