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PIPING COMPONENTS
SYMBOL/SKETCH DESCRIPTION
C
V
FACTOR RATING
STEAM
USE
1
⁄
2
3
⁄
4
PSI F
MANUAL AIR VENT: Threaded brass
needle valve with screwdriver slot
for adjustment.
Application - Body brazed into high
point of heating and cooling coils for
bleeding air from coil. Standard item
on all hydronic coils (not used on
steam or DX coils). Should not be used
in lieu of main system air vents.
N/A N/A 400 100 NO
AUTOMATIC AIR VENT: Nickel
plated brass valve, fiber-disc type, with
positive shut-off ballcheck and quick
vent feature via knurled vent screw.
Application - Optional replacement for
manual air vent. Automatically passes
minute quantities of air through the
fiber discs which expand upon contact
with water, completely sealing the
valve. As air accumulates, the fiber
discs dry and shrink, repeating the
cycle. Not recommended for removing
large quantities of air encountered
during initial start-up or subsequent
draining and refilling. Should not be
used in lieu of main system air vents.
N/A N/A 125 240 NO
SWAGE: Copper tube end expanded
to accept a copper tube of the same
size for factory or field brazing.
Application - Used where possible for
all tubing joints for best joint integrity.
(*) See page 30 for ratings of different
joining materials and operating
temperatures.
N/A N/A
300
(*)
200
(*)
YES
UNION: Combination wrought
copper/cast brass union assembly,
solder by solder.
Application - Used for quick connect
(and disconnect) of valve package
components to minimize field labor
and facilitate servicing of unit.
(*) See page 30 for ratings of different
joining materials and operating
temperatures.
N/A N/A
300
(*)
200
(*)
YES
INSERTION TEST PORT: Brass body
valve for acceptance of test probe (up
to
1
⁄
8
in. diameter).
Application - Installed on one (or both)
sides of the coil to allow for temperature
or pressure sensing. Used for close
tolerance water balancing and
service analysis.
N/A N/A 250 250 NO
24