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Table 5 — Piping Components
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.
NOTES:
1. Motorized 2-way valves have a maximum close-off differential
of 25 psi.
2. Motorized 3-way valves have a maximum close-off differential
of 10 psi.
SYMBOL/SKETCH DESCRIPTION
C
V
FACTOR RATING*
STEAM
USE
1
/
2
in.
3
/
4
in. 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 ball-
check and quick vent feature via knurled vent
screw.
Application — Optional replacement for man-
ual 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 subse-
quent 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 tub-
ing joints for best joint integrity.
N/A N/A 300 200 YES
UNION: Combination wrought copper/cast
brass union assembly, solder by solder.
Application — Used for quick connect (and dis-
connect) of valve package components to min-
imize field labor and facilitate servicing of unit.
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 bal-
ancing and service analysis.
N/A N/A 250 250 NO
Cv — Coefficient of Velocity
DX — Direct Expansion