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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.
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
STRAINER: Y-type body with 50 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 sys-
tem flushing during start-up. Screen should be
removed and cleaned per normal mainte-
nance schedule (provisions for strainer blow-
down not provided).
9.0
Clean
19.0
Clean
400 250 N/A
GATE VALVE: Manual shut-off valve.
Application — Used for unit isolation during
system flushing, servicing, etc. Do not use for
water balancing.
19.8 36.0 200 200 NO
GLOBE VALVE: Standard pattern, manual
shut-off and throttling valve.
Application — Used for unit isolation. Not rec-
ommended for high flow rates due to relatively
high pressure drop.
1.8 3.9 200 200 NO
COMPRESSION STOP VALVE:
Manual shut-off valve.
Application — Used for unit isolation during
system flushing, servicing, etc. Not recom-
mended for high flow rates due to relatively
high pressure drop.
2.3 5.4 150 200 NO
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 specifica-
tions for service fittings required when used
for water balancing.
4.0 7.5 400 200 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.
4.0 7.5 400 200 N/A
Cv — Coefficient of Velocity
DX — Direct Expansion