Carrier 42C,V Instalační manuál stáhnout pdf (Strana 63)

Table 7 — 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

FACTOR RATING*

STEAM

USE

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

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: 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.

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

a42-4282

— Coefficient of Velocity

DX — Direct Expansion

ETO — Engineering to Order

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 87 88

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