Owner's manual

VEZ-41/44 Series, 2-Way/3-Way, NPT, Pneumatic Zone Control Valves 2 Installation Guide
Diverting
Asthevalvestemmovesdownward,theow
throughVCZ-44portsAB-Adecreasesandtheow
throughportsAB-Bincreases.Asthevalvestem
movesupward,theowthroughportsAB-Ain-
creasesandtheowthroughportsAB-Bdecreases.If
thereisalossofsignalpressure,theactuatorreturns
the valve to its normal position—the valve fails with
ow to port A.
Mixing
Thethree-wayVCZ-44zonevalvesarediverting
valves.However,theymaybeusedasmixingvalves
whenconnectedinthereturnowasshowninthe
diagrambelowandifsystemanddierentialpres-
suresarewithinthegrayareaofthechartbelow.
+
Bypass Coil
Three-Way Valve in Return Flow
B
AB A
Pressure
(See
Chart)
COM
A
B
AB
14.5 (100)
11.6 (80)
20.3 (140)
17.4 (120)
8.7 (60)
5.8 (40)
4.3 (30)
94 (650)
2.9 (20)
14.5
(100)
29
(200)
43.5
(300)
58
(400)
72.5
(500)
87
(600)
101.5
(700)
116
(800)
130.5
(900)
System Pressure in psi (kPa)
Differential Pressure in psi (kPa)
Allowable Mixing Applications
3-Way Valve Applications
Connection
Connectthemainairsupply(30psimax.)tothe1/8"
NPTportonthetopoftheactuator.
1/8" NPT
Air Connection
Ring Nut to
Valve Body
1
2
Mounting Actuator on Valve Body
REMOVE Black
Plastic Attachment
Support Ring
if Present