Install Instructions

VEZ-4x Series, 2-Way/3-Way, NPT Zone Control Valves (1/2 to 1") 3 Installation Guide
(A) Allow handle to turn counterclockwise
to extend spindle and close valve (AB-B).
(B) Turn handle clockwise to retract spindle
and open valve (AB-A).
B A
B
A
B
A
(A) Allow handle to turn counterclockwise
to retract spindle and open valve (AB-A).
(B) Turn handle clockwise to extend spindle
and close valve (AB-B).
B A
B
A
Fail-Safe (Spring Return)
Actuator “M” MEP-3503 (NO or Fail AB-A)
Actuator “P” MEP-3504 (NO or Fail AB-A)
Fail-Safe (Spring Return)
Actuator “N” MEP-3501 (NC or Fail AB-B)
Actuator “Q” MEP-3502 (NC or Fail AB-B)
B A
B
A
3 mm
B A
B
A
3 mm
(A) Turn the hex wrench clockwise and the
spindle extends (2-way valve closes).
(B) Turn the hex wrench counterclockwise and the
spindle retracts (2-way valve opens).
Proportional Actuator “B”
MEP-3511
(NC or Fail-in-Place)
Proportional Actuator “A”
MEP-3516
(NO or Fail-in-Place)
(B) Turn the hex wrench clockwise and the
spindle extends (2-way valve closes).
(A) Turn the hex wrench counterclockwise and the
spindle retracts (2-way valve opens).
Tri-State Actuator “F”
MEP-3510
Manual Override
Formanualpositioning,turn o power to the actua-
tor,rotatethemanualoverridehandleclockwise
180°,andsqueezethehandletolatchitaroundthe
protrudingstop.(Theactuatorwillautomatically
unlatchwhenpowerisapplied.)
The“0”and“1”positionsonthehousingarefor
referenceonlyandarenotforstrokemeasurement.
CAUTION
To avoid damaging the actuator, do not manually
assist the spring return as it returns to its home
position.
Two-Position Spring ReturnProportional and Tri-State
Formanualpositioning,turn o power to the actua-
torandusea3mmhexwrenchtorotatetheactuator.
Theactuatorwillmaintainitspositionuntilpoweris
restoredandacontrolsignalisapplied.
Cyclingthepoweroandthenbackonrecalibrates
theactuator.
The“0”and“1”positionsonthehousingarefor
referenceonlyandarenotforstrokemeasurement.