75
MOORE POSITIONER INSTALLATION AND SERVICE INSTRUCTIONS
The Model 73N (see fig. #) is a Built-in Valve
Positioner which is mounted directly on the
topworks of a valve. It is capable of utilizing the
full force of its air supply to drive the piston or
diaphragm, in a pneumatic actuator, to a position
called for by the control instrument. The positioner
incorporates a single-axis force-balance principle
of operation to insure accurate and stable
positioning of a control valve.
Fast Response: The fast response positioner is
used on actuators with large volume topworks
requiring a fast response action. Due to increased
pilot plunger travel and larger ports in the fast
response positioner, greater filling and exhausting
capacities result. This permits a quicker response
to a change in control conditions, plus increased
speed of valve operation.
Tapped Exhaust: The Model 73N Positioner can
be ordered with a tapped exhaust port. This
feature permits piping of the pilot exhaust to a
safe atmosphere on applications where noxious
gases are used as a control medium instead of air.
USM: On actuators with small topworks and a
low volume, a special hi-response positioner may
be used. This positioner is denoted by the letters
USM in the model number. There is no bleed on
this model due to the low volume. A special valve
plunger is used to ensure fast response for close
control.
GENERAL SPECIFICATIONS
Instrument Input Pressure Range 3-15, 3-9, 9-15, and 3-27 psig
Supply Pressure
Minimum 3 psi above required actuator pressure
Maximum 100 psi
Air Consumption 0.25 SCFM in balance condition with 20 psi supply and 9 psi dead ended output
Valve Travel
Minimum 1/4”
Maximum 4”
Ambient Temperature Limits -40°C to +82°C (-40°F to +180°F)
BASIC MODEL NUMBER
INPUT SPAN - PSIG
SPECIAL FEATURES
F = FAST RESPONSE
R = REVERSE ACTING
E = TAPPED EXHAUST
USM = U.S. ELECTRICAL
MOTORS TYPE
73N
- -
12 F
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