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 The
PMV P5 is a Valve Positioning System from PMV with a modular design
concept. The PMV P5 Valve Control System base unit of the system
is the pneumatic positioner, used in either single or double acting
applications.
PMV P5 Valve Positioning System comes standard with built in dampers,
a 5 mm high gain spool valve assembly, gauge ports and an O-ring
sealed housing. The housing utilizes a unique O-ring seal that
can be adjusted to a sealed or drained position.
 The
modular design concept of the PMV P5 Valve Positioning System
allows for easy addition of accessories such as I/P converter
and/or a feedback package, both which are isolated from the basic
pneumatic unit. These accessories can be factory or field mounted.
Ease of calibration and maintenance are built into to the PMV
P5 Valve Positioning System design with easily accessible span
and zero adjustment, and very simple parts replacement.
Valve Positioning System Function
The PMV P5 Valve Positioning System operates on a force balance
principal. Force is originated by the signal pressure transmitted
through a diaphragm on to the balance arm. The opposing force
is achieved through the feedback spring and is proportional to
the position of the lower arm.
The lower arm position is determined by the position of the cam
which is secured to the spindle and connected to the actuator
shaft thus providing the feedback from the actuator/valve.
When these two forces are equal, the balance arm and the spool
in the pilot valve are in a neutral position -the complete unit
is in a balanced position. Air is supplied to the pilot valve
through port S, and controls the air flow through ports C1 and
C2.
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