Efficient Plant November 2017 - 26

feature | controlling flow
Fig. 3. Festo points
to these four configurations (valve
assemblies and
combinations of
inputs and outputs)
for pneumatically
actuated control.

Configuration 1
Inputs

Configuration 2

Namur Valve

Outputs

Sensor Box

Sensor Box

Pneumatic
Connections

Compressor

Valve Terminal

| EFFICIENTPLANTMAG.COM

Configuration 4

Namur Valve

running to the actuator. One of the lines will be
pressurized, depending on the desired valve state. This
setup also includes one electrical wire to communicate
the state of the valve. Inventory: one electrical wire and
two controlled pneumatic lines. This system benefits
from short runs of electric and pneumatic lines to a
local control panel.
 Configuration 3 uses only a Namur valve and does
not provide feedback to the controller. This setup
requires one electrical line for control and one connection to the supply air. The advantage of this system is
that it does not require a local controller in a panel. It
does however, require a potentially long run of electrical wire to communicate with the PLC. Inventory: one
electrical wire and one pneumatic connection to the
compressed-air line.
 Configuration 4 uses a valve terminal to control an
actuator and two controlled pneumatic lines from a
cabinet. This design requires only two pneumatic lines
and may be ideal for a hazardous location or in an area
where there are concerns that electrical devices may
be exposed to excessive water. Potential disadvantages include the run of long pneumatic lines if a local

26

Configuration 3

Valve Terminal
controller is not included. Inventory: two controlled
pneumatic lines.
Determining where the control cabinet will be
mounted is critical in each of the four configuration
scenarios, i.e., will it be at risk of overheating or
require positive ventilation?
Different types of enclosures offer different levels of
protection. The cabinet manufacturer will provide a
rating for environmental resistance based on National Electrical Manufacturers Association (NEMA)
standards.

PAYBACK
Understanding the basics of automating valves puts
plant personnel in a better position to operate and
maintain these systems. This knowledge takes some of
the mystery out of automation and ultimately leads to
higher water quality and consistency. EP
For more details on automating water processing
operations and other applications, standardized control
panels, and information on a variety of related support
services, visit festo.com.

NOVEMBER 2017


http://www.festo.com http://www.EFFICIENTPLANTMAG.COM

Table of Contents for the Digital Edition of Efficient Plant November 2017

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