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

Efficient Plant November 2017 - 1
Efficient Plant November 2017 - Cover1
Efficient Plant November 2017 - Cover2
Efficient Plant November 2017 - 1
Efficient Plant November 2017 - 2
Efficient Plant November 2017 - 3
Efficient Plant November 2017 - 4
Efficient Plant November 2017 - 5
Efficient Plant November 2017 - 6
Efficient Plant November 2017 - 7
Efficient Plant November 2017 - 8
Efficient Plant November 2017 - 9
Efficient Plant November 2017 - 10
Efficient Plant November 2017 - 11
Efficient Plant November 2017 - 12
Efficient Plant November 2017 - 13
Efficient Plant November 2017 - 14
Efficient Plant November 2017 - 15
Efficient Plant November 2017 - 16
Efficient Plant November 2017 - 17
Efficient Plant November 2017 - 18
Efficient Plant November 2017 - 19
Efficient Plant November 2017 - 20
Efficient Plant November 2017 - 21
Efficient Plant November 2017 - 22
Efficient Plant November 2017 - 23
Efficient Plant November 2017 - 24
Efficient Plant November 2017 - 25
Efficient Plant November 2017 - 26
Efficient Plant November 2017 - 27
Efficient Plant November 2017 - 28
Efficient Plant November 2017 - 29
Efficient Plant November 2017 - 30
Efficient Plant November 2017 - 31
Efficient Plant November 2017 - 32
Efficient Plant November 2017 - 33
Efficient Plant November 2017 - 34
Efficient Plant November 2017 - 35
Efficient Plant November 2017 - 36
Efficient Plant November 2017 - 37
Efficient Plant November 2017 - 38
Efficient Plant November 2017 - 39
Efficient Plant November 2017 - 40
Efficient Plant November 2017 - 41
Efficient Plant November 2017 - 42
Efficient Plant November 2017 - 43
Efficient Plant November 2017 - 44
Efficient Plant November 2017 - 45
Efficient Plant November 2017 - 46
Efficient Plant November 2017 - 47
Efficient Plant November 2017 - 48
Efficient Plant November 2017 - 49
Efficient Plant November 2017 - 50
Efficient Plant November 2017 - 51
Efficient Plant November 2017 - 52
Efficient Plant November 2017 - 53
Efficient Plant November 2017 - 54
Efficient Plant November 2017 - 55
Efficient Plant November 2017 - 56
Efficient Plant November 2017 - Cover3
Efficient Plant November 2017 - Cover4
https://www.nxtbook.com/atp/MaintenanceTechnology/epjulyaug2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epjune2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epmay2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epapril2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epfeb2020
https://www.nxtbook.com/atp/MaintenanceTechnology/epjan2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epnovdec2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epseptoct2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epmay2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epapril2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epfebruary2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epjanuary2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epdecember2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epnovember2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epoctober2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epseptember2019
https://www.nxtbook.com/atp/MaintenanceTechnology/epaugust2018
https://www.nxtbook.com/atp/MaintenanceTechnology/0818schneider
https://www.nxtbook.com/atp/MaintenanceTechnology/epjuly2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epjune2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epmay2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epapril2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epmarch2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epfebruary2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epjanuary2018
https://www.nxtbook.com/atp/MaintenanceTechnology/epdecember2017
https://www.nxtbook.com/atp/MaintenanceTechnology/epnovember2017
https://www.nxtbook.com/atp/MaintenanceTechnology/epoctober2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtsept2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtaugust2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjuly2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjune2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtmay2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtapril2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtmarch2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtfebruary2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjanuary2017
https://www.nxtbook.com/atp/MaintenanceTechnology/mtdecember2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtnovember2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtoctober2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtseptember2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtaugust2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjuly2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjune2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtmay2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtapril2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtmarch2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtfebruary2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtjanuary2016
https://www.nxtbook.com/atp/MaintenanceTechnology/mtdecember2015
https://www.nxtbook.com/atp/MaintenanceTechnology/mtnovember2015
https://www.nxtbook.com/atp/MaintenanceTechnology/mtoctober2015
https://www.nxtbook.com/atp/MaintenanceTechnology/mtseptember2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTAugust2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTJuly2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTJune2015
https://www.nxtbook.com/atp/MaintenanceTechnology/M
https://www.nxtbook.com/atp/MaintenanceTechnology/0415endress
https://www.nxtbook.com/atp/MaintenanceTechnology/MTApril2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTMarch2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTFebruary2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTJanuary2015
https://www.nxtbook.com/atp/MaintenanceTechnology/MTDecember2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTNovember2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTOctober2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTSeptember2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTAugust2014
https://www.nxtbook.com/atp/MaintenanceTechnology/MTJuly2014
https://www.nxtbookmedia.com