WEFTEC is recognized as the world’s largest annual water quality technical conference and exhibition, providing extensive educational opportunities and unparalleled access to the field’s most cutting-edge technologies and services.

WEFTEC's expansive show floor provides unparalleled access to the most cutting-edge technologies in the field; serves as a forum for domestic and international business opportunities; and promotes invaluable peer-to-peer networking among registrants.

The conference provides insights and products for water and wastewater technologies including:
  • Collection Systems - Management, operations and maintenance, infrastructure, overflow reduction, wet weather planning, watershed approaches, and regulations
  • Energy Conservation and Management - Resource recovery, combined heat and power, biogas optimization
  • Membrane Technologies - Application in wastewater and water reuse, innovations, enhanced performance, regulatory compliance
  • Plant Operations and Treatment - Innovations, technologies, processes, and proven solutions in water and wastewater treatment; including nutrient removal and odor control
  • Regulations - CMOM/SSO Rules, TMDL/Watershed Rules, Nutrient Trading, and NPDES Phase II
  • Research - Leading edge process applications in water and wastewater treatment and recent developments
  • Residuals & Biosolids - Incineration, disposal, reuse through land application, research, regulations, politics, and public perception
  • Stormwater - Treatment, green infrastructure, wet weather management, modeling
  • Utility Management - Asset Management and financial planning for infrastructure, technology, regulatory compliance, and security; including environmental management systems (EMS)
  • Water Reuse/Recycling - Research, regulations, emerging technologies, proven processes
  • Water Quality & Watershed Management - Stormwater, wet weather, and watershed issues
Kinetrol is exhibiting again this year and will be in booth 4136. Please come by and visit us if you attend.

Exhibition Details:
McCormick Place | Chicago, IL
Exhibition: October 2 - 4, 2017
Hours: 8:30 am - 5:00 pm daily

This is a Great Chance to See the New Blueline Actuator for Food and Beverage Processing

Get a free pass to the PROCESS EXPO 2017 courtesy of Kinetrol USA!

September 19–22, 2017 • McCormick Place • Chicago, IL USA 

PROCESS EXPO is the nation’s largest trade show dedicated to bringing the latest technology and integrated solutions to all segments of the food and beverage industry.

Kinetrol is featuring the new Blueline Actuator series specifically for the food and beverage industry. Kinetrol Blueline Rotary Vane Actuators provide a superior alternative for actuating quarter-turn valves in food and beverage applications and are guaranteed for up to 4 million operations.

Stop by the Kinetrol booth #2670 and see the difference!

Instructions for your free pass: Visit this link and fill in your information. Or, go to the PROCESS EXPO 2017 site and use code 74768 when registering.

Control Valve Positioner and Control Valve Actuator Basics

Control Valve Loop
Control Valve Loop*
Control valves control fluid in a pipe by varying the orifice size through which the fluid flows. Control valves contain three major components, the valve body, the positioner, and the valve actuator.

The valve body provides the fluid connections and movable restrictor comprised a valve stem and plug that is in contact with the fluid that varies the flow.

The valve actuator is the component that physically moves the restrictor to vary the fluid flow.

Their are two general categories of control valves - linear and rotary. Three actuator types are used in linear control valves including spring and diaphragm, solenoid, and motor operated. Three actuator types are used in rotary control valves including pneumatic, electric, and electro-hydraulic. Rotary actuators are sometimes referred to as "quarter-turn" or "partial-turn".
Pneumatic positioner on rotary vane actuator
Pneumatic positioner with
rotary vane actuator
on ball valve.

The valve disc (restrictor) controls flow through the valve body. A positioner receives information from a supervisory controller advising wether or not the flow condition is satisfactory. The positioner then provides a signal to the actuator that provides the force to open and close the valve.

Each type of positioner works in response to a process signal. Some positioners (linear) use a 3-15 PSI pneumatic process signal. The pressure is exerted on a large diaphragm creating downward force that is applied against a spring which moves the restrictor up and own. Other types of positioners use a 3-15 PSI pneumatic signal to regulate a higher supply pressure (such as 0-60 PSI) to move pistons or vanes back and forth (rotary). 

The variable 3-15 PSI control signal can be provided directly by a pneumatic controller connected directly to the process, or in other cases the 3-15 PSI is regulated by an electropneumatic device called an I/P or E/P (current to pressure or voltage to pressure) transmitter. These transmitters receive their signal from a supervisory control as a 0-10VDC or 4-20mA and then throttle the 3-15 PSI output to open/close the valve. 

* Image courtesy of Tony R. Kuphaldt from "Lessons In Industrial Instrumentation"

Pneumatic Actuators that Stand Up to Pulp and Paper Plants

Pulp and Paper Process
Simplified Pulp and Paper Process Diagram
The "kraft process" (also known as the sulfate process) is the method to convert wood chips into pulp and then to cellulose fibers. This is done by mixing the wood chips with sodium hydroxide and sodium sulphate, soaking, cooking and processing. One reason why the kraft process dominates the paper industry is because of the ability of the kraft chemical recovery process to recover approximately 95 percent of the pulping chemicals and at the same time produce energy in the form of steam.

The purpose of the chemical recovery cycle is to recover cooking liquor chemicals from spent cooking liquor. The process involves concentrating black liquor, combusting organic compounds, reducing inorganic compounds, and reconstituting cooking liquor.

Pulp and Paper Process
Chemical recovery process flow diagram.
Green liquor is created when molten inorganic salts, referred to as "smelt," collect in a char bed at the bottom of the furnace. Smelt is drawn off and  dissolved in weak wash water to form a solution of carbonate salts - known as green liquor - which is primarily Na2S and Na2CO3. Green liquor also contains insoluble unburned carbon and inorganic Impurities, called dregs, which are removed in a series of clarification tanks.

Decanted green liquor is transferred to the causticizing area, where the Na2CO3 is converted to NaOH by the addition of lime (calcium oxide [Ca0]). The green liquor is first transferred to a slaker tank, where Ca0 from the lime kiln reacts with water to form calcium hydroxide (Ca(OH)2). From the slake, liquor flows through a series of agitated tanks, referred to as causticizers, that allow the causticizing reaction to go to completion (i.e., Ca(OH)2 reacts with Na2CO3 to form NaOH and CaCO3).

On the right you see a Kinetrol model 14 double acting actuator on a 8” full-port ball valve on a green liquor line. The valve cycles 2 times per day to direct green liquor flow and weak wash (weak white liquor) alternatively from one pipe to another in order to prevent solids build up in the pipelines.

Equipment used to produce pulp, paper, and paperboard is exposed to a wide range of temperature and humidity conditions, and contaminants. Actuators used in Pulp and Paper manufacturing processes must withstand the most difficult operating conditions.  Kinetrol actuators are preferred in these situations because they don't allow corrosive atmospheres to penetrate the actuator or springs, their long cycle life,  and their epoxy stove enamel finish.

Contact the experts at Kinetrol USA at 972-447-9443 to discuss any pulp and paper mill actuator application.