printer friendly version
AS-i positioner simplifies valve installation
February 2017, Valves, Actuators & Pump Control
One of Schubert & Salzer’s goals in developing an AS interface was to make installation fast, reliable and easy while keeping connection costs low. This innovative bus system at the actuator-sensor level has proved highly popular, especially in drinks sector technology. An AS-i-based system makes it very easy to install, start up and reliably monitor modular-built plants in particular. Schubert & Salzer has therefore incorporated AS-i networking technology into its new 8049 digital positioner to exploit the key benefits of AS-i into their actuating and control valves, namely:
• Reduction in cabling cost and effort.
• Significantly fewer sources of faults.
• Simpler installation and commissioning.
The digital AS-i positioner for actuating pneumatic control valves is linked to the master by means of the characteristic yellow, twin-conductor AS-i cable, whose dual function is to supply power while simultaneously transmitting data.
By developing the 8049 AS-i positioner in a so-called “top-mounted” configuration in which it rests centrally over the valve actuator and does not have to be linked via an actuating lever on the side, this design provides very high hygiene standards and is ideally suited for integration into food and drink process technology. For reasons of operating reliability and hygiene, on-site operation has been reduced to a minimum and is limited to self-balancing and to adjustment of the positioner setting locally. This is all that is required since the 8049 digital positioner can be configured very easily for the tasks in question via the AS-i connection, a PC interface and a user-friendly GUI. Furthermore, AS-i permits the use of remote diagnostic tools to interrogate the status of the equipment at the control valve and to access any error messages. Diagnosis through the Internet is possible also, and the AS-i structures can be seamlessly embedded in other bus structures through appropriate gateways.
The benefits of the AS-i positioner can be combined with different actuating and control valves to provide individual modular process solutions. Examples of this can be found in the processing technologies in the brewing and drinks industries, where the 6020 hygienic control valves, the 6021 aseptic control valves and the sliding gate valves can be used with the digital AS interface positioning system.
The 6020 hygienic control valve is a self-draining right angled valve and is made from solid, non-porous stainless steel. Precision turning, polishing, fine polishing or electro polishing are used to achieve the surface quality required by the particular process. The 6021 aseptic control valve has a completely smooth diaphragm to provide a complete separation between the processing region and the piston rod. Both the 6020 as well as the 6021 valve ranges are offered in the nominal sizes DN 15, 25 and 40 up to a PN 16 pressure level. Sliding gate valves are precision devices used for liquid, vapourphase and gaseous media in many adjacent areas in brewing and drinks process engineering. Sizes in this case range from DN 15 to DN 200 for pressures up to PN 100 and media temperatures from -60 to 350°C.
For more information contact Rowan Blomquist, Macsteel Fluid Control, +27 (0)11 383 4000, firstname.lastname@example.org, www.macsteel.co.za
- Single-use diaphragm valves simplify biotech manufacturing
June 2017, Gemü Valves Africa, Valves, Actuators & Pump Control
Automated controllable valve systems increase process reliability.
- Valve solutions for biomass plants
June 2017, Macsteel Fluid Control, Valves, Actuators & Pump Control
Sliding gate valves open up enhanced flexibility for power plant planners and operators.
- Ticona solves tricky situation with ball sector valve
May 2017, Macsteel Fluid Control, Valves, Actuators & Pump Control
When an expensive control valve breaks down after three months only, a remedy is needed badly. But resin producer Ticona had to live with this situation for a considerable time due to its extraordinary ...
- New cost-competitive positioner
Africa Automation Fair 2017 Preview, Metso South Africa, Valves, Actuators & Pump Control
The new single-acting NDX positioner is very cost-competitive. It is easy to use and features many new functionalities. Visit Stands E40-E41 to find out more about its key characteristics, which include ...
- The Beck advantage
Africa Automation Fair 2017 Preview, Limit Africa, Valves, Actuators & Pump Control
Beck damper drives and valve actuators have superior control, high reliability, and outstanding low maintenance durability. These unique electric actuators combine the positioning necessary for optimum ...
- Robust globe control valves and actuators
Africa Automation Fair 2017 Preview, Spirax Sarco South Africa, Valves, Actuators & Pump Control
Spirax Sarco’s comprehensive range of robust globe control valves and actuators is designed for use with steam, water, oils and most industrial fluids. Visit Stand D29 to view the Spira-trol valve, which ...
- Ball sector valve proves itself in slurry applications
April 2017, Macsteel Fluid Control, Valves, Actuators & Pump Control
Ball sector valves from Schubert & Salzer excel in abrasive slurry applications.
- Energas supplies HFO storage facility
April 2017, Valves, Actuators & Pump Control
Energas Technologies was commissioned by DRA Global to design a High Fuel Oil (HFO) storage facility for the Elandsfontein phosphate mining project in the Western Cape. Elandsfontein is home to the biggest ...
- A guide to testing control valve positioners
April 2017, Comtest, Valves, Actuators & Pump Control
Valves, the actuators that move them, and the electronic circuits that control them, are all subject to ageing after they are installed. Valve seats wear from repeated seating and from the liquid or gas ...
- Small cause big effect
March 2017, Gemü Valves Africa, Valves, Actuators & Pump Control
Choosing the right valve technology in control applications.
- Valve technology without stress
February 2017, Gemü Valves Africa, Valves, Actuators & Pump Control
Gemü Valves Africa offers safe and cost effective solutions.
- Periodic valve testing eliminates downtime
February 2017, AT Technical Services & Supplies, Valves, Actuators & Pump Control
Although plant designers tend to treat them as ‘necessary evils’, it is obvious that control valves play a key role in process quality and reliability. Extreme care must be taken to avoid costly premature ...