News


Wonderware's South African User Group conference attracts leading executives from the US and Europe

March 2000 News

Even in the electronic age many industrial sectors make effective use of diaphragm actuators with pneumatic or electro-pneumatic positioners as standard actuators.

Short floating speed and high control forces are criterions resulting in high efficiency, reliability and especially long duty lives.

ARCA diaphragm actuators have proven themselves in the industry for more than 50 years. Anywhere where robust design, functional safety and a specially favourable ratio of costs and performance are required.

The function

Air power moves the spindle via the diaphragm against the spring tension. In the case of decreasing air pressure the spring acts in the opposite direction. The initial spring tension can be adapted to the process data by means of the spring tensioning screw. The support is connecting the actuator with the control valve. At the same time the stroke indicator is the connection to the valve spindle.

The proven ARCA modular system enables the user to combine all valve types with the UMA-types.

Important advantages

*niversal – The same type is applicable for both control and regulation functions.

*Reversible – For reversing the control action, all that is needed is to loosen four screws, flip the actuator through 180° and tighten the screws again. Planning errors can still be corrected on the spot without any problems. (Swapping normally open for normally closed).

*Strong forces – The strong springs in a solid casing made of high quality aluminium alloy are providing these actuators with control forces of up to 4 t.

*Long duty life – All parts are designed for approximately one million strokes. A special diaphragm allows a maximum operating pressure of 600 kPa.

*Mounting facilities – Provision is made for the optional inclusion of a support (NAMUR) provided for positioner, limit switches, stroke limitations or field controller. Several instruments can be mounted directly.

*Low-priced hand adjustment – For emergency operation of valves, hand adjustment devices can also be mounted subsequently.

p Few spare parts, little maintenance – The restriction to four sizes only means that only a few spare parts need to be stored for emergency cases.

Valve & Automation

(031) 579 2593



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

From the editor's desk: Is additive manufacturing poised to go mainstream?
March 2021, Technews Publishing (SA Instrumentation & Control) , News
As digital manufacturing technology pushes its way further towards the production floor, additive manufacturing (3D printing) is emerging as a viable option to complement the more traditional methods ...

Read more...
Fluid Systems Africa – official Arpol partner for Africa
August 2021, Fluid Systems Africa , News
Fluid Systems Africa has recently been appointed as the official partner of Arpol flexible pipe couplings in Africa.

Read more...
BMG boosts solutions through Heko products
August 2021, Bearing Man Group t/a BMG , News
Through the supply and support of Heko products, BMG has boosted its solutions service to customers wanting to optimise the efficiency of their bulk material conveyor systems.

Read more...
Bosch Rexroth electrifies subsea process automation
August 2021 , News
Bosch Rexroth has engineered a disruptive innovation for electrically actuating valves in the subsea process industry.

Read more...
Endress+Hauser opens vaccination centre
July 2021, Endress+Hauser South Africa , News
As part of a model project, Endress+Hauser is operating a vaccination centre for employees in Maulburg.

Read more...
IS³ accelerates digital transformation through its AVEVA Select partnership
July 2021, IS³ - Industry Software, Solutions & Support , News
IS³ has announced that it has become the first AVEVA Select partner in the EMEA region, making it the only authorised distributor for AVEVA products in southern Africa.

Read more...
Flow Software joins the Eclipse Foundation and Sparkplug Working Group
July 2021 , News
Sparkplug governing body and industry collective welcomes an innovative industrial data analytics and information management software provider to help drive the future of the protocol.

Read more...
IS³ accelerates digital transformation through its AVEVA Select partnership
July 2021, IS³ - Industry Software, Solutions & Support , News
IS³ has announced that it has become the first AVEVA Select partner in the EMEA region, making it the only authorised distributor for AVEVA products in southern Africa.

Read more...
New B2C online shopping platform for engineering consumables
July 2021, Bearing Man Group t/a BMG , News
BMG’s online shopping platform now encompasses a newly launched E-commerce service, designed especially for consumers, to boost their buying experience of engineering consumables.

Read more...
ETG hosts second EtherCAT Interoperability Testing Week
July 2021 , News
After the first EtherCAT Interoperability Testing Week of the EtherCAT Technology Group (ETG) met with a great response, the second event was also very well received.

Read more...