Rotary pneumatic actuators
February 2006
Valves, Actuators & Pump Control
Spirax Mitech's Pneumatic Rotary Actuators feature a choice of mechanisms between crank arm and scotch yoke designs. The crank arm is suitable for modulating control and provides high run torques, low friction and negligible backlash. The scotch yoke provides greater torque in the end positions making it well suited for most on/off duties. The actuators are easy to assemble and disassemble due to their single spring design. Various sizes are available, and to assist with easy selection, a sizing program is available.
Their square drives permit the actuators to be mounted perpendicular to, or in-line with the pipework. The devices are field reversible from clockwise-to-close to clockwise-to-open permitting base mounting of the actuator, irrespective of valve type and fail action.
When the units are operating with a double acting fail action, all the power available is at the shaft, as torque output. Fail action on the double acting actuator can be obtained by the use of a volume tank and switching valve arrangement. These double acting types are compact, powerful and relatively inexpensive.
All units have simple 'O' ring pressure seals to reduce maintenance costs, and the adjustable end stops allow the end position to be externally adjusted in both open and closed position to ±5°. Provision has been made to allow either a pneumatic or electro-pneumatic positioner to be mounted with Namur mounting making it easier to convert for modulating duty. Torque outputs of 250 000 Nm have been achieved with double acting and 56 000 Nm for spring return units.
For more information contact Richard Ransome, Spirax Mitech, 011 708 2497, [email protected]
Further reading:
High-flow solenoid valve
Emerson Automation Solutions
Valves, Actuators & Pump Control
Emerson has introduced the new ASCO Series 327C solenoid valve, which features a direct-acting, high-flow design that provides superior flow-to-power ratio. It permits high flows at minimum power levels, making it ideal for use in power plants, refineries, and chemical processing facilities.
Read more...
Proportional cartridge valve series is the fastest in its class
Valves, Actuators & Pump Control
Parker Hannifin is introducing the enhanced version of the proportional cartridge throttle valve series, TFP. The new pilot valve further reduces the step response times by up to 30%, making the TFP the fastest valve in its class.
Read more...
Proportional cartridge valve series is the fastest in its class
Valves, Actuators & Pump Control
Parker Hannifin is introducing the enhanced version of the proportional cartridge throttle valve series, TFP. The new pilot valve further reduces the step response times by up to 30%, making the TFP the fastest valve in its class.
Read more...
Inspection system for leak detection in valves in hazardous areas
Extech Safety Systems
Valves, Actuators & Pump Control
Leaking valves in industrial plants not only lead to loss, safety risks and possible contamination and pollution, but also result in high economic costs. Therefore, valves in hazardous areas require regular proper inspection and preventive maintenance to ensure their functionality.
Read more...
Control head for automation of hygienic process valves
Burkert South Africa
Valves, Actuators & Pump Control
Burkert’s Type 8681 control head is optimised for decentralised automation of hygienic process valves. Thanks to its universal adapter, it can be combined with all normal commercial butterfly valves, ball valves and single- and double-seated valves.
Read more...
Hydroformed tube valve body
Burkert South Africa
Valves, Actuators & Pump Control
One of the most common necessities for manufacturing pharmaceuticals, cosmetics, food and beverages are diaphragm valves. What used to be a dull two-way race between forged and cast body variants is now being challenged by an exciting, ground-breaking technology. The hydroformed, light-weight diaphragm tube valve body will change the way you think about plant design and operation.
Read more...
Global pumping giant ready to support hydrogen economy
Valves, Actuators & Pump Control
With abundant sunshine and wind, southern Africa is perfectly positioned to become a global powerhouse in green hydrogen production. Two key projects are already in advanced stages of development in Namibia. KSB has identified the vast potential of these types of projects in southern Africa, and through its KSB Pumps and Valves subsidiaries in Namibia and South Africa is investing heavily in bringing the right skills to the region.
Read more...
Compact valve position indicator
Emerson Automation Solutions
Valves, Actuators & Pump Control
Emerson’s new TopWorx DVR Switchbox is an entry-level addition to the DV Series of valve position indicators. It combines a durable resin enclosure, compact size, and a patented cam design that provides a reliable valve position feedback for water and wastewater systems, food and beverage production lines, and industrial utilities.
Read more...
Precision, control and performance in regulators and control valves
Valve & Automation
Valves, Actuators & Pump Control
Cashco has long been a trusted name in industrial control solutions, offering a broad range of regulators and control valves designed to meet the rigorous demands of various industries. There are two key Cashco product lines, its regulators and the Ranger QCT control valve.
Read more...
Advanced solutions for valves
Bearing Man Group t/a BMG
Valves, Actuators & Pump Control
BMG delivers state-of-the-art valve solutions to diverse industries across Africa, in collaboration with InterApp, a global leader in the design and manufacture of high-quality valves.
Read more...
printer friendly version