Sewage pipelines get protection
July 2012
Valves, Actuators & Pump Control
Dynamic Fluid Control has launched the Vent-O-Mat series RGX II, a second generation air-release and vacuum-break valve designed specifically for sewage pipelines. The valve controls air release, protects the pipeline against vacuum and alleviates the effects of potentially damaging surges. An entirely new product, the design of RGX II incorporates market feedback into proven Vent-O-Mat valve technology, itself the result of decades of comprehensive research.
RGX II originated in response to a requirement to overcome the clogging of sewers in the USA, caused by a build-up of grease and fat. To counter this, internal components comprise solid polyethylene floats and dynamic O-ring seals that do not jam or distort ensuring reliable operation over the life of the valve. Rugged design eliminates valve failure, breakage, premature closing, and incomplete venting and the associated pressure shocks common to other sewage air valves. On the outside, a short, compact valve body has been achieved without compromising the pressure rating.
Product development took place over a three-year period, the goal being to design a compact valve that would overcome clogging while maintaining a full bore inlet and outlet, and at the same time incorporate the integral anti-shock device for which Vent-O-Mat is famous. The result is a sewage air release valve with an anti-shock and anti-surge mechanism fitted as standard to protect against damage from the high pressure transients associated with high velocity air discharge. The mechanism automatically reduces the surge caused by liquid column separation and liquid oscillation.
RGX II features full port opening, with large orifice diameters equal to the nominal size of the valve (i.e. 150 mm valve has a 150 mm orifice). This ensures the highest possible intake of air into a draining pipeline, protecting it against premature mechanical fatigue and pipeline collapse.
In operation, the valve protects a pipeline under all conditions, irrespective of the state of the water column within it. The valve is biased towards an anti-surge action, allowing controlled air release through an orifice aerodynamically engineered to throttle air discharge when the velocity of the approaching liquid would otherwise become too great and induce unacceptable pressure rises. This throttling action increases resistance to the flow of the approaching liquid, which subsequently decelerates.
The opposite extreme is when a pipeline experiences liquid column separation due to pump stoppage. Under these conditions, RGX II allows air into the pipeline, but throttles its discharge as the separated column begins to rejoin, reducing the impact velocity and alleviating high surge pressures.
RGX II is offered standard in either 304 or 316 stainless steel with other materials available on request. as well as in any exotic material required by the customer. Model sizes range from 50 to 200 mm.
For more information contact Henry Smith, Dynamic Fluid Control, +27 (0)11 748 0200, [email protected], www.dfc.co.za
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