TECHNOLOGY IN ACTION ADVERTORIAL
Innovative Pressure Relief Valve design concept reduces superimposed backpressure
B
rownell Limited has developed Deluge Valve, the latest extended range of ultra high flow performance pressure relief valves suitable for low pressure differentials. The valve covers a range of pressure setting that goes from 0.5 to 5 psi and it is available in three standard sizes 1’’, 3’’ and 8’’. Pressure relief valves represent the last chance to prevent a disaster; therefore they must be reliable and functioning constantly and in every condition. The Deluge Valve can operate in aggressive environments at low and high temperature and in conditions of driving rain. In addition, the material, of which the valve is made, must be compatible with the fluid contained in the storage vessel in order to prevent chemical reactions between the valve and its content. Deluge valves can withstand corrosive chemicals and can be manufactured in different materials, such as aluminium alloy, brass and stainless steel, in accordance with the specific requirements of the customer. The Deluge Valve uses a simple but innovative design concept. Pressure valves often employ springs as loading
devices. However, a variation on the layout of the springs within a deluge valve allowed a considerable decrease in superimposed backpressure immediately after the valve opens. This entails an overall decrease in pressure differential and an increase in air flow compared to equivalent conventional valves.
This graph shows the results of a test conducted on a valve which had the crack point at 0.4 psid, corresponding to the design-lift pressure.
The unusual operating characteristic of the Deluge Valve can be seen from the trend of the graph. The Deluge Valve does not open to the maximum extent until the pressure exceeds the pressure at the toggle point (maximum opening operating conditions). When the toggle point is reached, the Deluge Valve is fully open. At this stage, the pressure differential in the Deluge Valve starts reducing to a value close to the crack pressure. After the pressure differential reached this minimum value, this quantity began increasing again. Beyond the toggle pressure, the Deluge Valve is able to offer a considerably lower pressure differential combined with high venting performance. The Deluge Valve is designed for those situations in which, the safety requirements impose tight constraints on the maximum allowable pressure which in the majority of the applications has been identified as the parameter that has to be monitored.
Brownell Ltd
u 020 8965 9281
u
www.brownell.co.uk
Greater scope for the interior configuration of enclosures S
pace is precious when it comes to high packing densities in electrical engineering. Space limitations mean that panel builders and switchgear manufacturers have to accommodate more and more mechanical and electrical components in enclosures. Now, a smart new enclosure accessory from Rittal can provide far greater scope for the interior configuration of compact enclosures. The planning and configuration of interior installations within compact enclosures can be both time-consuming and complicated. It can also lead to actions which compromise the integrity of the enclosure and add to the cost of installation. Additional holes often have to be drilled in areas such as theside panels to fasten components outside of the mounting plate. This not only lowers the enclosure’s protection category, it is also adds significantly to the setting-up costs. The limited available installation space inside the enclosure can also cause problems around the best use of the existing mounting surfaces. In response, Rittal has developed an interior installation rail. The rail can be easily mounted to the side, floor or roof areas of the AE compact enclosure, without any need for additional drilling through the enclosure panels. This neat solution saves time and preserves the enclosure’s protection
category. It can be placed wherever it is needed in the enclosure and is easily fixed (with a screw) and it will support static loads of up to 100 N. A door- operated switch can also be fitted to the rail using an adapter (supplied). This means that rail mounting is easy even if the mounting plate has already been installed. The rail has two rows of system punchings to create an additional mounting surface for items such as punched sections, enclosure lights, the afore-mentioned door-operated switches, door stays, cable conduit holders and a range of other components. Use of the rail can easily double the available mounting surface inside an AE compact enclosure. And because it has also been designed to use the accessories for the tried-and-tested modular TS 8 enclosure system, there is no longer any need to keep a duplicate stock of accessories.
Rittal Ltd u 01709 704000 u
www.rittal.co.uk
/ DESIGNSOLUTIONS DESIGN SOLUTIONS | MAY 2016 41
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