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PRODUCTS HYDRAULICS & PNEUMATICS PUMPS RELIABLY PROCESS CHOCOLATE


In food and beverage applications, leakage prevention, improved reliability and compliance with food safety standards are usually pre-requisites. The VIKING CHC range of cast iron gear pumps, available in the UK from Michael Smith Engineers, meets these requirements. These have a seal modification


which has been developed specifically for pumps used in chocolate processing and other similar applications. The modification features an O-Ring Seal Bushing (OSB), which is effectively a combined bracket bushing and seal gland, with double O-ring seals, housed in a cast-iron cylinder and with back pull-out accessibility. The OSB ring seal has been designed to


fit all the pumps in Viking’s Universal Seal Series with the specific aim of keeping chocolate (and similar foods) from leaking out along the pump shaft. The static O-Ring seals between the OSB and the bracket prevent leakage outside of the OSB, while the area between each


TECHNICAL HYDRAULIC HANDBOOK UPDATED


Lee Products has published Edition 12 of its Technical Hydraulic Handbook catalogue. This 800+ page book includes around 100 pages of engineering reference information to assist engineers in the design and analysis of fluid systems. There are two new sections covering


Combination and Shut-Off Valves and Positive Displacement Pumps, along with 46 additional products, information on custom capabilities and an updated introduction and installation sections. Products featured include: plugs,


restrictors, metering valves, control valves, check valves, pressure relief valves, shuttle valves, combination valves, plus more. A flashdrive with PDF file of the book, with links to the website, is also included.


Lee Products www.leeproducts.co.uk NEW FIVE-WAY SCREW-IN CARTRIDGE VALVE


New from Eaton is the ESVL9 screw-in cartridge valve (SiCV), a five-way, three-position proportional solenoid valve. According to the company, with its patent-pending, integrated load-sense check control, the latest solution provides a 21% manifold size reduction compared to the external checks available with many five-ported directional control valves on the market today. The valve integrates the external check control within the main cartridge for a more efficient package and allows customers to optimise flow forces and improve metering of flow to the spool – providing stable,


20 MARCH 2019 | DESIGN SOLUTIONS


even and manageable proportional control. In addition, the ESVL9 valve was tested in over 30 design cases with CFD analysis, resulting in optimised geometry for advanced engineering and design. The company’s SiCVs come in a variety of pressure and


flow rates, and options that are designed to stand up to the most extreme environments, the company explains.


Eaton www.eaton.com/ProportionalValves 


set of inner and outer rings is filled with food-grade grease to provide lubrication and acts as a double seal barrier to prevent leakage along the shaft. For reliability, Viking focused on the three areas where chocolate solids can build-up and seize a pump – the bracket, the area behind the pump rotor and idler bushing. First, the OSB keeps chocolate out of the bracket;


secondly, the pump


casing features flush and suck back grooves which create


flow behind the pump rotor to help prevent solid product build-up; and third, the CHC Series pumps incorporate a drilled idler gear with hard cast iron bushing and special internal clearances to prevent chocolate caking and build-up as well as reducing burning and binding. The pumps comply with EC 1935/2004.


Michael Smith Engineers www.michael-smith-engineers.co.uk


LOAD DETECTION DEVICE ENABLES WEIGHT MEASUREMENT ON THE GO


Designed to fit easily to the suspension of vans, light trucks and other commercial vehicles, NSK’s hydraulic load detection device enables precise weight measurement on the go. The compact device


features a flexible diaphragm which deforms under load, thus increasing pressure in the fluid chamber. Load is calculated based on the increase in pressure. The hydraulic fluid is essentially non-compressible (high bulk modulus), which serves to facilitate operation with minimal diaphragm flex. A double layer seal to prevent fluid leakage is an integral


part of the design. In the highly unlikely event of a hydraulic fluid leak, the suspension spring will only extend a tiny amount to close a gap above the piston, resulting in no adverse effects on the suspension system. The load detection device also features an ultra-thin (25mm) and compact design to avoid significantly shortening the suspension stroke. The company has already developed a demo car fitted with the


new load detection device, which is attached to the suspension of the front and rear wheels to measure cargo load with an accuracy of ±5%. The device can wirelessly transmit the cargo weight to a mobile phone or on-board system, enabling the vehicle’s centre of gravity to be calculated and utilised accordingly.


NSK www.nskeurope.com PUMP SOLUTIONS FOR THE NUCLEAR INDUSTRY


Sulzer is able to offer specialist technical knowledge and support for all types of pumps, with one of its areas of expertise being the nuclear power sector. The company has, in fact, recently established a service center in Chattanooga, TN, that offers state-of-the-art solutions to the nuclear industry. In a recent project, for example, the company designed and


manufactured a set of six replacement raw water cooling pumps for a nuclear installation. The new pumps had a lower specific speed than the originals, reducing their power requirements, which improved the


margin on the diesel generators. In addition, they met all of the required specifications as well improving performance and reducing vibration. The key to this improvement was understanding the pump curves and how they interact with each


other. Previous issues with original pumps were resolved but, more importantly, the amount of power required from the diesel generators to run the pumps was significantly reduced. This action removed any need to re-rate the generators, which could have cost millions of dollars. Where necessary, Sulzer assumes responsibility for the design, reverse engineering and certification of


pumps and assemblies for most OEMS. Using state-of-the-art data capture tools, laser scanners and precision machine tools, Sulzer can create new components with improved hydraulic performance and extended durability.


Sulzer www.sulzer.com


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