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Advanced Engineering 2020

NEC, Birmingham(B40 1NT)

04/11/2020 - 05/11/2020

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Drives & Controls Exhibition

NEC, Birmingham(B40 1NT)

25/01/2021 - 27/01/2021

The show brings together key suppliers of state-of-the-art equipment representing the multi-tasking culture (more)

Taking sides on suction and return filtration

The increasing use of suction and return filtration for use in mobile hydraulic systems used in industries including warehousing, transport, construction and agriculture has divided manufacturers and end users into two groups; those for and those against its use. While those in favour of the technology focus on its ability to improve cold start performance and reduce the cost of ownership of hydraulic systems, those preferring conventional filtration methods claim that it poses problems such as high running temperatures, the possibility of a vacuum forming in suction lines, and the danger of oil foaming, preventing the use of suction and return systems from being a viable option. In comparison, a suction and return filtration system can be designed so that the return oil from a working hydraulic system and the suction oil of a closed loop hydrostatic drive circuit can be filtered by a single unit. Filtered oil is made available under pressurisation to the hydrostatic drive due to a specially designed back-pressure valve in the filter, significantly reducing operating costs and, provided the filter is correctly specified, improving the overall efficiency of the filtration system and at the same time reducing maintenance requirements. A distinct benefit of suction and return filtration is the potential to reduce the volume of oil required, as the working hydraulic circuit and the hydrostatic drive are connected via the filter. In many applications this allows smaller and irregularly shaped tanks to be used, reducing the space required and, where tanks are mounted externally, allowing the aesthetics of the equipment to be enhanced. Despite often unjustified criticism, suction and return filters provide a straightforward method of reducing the construction and maintenance costs associated with hydraulic systems used in mobile applications. A number of the perceived problems associated with the technology can be overcome by correctly specifying and fitting filters, significantly improving system reliability, service life and performance in the process.

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