A Novel Valve Concept Including the Valvistor Poppet Valve
2007 (English)In: The Tenth Scandinavian International Conference on Fluid Power / [ed] J. Vilenius and K. T. Koskinen, Tampere, Finland: Tampere University of Technology , 2007, 355-364 p.Conference paper (Refereed)
These days, energy efficient mobile fluid power systems are of great interest. A mobile system containing several different cylinder drives supplied with a single load sensing pump (LS-pump) has a number of advantages as well as disadvantages. One fo the main advantages is the need of only one system pump. This makes the fluid power system compact and cost-effective. A challenge is to keep the hydraulic losses at a low level, especially losses at smaller loads. This paper introduces a fail-safe proportional valve element that is based on the Valvistor poppet valve. Due to the demands of flexibility the poppet valve is bi-directional. The valve has an innovative hydro-mechanic layout that makes it fail-safe, unwanted lowering loads, for example, never occur. The new valve includes simple sensors that are suitable for identificaiton of mode switches, e g between normal, differential and regenerative modes. It is also possible to manoevre the system with maintained velocity control in case of sensor failure. In a less complex system the concept has benefits as well. For example in systems where fail-safe bi-directional on/off valves are needed, then without mode sensing capabilities.
Place, publisher, year, edition, pages
Tampere, Finland: Tampere University of Technology , 2007. 355-364 p.
Fluid power, poppet valve, Valvistor, bi-directional, fail-safe
IdentifiersURN: urn:nbn:se:liu:diva-12539OAI: oai:DiVA.org:liu-12539DiVA: diva2:442
10th Scandinavian International Conference on Fluid Power, SICFP´07, 21st–23rd May, Tampere, Finland