A Novel Valve Concept Including the Valvistor Poppet Valve
2008 (English)In: Ventil : revija za fluidno tehniko in avtomatizacijo, ISSN 1318-7279, Vol. 14, no 5, 433-442 p.Article in journal (Other academic) Published
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 of 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 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-mechanical layout that makes it fail-safe, unwanted lowering loads, for example, never occur. The new valve includes simple sensors that are suitable for identification of mode switches, e g between normal, differential and regenerative modes. It is also possible to maneuver the system with maintainted velocity control in the 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
2008. Vol. 14, no 5, 433-442 p.
fluid power, poppet valve, Valvistor, bi-directional, fail-safe
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-43301Local ID: 73431OAI: oai:DiVA.org:liu-43301DiVA: diva2:264160