| 摘要 |
PURPOSE:To reduce energy consumption by providing elastic lead pieces for closing fixed nozzles when a nozzle flapper is in the neutral stationary state on the free end of the nozzle flapper and disposing a feedback spring between the nozzle flapper and a valve element end portion. CONSTITUTION:Elastic lead pieces 20a, 20b are provided at the free end of a nozzle flapper 16, and a supply fixed nozzle 24 and a discharge fixed nozzle 26 are disposed opposite to the elastic lead pieces 20a, 20b, wherein when the nozzle flapper 16 is in the neutral stationary state, both fixed nozzles 24, 26 are closed by the elastic lead pieces 20a, 20b, A feedback spring 54 is disposed between the nozzle flapper 16 and the end portion of a valve element 34. In this arrangement, while the nozzle flapper 16 is in the neutral stationary state, pressure fluid will now flow, so that energy consumption of a pump can be remarkably reduced. |
