The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 1977
Filed:
Aug. 15, 1975
Mituo Takase, Mito, JA;
Hisao Inoue, Hitachi, JA;
Takeo Hachiya, Hitachi, JA;
Katsumi Seno, Hitachi, JA;
Hitachi, Ltd., , JA;
Abstract
There is disclosed a method for starting a pump, wherein when a pump runner effects the idle running in a runner chamber which is filled with compressed air, a water-pumping-up starting instruction is given, then a drain valve is first closed according to the water-pumping-up starting instruction, the aforesaid drain valve being provided in a draft tube for discharging pressurized water from a runner band chamber of the runner chamber; then compressed air in the runner chamber is discharged therefrom; subequently water is charged into the runner chamber; and after water pressure at the adjacent portion of the runner periphery in the runner chamber has been raised to a given level, a by-pass valve and a main valve in a discharge tube and guide vanes are sequentially opened; and a device for automatically substantiating the method.