Hydraulic booster device

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Details

F15B 910

Patent

active

060530898

ABSTRACT:
In this invention, an idea is adopted in which the pressure at a forward portion and a backward portion of valve device is steppingly dropped twice. The valve device of the present invention includes, on the axis of a spool 600, a first valve 710 located nearer an inlet port and a second valve 720 located nearer an outlet port. A throttling area made by the second valve 720 is larger than a throttling area made by the first valve 710. For example, of all the pressure difference equal to 120 kg/cm.sup.2 or more required at the forward and backward portions of the valve device, a portion in the range where the problem of an occurrence of a foreign noise is not encountered (for example, a portion ranging from 100 to 120 kg/cm.sup.2) is undertaken by the first valve 710, and the remaining portion ranging from 20 to 30 kg/cm.sup.2 is undertaken by the second valve 720. By doing so, there can be eliminated such a pressure difference where a generation of a noise before and after an actual throttling (including a primary throttling made by the first valve 710 and a secondary throttling made by the second valve 720) can become a problem.

REFERENCES:
patent: 3747475 (1973-07-01), Runkle
patent: 3967538 (1976-07-01), Thomas
patent: 4135435 (1979-01-01), Adachi
patent: 4172411 (1979-10-01), Matsuda et al.
patent: 4196592 (1980-04-01), Nomura et al.
patent: 4294160 (1981-10-01), Ideta et al.
patent: 4338855 (1982-07-01), Ideta
patent: 4598545 (1986-07-01), Harada

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