Title: Hydraulic modulator valve

Abstract: Disclosed herein is a hydraulic modulator valve for a control system of a hydraulically operated mechanism having a casing with a bore therein, a stepped spool axially and slidably engaged within the bore to form an annular fluid throttle passage against the circumference of the bore between a first and a second ports drilled through the casing, and spool actuator for controlling axial displacement of the spool. The stepped spool comprises a large diameter portion to be hermetically engaged within the bore, a small diameter portion and a medium diameter portion in sequence, the throttle passage being formed by the bore and the medium and small portions of the spool.

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Inventors: Murakami, Noboru (Nagoya, JA)
Hirozawa, Koichiro (Kariya, JA)
Takahashi, Shigeo (Hekinan, JA)

Application Number: 496263
Filing Date: 1974-08-09
Publication_date: 1976-03-30
Assignee: Aisin Seiki Kabushiki Kaisha (Kariya, JA)
Primary Class(es): 138/31 60/413, 91/447, 91/468, 138/46, 192/109F, 251/120
Other Classes:
US Patent Ref:

1871287	Aug, 1932	Whittaker	138/46.
2384394	Sep, 1945	Patton	138/43.
2402729	Jun, 1946	Buchanan	138/43.
3174505	Mar, 1965	Bauer	137/505.
3213874	Oct, 1965	Schmiel et al.	91/447.
3216444	Nov, 1965	Herner	91/443.
3583422	Oct, 1968	Dach et al.	192/109.
3656600	Apr, 1972	Kitano et al.	192/109.

Other Refs: 1,221,119

Feb, 1971	UK

Primary Examiner: Cohen, Irwin C.
Assistant Examiner:
Attorney: Berman, Aisenberg & Platt