Fluid handling – Systems – Multi-way valve unit
Patent
1984-07-02
1986-03-25
Schwadron, Martin P.
Fluid handling
Systems
Multi-way valve unit
13762521, 13762532, 91375A, 180148, F15B 910, F62D 5083, F16K 11083
Patent
active
045776601
ABSTRACT:
A rotary servovalve includes a valve sleeve and a rotor relatively rotatably fitted therein, and includes a pressure control section composed of lands angularly spaced from each other when the servovalve is in a neutral condition and a pressure characteristic adjusting section composed of lands disposed in overlapping relation to each other when the servovalve is in the neutral condition. The lands of the pressure control section have first chamfers for gradually reducing the area of communication between fluid supply and discharge passages as the valve sleeve and the rotor are relatively turned, and the lands of the pressure characteristic adjusting section have second and third chamfers for gradually increasing and then gradually reducing the area of communication between the fluid supply and discharge passages as the valve sleeve and the rotor are relatively turned. The second and third chamfers, and the first chamfers are effectively combined for pressure control to provide desired valving characteristics.
REFERENCES:
patent: 4310024 (1982-01-01), Bacardit
patent: 4335745 (1982-06-01), Bouveret et al.
patent: 4335749 (1982-06-01), Walter
patent: 4353288 (1982-10-01), Holub
patent: 4452274 (1984-06-01), Haga et al.
patent: 4460016 (1984-07-01), Haga et al.
patent: 4465098 (1984-08-01), Bacardit
Haga Kyosuke
Tanaka Tsuneo
Schwadron Martin P.
Starsiak Jr. John S.
Toyoda Koki Kabushiki Kaisha
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