Fluid handling – Systems – Multi-way valve unit
Patent
1989-09-01
1991-07-02
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13759615, 13759616, F15B 13043
Patent
active
050278584
ABSTRACT:
Two and three stage servovalves having a first stage comprising a torque-motor driven, double jet, flapper valve, extend the present art in dynamic response through the replacement of the present flapper valve inlet orifices with active flow controllers. The flow controllers hold the flow rate from the pressure supply substantially constant under varying supply pressure and under varying operating conditions of the flapper valve and of the second and third stages. The flow controllers increase the gain of differential pressure to flapper displacement, through which the flapper to nozzle null gap can be reduced which, in turn, further increases the gain of differential pressure to flapper displacement and reduces the total flapper stroke. The stroke reduction reduces the torque-motor centering spring force, through which the torque-motor limited differential pressure can be increased. These factors significantly extend the operating supply pressure range and extend the frequency band of second and third stages of multistage servovalves.
REFERENCES:
patent: 2832318 (1958-04-01), Paine
patent: 2880708 (1959-04-01), Hayner
patent: 3621862 (1971-11-01), Wojtecki
patent: 3794060 (1974-02-01), Perkins
patent: 3799498 (1974-03-01), Wickham et al.
patent: 4623003 (1986-11-01), Leonard
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