Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1990-12-28
1991-08-27
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
417 62, F04B 2304
Patent
active
050425218
ABSTRACT:
A piston and a plurality of passages (first to fourth or fifth passages) are provided in a cylinder for reciprocation, which piston has a recessed portion formed in the central part thereof, so that the suction system of two suction pumps can automatically be switched between a parallel coupling and a series coupling depending on the piston's position in the cylinder. The pressure in a pressure chamber provided adjacently to the cylinder is changed by means of a pilot valve provided so as to operate when the negative pressure of the pumps become a predetermined value, and the piston is moved between its first and second positions by means of a diaphragm which constitutes a part enclosure of the pressure chamber and deforms in response to the change of the pressure in the pressure chamber, thereby the suction system is switched from parallel to series or vice versa.
REFERENCES:
patent: 2255560 (1944-09-01), Fieber
patent: 2377556 (1985-06-01), Jeanin
patent: 2904012 (1959-09-01), Hager
patent: 4718832 (1988-01-01), Takahashi
Cohan Alan
Nitto Kohki Co. Ltd.
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