Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1983-06-30
1985-04-16
Schwadron, Martin P.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
1376374, 137508, 417220, F04B 4908
Patent
active
045109621
ABSTRACT:
A precise pressure regulator includes a housing defining a bore having pressure and relief zones, a pressure port communicating with the pressure zone, a relief port communicating with the relief zone, and a control port. A follower is slidable and a spool is rotatable in the bore. The spool defines a first passage for communicating the pressure zone with the control port and a second passage for communicating the control port with the relief zone. A spring biases the follower in one direction tending to block the first passage. Pressure in the pressure zone biases the follower in the opposite direction tending to block the second passage. A step motor rotates the spool in discrete steps to precisely control its position, which position determines the level at which pressure is regulated.
REFERENCES:
patent: 1015415 (1912-01-01), Banner
patent: 2716946 (1955-09-01), Hardy
patent: 2740256 (1956-04-01), O'Malley
patent: 3042061 (1962-07-01), Dobrikin
patent: 3592236 (1971-07-01), Meulendyk
patent: 3782410 (1974-01-01), Steuby
patent: 3834837 (1974-09-01), Nickell
patent: 4035105 (1977-07-01), Dantlgraber
patent: 4342545 (1982-08-01), Schuster
Gallaher Kenneth R.
Mott Philip J.
Borg-Warner Corporation
Schachner Julian
Schwadron Martin P.
Shay James R.
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