Unloader valve having bypass valving means

Details Unloader valve having bypass valving means Unloader valve having bypass valving means

1981-05-07

1983-08-02

Coe, Philip R.

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

Responsive to moving member developed fluid force, current...

415 29, F01B 2500

Patent

active

043963455

ABSTRACT:
The invention comprises incorporating in the wall of a typical unloader valve for a compressor, a normally-closed, pressure-responsive valve for admitting product compressed air therethrough, into the valve chamber, for re-circulation of the admitted air through the compressor. In the first embodiment illustrated, a pilot air pressure, which modulates the unloader valve throttling piston, is also addressed to a passageway which opens onto the normally-closed valve. When the pilot air pressure is substantially elevated, the normally-closed valve opens.

REFERENCES:
patent: 1421308 (1922-06-01), Redfield
patent: 1925610 (1933-09-01), Shinn
patent: 2323927 (1943-07-01), Mercier
patent: 2374822 (1945-05-01), LeClair
patent: 2705501 (1955-04-01), Fritzsch
patent: 2722946 (1955-11-01), Mueller
patent: 2876788 (1959-03-01), Shube
patent: 3180088 (1965-04-01), Swain
patent: 3439579 (1969-04-01), Guinot

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