Abstract An air pressure measuring system responsive to pressure between a modulating valve and an air intake of a screw-type air compressor is calibrated in percent of the capacity of the compressor, this air intake pressure varying inversely and linearly with variations in percent of capacity at which the compressor operates. Oil is pumped with the air by the compressor to a receiver-reservoir and then through an oil filter and a cooler back to the compressor. A momentary valve normally connects an oil pressure gauge to the inlet side of the oil filter and, upon manual actuation, connects the oil pressure gauge to the outlet side of the oil filter. A second momentary valve normally connects an air pressure gauge to the receiverreservoir and, upon manual actuation, connects this air pressure gauge to the outlet of an oil separator through which air from the receiver-reservoir passes.
In an improved air compressor system: a variable capacity constant speed, positive displacement compressor means having an intake and an outlet, the compressor means creating a non-pulsating constant volume input flow, flow regulating means for regulating the pressure of air supplied to the intake inversely relative to the output of the compressor means, and indicating means responsive to the pressure of the air being supplied to the intake of the compressor means and calibrated in percent capacity at which the compressor means is operating.
Claim 2
Dependent Claim
84 words
In an improved air compressor system: a variable capacity constant speed, positive displacement compressor means having an intake and an outlet, the compressor means creating a non-pulsating constant volume input flow, flow regulating means for regulating the pressure of air supplied to the intake inversely relative to the output of the compressor means, and indicating means responsive to the pressure of the air being supplied to the intake of the compressor means and calibrated in percent capacity at which the compressor means is operating.
Claim 3
Dependent Claim
17 words
The improved air compressor system of claim 1 wherein the indicating means is an air pressure gauge.
Claim 4
Dependent Claim
18 words
The improved air compressor system of claim 2 wherein the compressor means is a constant speed screw-type pump.
Claim 5
Dependent Claim
28 words
The improved air compressor system of claim 3 wherein the flow regulating means is a valve responsive to pressure of air at the output of the compressor means.
Claim 6
Dependent Claim
47 words
The improved air compressor system of claim 1 wherein the indicating means comprises pressure to voltage transducing means sensing pressure at the intake of the compressor means and voltage responsive means having an indicator calibrated in percent capacity of the compressor means actuated by the transducing means.