# US 5,348,450 A · Bootstrap method of loading a compressor having a spring loaded blowoff valve

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- Number: US 5,348,450 A
- Document ID: US5348450A
- Status: Granted
- Kind: A
- Application number: 08/200,972
- Filed: 1994-02-24
- Granted: 1994-09-20
- Earliest claimed: 1993-06-09
- Assignees: Ingersoll-Rand Company
- Inventors: Daniel T. Martin; William H. Harden, III
- Web page: https://patentgrep.com/patent/US5348450A

## CPC

- F04D 27/02: Surge control {(surge detection F04D27/001)}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

An apparatus for loading a compressor includes a microprocessor based electronic controller, a pneumatically driven, spring loaded open first valve, and a normally open, electrically driven second valve flow connected in series with the first valve. The first valve and the second valve are fluidly disposed intermediate a receiver tank and the compressor. The second valve is disposed in signal receiving relation to the controller. An orifice and muffler combination is flow connected intermediate the first valve and the second valve. The orifice has a predetermined inside diameter dimension suitably sized to establish a pressure signal to close the first valve to thereby load the compressor. During operation, at a predetermined time, the controller closes the second valve thereby directing a predetermined volume of fluid to be compressed through the orifice and muffler combination to cause fluid pressure to rise to a predetermined magnitude, at which time sufficient actuation pressure is available for control of the spring loaded first valve.

## Claims

### Claim 1

An apparatus for loading a compressor, the apparatus comprising:
a microprocessor based electronic controller;
a first, pneumatically driven, spring loaded open valve;
a second, electrically driven valve flow connected in series with the first valve, and disposed in signal receiving relation to the controller; and
an orifice means, flow connected intermediate the first pneumatically driven spring loaded open valve and the second electrically driven valve, for restricting the flow of a compressible fluid to produce a predetermined pressure signal, the orifice means having a predetermined inside diameter dimension suitably sized to produce a pressure signal of sufficient magnitude to close the first valve, at a predetermined time, to thereby load the compressor.

### Claim 2 (depends on 1)

An apparatus, as claimed in claim 1, and wherein the orifice means is an orifice and muffler combination.

### Claim 3

A method of loading a compressor having a spring loaded open first valve, the method comprising the steps of:
consecutively directing a predetermined volume of compressible fluid through the first valve, an orifice means for restricting the flow of a compressible fluid to produce a predetermined pressure signal, and a second electrically driven valve flow connected in series with the first valve;
accelerating a prime mover to a predetermined speed;
electrically closing the second valve; and
directing the predetermined volume of compressible fluid through the orifice means to create a suitable pressure motive force to close the first valve to thereby permit the compressor to load to a predetermined pressure.

### Claim 4

In a compressed air system, an apparatus for loading a compressor, the apparatus comprising:
a microprocessor based electronic controller;
a pneumatically driven, spring loaded open first valve;
a normally open, electrically driven second valve flow connected in series with the first valve, the first valve and the second valve being fluidly disposed intermediate a receiver tank and the compressor, and the second valve being disposed in signal receiving relation to the controller; and
an orifice and muffler combination flow connected intermediate the first valve and the second valve, the orifice having a predetermined inside diameter dimension suitably sized to produce a pressure signal having a predetermined magnitude, and during operation, at a predetermined time, the controller closes the second valve thereby directing a predetermined volume of a compressible fluid through the orifice and muffler combination to cause fluid pressure to rise to a predetermined magnitude, at which time sufficient actuation pressure is available for control of the spring loaded first valve.