Boots – shoes – and leggings
Patent
1988-09-13
1990-12-25
Gruber, Felix D.
Boots, shoes, and leggings
364510, 36455101, G01F 2500, G05D 706, G06F 1130
Patent
active
049808257
ABSTRACT:
A portable electrohydraulic servo valve analyzer, which has microprocessor-based electronic controller and is operable in a fully automatic mode and a manual mode, is disclosed. The system also includes: a hydraulic manifold block and an adapter block for receiving different servo valve; a servo amplifier and electrical hook-up to the servo valve; pressure gages and hydraulic shut-off valves; a keypad for entering operating input commands and values; two digital displays indicating the current supplied to the valve and the resulting hydraulic flow rate through the valve, and a special turbine flowmeter capable of highly accurate operation of at least three orders of magnitude of flow rates. Most of the system is housed in a single small portable aluminum suitcase. Hydraulic flow is measured by digitally timing the periods between detection of the successive rotating vanes of the turbine, and compensating for nonlinearities in turbine rotation rate at low flows. An optional x-y plotter which may be housed in another suitcase is used in the automatic mode to produce a hard copy of the test results showing the hydraulic flow rate through the servo valve as a function of DC current signal that varies with time and is supplied as an input signal to the valve. This input signal is preferably varied automatically in a manner that puts the valve through a test cycle including its full range of operation. Thus, the test results indicate whether the servo valve is operating properly or needs re-calibration or repair. Preferred methods for operating this servo valve analyzing system are also disclosed.
REFERENCES:
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patent: 4790233 (1988-12-01), Backe et al.
patent: 4797820 (1989-01-01), Wilson et al.
patent: 4811252 (1989-03-01), Furuse
patent: 4885943 (1989-12-01), Tootell
TW Webster Instruments product brochure (12 pages).
Flow Technology, Inc. product brochure for Omniflo Turbine Flow Transducers (3 pages).
Brooks Product Information and Selection Guide, Bulletin SP-110, Sep. 1984 (8 pages).
Omega Engineering, Inc. Flow Measurement and Control Handbook and Encyclopedia, 1985/86, Section F (pages F-1 through F-25).
"Chant Engineering Co. Servo Valve Troubleshooting Kit," Hydraulics and Pneumatics Magazine, p. 12 (Mar. 1988).
Flo-Tech, Inc. product literature, 25 pages.
Shoptaw David R.
Tootell Terence S.
Wilson Keith G.
Gruber Felix D.
Hydro-Craft, Inc.
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