Multi-function static-errorless pressure control valve

Details Multi-function static-errorless pressure control valve Multi-function static-errorless pressure control valve

1989-09-12

1990-11-27

Cohan, Alan

Fluid handling

Convertible

Reversible check

137488, 1374925, G05D 1610

Patent

active

049728709

ABSTRACT:
The invention relates to a brandnew multi-function static-errorless pressure control method and the valve thereof, in which a cylindrical two-side three-way valve is used as the pilot valve 20 and an asymmetric double-action differential hydraulic cylinder is used as the main valve 10 to constitute an 1-type static-errorless closed-loop negative feedback control system, a transfer means with special oil network connects to the oil circuits 1, 2, 8 and ports 4, 5, 9, L of the system and makes the valve to correspond to six operating modes of the relief valve, remote control relief valve, constant valve pressure reducing valve, constant difference pressure reducing valve, internal control sequence valve and external control sequence valve respectively. The test results have shown that the static error of the pressure control valve of present invention is 0.5%, the overshoot is less than 5%, and no self-excitation is found.

REFERENCES:
patent: 3083726 (1963-04-01), Woelfel
patent: 3227171 (1966-01-01), Woelfel
patent: 3602246 (1971-08-01), Hettinger
patent: 3730214 (1973-05-01), Brumm
patent: 4129141 (1978-12-01), Vogeli

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