Process for controlling the flow of a fluid in a valve and appar

Details Process for controlling the flow of a fluid in a valve and appar Process for controlling the flow of a fluid in a valve and appar

1987-02-12

1988-08-16

Cohan, Alan

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

437486, 4374875, G05D 706

Patent

active

047636815

ABSTRACT:
Process for controlling the flow of a fluid through a valve having a given section and a movable valve member, in which the pressures of the fluid which are upstream P.sub.upstream and downstream P.sub.downstream of the valve and the position d of the valve member are measured, then the real flow Q.sub.real of the fluid is calculated and compared with a set value Q.sub.0, the difference signal Q.sub.real -Q.sub.0 commanding the displacement of the valve member in the desired direction, said process comprising effecting the real flow calculation by measuring the ratio R=P.sub.upstream /P.sub.downstream which is compared with a predetermined value R and calculating the product Q.sub.sonic =k.times.P.sub.upstream .times.d so that when R>R.sub.0, the product Q.sub.sonic is directly compared with a set value Q.sub.0, the difference signal Q.sub.sonic -Q.sub.0 commanding the displacement of the valve member in the desired direction whereas, when R<R.sub.0, the ratio R is converted into a digital signal whose value corresponds to the address of a memory whose content is converted into an analog correction signal which, after multiplication by Q.sub.sonic, represents a value proportional to the flow Q.sub.subsonic of the fluid at the subsonic rate, this value Q.sub.subsonic being then compared with the set value Q.sub.0, the signal Q.sub.subsonic -Q.sub.0 commanding the displacement of the valve member in the desired direction.

REFERENCES:
patent: 3524344 (1970-08-01), Converse et al.
patent: 4446523 (1984-05-01), Reinke
patent: 4527583 (1985-07-01), Simpson
Control Engineering; "Gas Flow Control"; by Harter; vol. 10, No. 9; Sep. 1963, pp. 101-105.

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