F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
341/97
F16K 37/00 (2006.01) G05D 3/00 (2006.01) G05D 3/12 (2006.01)
Patent
CA 1200590
Abstract: Valve converter/positioner with remote feedback and memory A valve positioning mechanism, configurable as either a positioner or a converter, acts in response to a control signal supplied over a two-wire transmis- sion line by a remotely-located controller, and pro- vides a feedback signal over the same two-wire line to the controller. Depending on the configuration used, this feedback signal verifies either that the valve has assumed the position directed by the controller or that the actuating pressure to the valve is as directed by the controller. The control signal triggers an elec- tropneumatic switch which initiates the flow of air to operate a pneumatic mechanism driving the valve stem. A variable inductor, its inductance value being depen- dent upon the valve position/actuating pressure, forms part of an oscillator whose output frequency varies with the inductance value. The oscillator in turn provides a measurement signal to the controller over the two-wire transmission line, the frequency of the signal being proportional to the valve position/ actuating pressure. The controller terminates adjust- ment of the valve when the measurement signal equals the controller setpoint. Upon loss of power, the valve can be maintained at a pre-existing position, or, in an optional arrangement, be returned to a fail-safe condition, with or without a predetermined delay.
437562
Bolz Carl W.
Graves Norman S.
Olsen Everett O.
Peterson Neal D.
Foxboro Company (the)
Smart & Biggar
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