Fail-freeze device for positioner

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United States of America Patent

PATENT NO 8517335
APP PUB NO 20110284083A1
SERIAL NO

12784790

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A fail-freeze valve positioner system is disclosed. The system has a transducer with a first type output port connectible to a valve actuator, and a second type input port receptive to a valve position signal that is proportional to an output of the first type output port. In addition, the system has a monitoring circuit that generates a pilot activation signal while predefined conditions are met. A primary piloted valve in communication with the monitoring circuit is coupled to the first valve. The first type output port is disconnected from the valve actuator while the pilot activation signal and thus the first valve are deactivated, holding the valve actuator in place.

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Patent Owner(s)

Patent OwnerAddress
STI SRLVIA G PASCOLI 10 A-B GORLE-BERGAMO 24020

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Tondolo, Flavio Stezzano, IT 15 58
Valoti, Roberto Seriate, IT 4 25

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