Valve Actuator with Degressive Characteristic Spring
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United States of America Patent
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Issued Date -
Mar 6, 2014
app pub date -
Sep 5, 2012
filing date -
Sep 5, 2012
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An actuator for a gate valve having a gate has a stem coupled to a gate. A spring is coupled to the stem and has an extended length position while the gate is in a closed position and a contracted length position while the gate is in an open position. The spring has a degressive characteristic such that a graph of a force required to move the gate from the closed position to the open position versus a deflection of the spring is a nonlinear curve with a positive slope that decreases when moving from the closed to the open position. The spring may be an array of wavy springs arranged in nested and in valley-to-crest combinations.
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