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US 6,321,780 B1Granted
Valve for controlling flow rate of gas
AssigneeBenkan Corporation
InventorToshiaki Iwabuchi
Life of this patent
Estimating the term…
Abstract
A valve has a valve body having a passage including a hole in which gas flows, a valve seat surrounding a port of the hole. A valve disc is provided for closing the port of the hole, and an actuator is provided for operating the valve disc in a sine curve motion. The valve includes an inside heater for heating the valve disc.
Claims8
A valve comprising:
- a valve body having a passage including a hole in which gas flows;
- a valve seat surrounding a port of the hole;
- a stem vertically slidably mounted in the valve body;
- a valve disc provided on a lower end of the stem for closing the port of the hole;
- a motor having a driving shaft for operating the stem;
- a crank mechanism comprising an eccentric cam secured to the driving shaft, a slider, guide means for vertically slidably holding and guiding the slider, the slider being slidably engaged with the eccentric cam so as to be vertically moved;
- a constant pressure mechanism having a spring disposed between the stem and the slider;
- the stem and the crank mechanism being so arranged that the valve disc is pressed against the valve seat at an approximately bottom dead center through the spring.
5 more elements
Dependencies are inferred from the claim text.