| 摘要 |
An electro-thermal gas valve uses a mechanical energy storage device, preferably a C-spring or a coil spring, to effect a snap opening and closing of a poppet in response to the position of a heat warpable bimetal member and, therefore, is relatively insensitive to gas pressure in the valve enclosure. Application of heat to the bimetal member causes relative movement of the opposite ends of the energy storage device to effect over-center travel of one end relative to the other end, whereupon the stored potential energy in the energy storage device is released as kinetic energy to snap the poppet open or closed. The valve is adjustable and due to its relative insensitivity to pressure in fact may be calibrated before the valve container and cover are assembled. A stop mechanism may be provided to assume affirmative support of the energy storage device whether the valve is open or closed, and a light bias spring may be utilized to help maintain the poppet closed until snapped open.
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