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Spring-type fast-closing butterfly valve mainly by the butterfly valve, hydraulic - spring drive, hydraulic station and electric control box and other components. Open the valve, the system sends instructions (electric control box set to remote control), the hydraulic station work, hydraulic oil into the bottom of the cylinder to promote the butterfly valve open, while the spring cylinder spring is compressed storage. When an emergency occurs in the work system, the butterfly valve will receive an accident signal and close rapidly under the action of a spring. The closing time is from 013 to 015s, thus protecting the working system and the pipeline equipment. Due to the fact that the working medium of the butterfly valve is rapidly closed in the high-temperature gas, a special structure is adopted when designing the butterfly valve. (1) butterfly disc with three eccentric structure, so that in the process of opening and closing the butterfly valve, the sealing surface of the butterfly plate will instantly break away from the sealing surface of the valve body at the moment of opening, and only in the closing moment, the sealing surface of the butterfly plate Will contact and squeeze the valve body sealing surface to ensure that the seal, eliminating the two sealing surfaces between the wear and abrasion. At the same time oblique cone structure with self-positioning function, to ensure that the disc is neutral. (2) Floating ring disc Metal-graphite sandwich ring can be used as a floating seal, when the butterfly valve during installation or use of the temperature changes, the floating seal can compensate for the slight deformation of the valve body, so that the butterfly valve seal Always be in the best condition. (3) shaft temperature compensation mechanism As the use of high temperature butterfly valve, taking into account the thermal expansion of the valve shaft effect, in order to prevent the valve shaft to withstand the valve can not be normally opened in the upper and lower shaft end of the addition of a temperature compensation mechanism, Through several sets of support pads with the same disc spring temperature caused by the valve shaft size changes automatically adjusted to compensate for the adverse deformation caused by the unfavorable factors in order to ensure that the disc does not offset the shaft end of the leakage, tail End is not damaged. Quickly close the butterfly valve normal working state (power state) is normally open state, only in the system failure (power off state) required to be able to quickly shut down. According to this characteristic, it is required that the driving device must have an automatic reset function, that is, when the power is on, the driving device opens the butterfly valve, and the driving device automatically resets to close the butterfly valve when the power is cut off. Automatic reset drive a wide range of devices, taking into account the higher safety requirements of the butterfly valve, the use of the fork drive and spring return structure, which mainly by the box, fork, cylinder, piston, piston rod, spring and spring cylinder composition. Due to the fast closing time of the butterfly valve within the requirements of 015s, taking into account the use of performance, the fork in the use of alloy steel pin material, equipped with cylindrical roller bearings in the contact portion of the fork, the cylinder piston force is transmitted to the rolling Fork, so that not only reduces friction, improve life expectancy, but also improve the torque transfer efficiency. Thanks to the spring action mechanism, the safety of the spring is carefully considered. The separate safety screw makes it unnecessary to use special tools and ensure the personal safety of the operator when the spring needs to be installed and disassembled in the field. Loading and unloading the spring is safe and easy.