Butterfly knowledge - fast closing spring Butterfly structure
Hongfeng Introduction butterfly structure: spring mainly by quick closing valve butterfly valve, hydraulic - spring drive, hydraulic and electrical control box and other components. When the valve is opened, the system sends commands (electronic control box is set to remote control), hydraulic work station, hydraulic oil into the bottom of the cylinder to push the piston driven valve open, while the spring cylinder spring is compressed storage. When operating the system in case of emergency, the valve receiving the accident signal, quickly closed by spring action, the closing time is 013 ~ 015s, and thus play a role in the protection of piping systems and equipment. Since the fast closing valve working medium in the high temperature gas, thus butterfly design, the use of a special structure. (1) disc disc three-eccentric structure, the valve opening and closing process, the sealing surface of the disc will be immediately in the opening moments from the valve sealing surface, during shutdown only in the moment closed, the disc sealing surface before come into contact with and pressed against the valve seal sealing surface to ensure the complete elimination of the two sealing surface wear and scratches. At the same taper structure having self-positioning function, ensure the disc neutral. (2) floating seal disc of metal - graphite interlayer seal with floating seal form, when the butterfly appears temperature changes in the installation or use of, the floating ring can trace deformation compensation valve, butterfly valve seal always in the best condition. (3) shaft temperature compensation mechanism due to the higher temperature butterfly valves, taking into account the effect of thermal expansion of the valve shaft, in order to prevent the valve shaft causing the valve can not withstand normally open, the upper and lower end of the shaft while additional temperature compensation mechanism, Singles by several groups with the same spring action of the valve shaft support pads dimensional changes caused by temperature automatically adjust to compensate the extra negative factors caused by the deformation, so as to ensure that the disc is not shifted, shaft does not leak, the tail end is not damaged. Fast closing valve normal operating state (ON state) is normally open only during system failure (power off state) only requires the ability to quickly shut down. According to the characteristics and requirements of the drive must have automatic reset function, which means butterfly valve is energized when the drive is turned off when the drive is automatically reset so that the butterfly valve is closed. Automatic drive reset many species, taking into account the safety valve higher performance requirements, using a fork drive and spring return structure, mainly by the box, forks, cylinder, piston, piston rod, spring and spring cylinders etc. composition. Due to the rapid valve closing time of the request within 015s, taking into account the performance, the fork pin alloy steel material, the fork contact portion is fitted with cylindrical roller bearings, piston cylinder power passed to a rolling manner dial fork, so that not only reduces friction, improves the life, but also improves torque transfer efficiency. As a result of the spring action mechanism, spring safety made careful consideration, independent security screw, so that once the needs in the field of spring installation and removal, without special tools, and to ensure operator safety. The spring loading and removal that is safe and convenient.