Shear Pin is a safety device which breaks in case of mechanical overload, and prevents further damage to machinery, it is sacrificed to protect or prevent damage to bigger and more critical component of machinery. Its mechanical analogous to electrical fuse.
In a hydro power plant this pin is used to couple lever and lever handle, if the two loses synchronism between each other due two some mechanical fault the pin breaks, and air pressure decreases.
Just stay active with this shear pin and its site.It can help you a lot in the working place.
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