The utility model provides a kind of steel valve chain lock, including locking
assembly, first
locking mechanism and chain, wherein, locking
assembly is equipped in the top of
ball valve, locking cavity is equipped on locking
assembly, and the valve core switch of
ball valve is equipped in locking cavity;First
locking mechanism is equipped in the bottom of locking assembly, and first
locking mechanism is used to fix locking assembly and
ball valve in axial direction;Chain is equipped on locking assembly at one end, and chain is locked with locking assembly after passing through the valve body of ball valve, to fix locking assembly and ball valve in radial direction.The utility model forms
protective barrier by locking cavity full
package valve core switch, cooperates with the first locking mechanism of axial fixation and the chain of radial fixation to form three-dimensional constraint, so that the valve core switch of ball valve is completely separated from contactable range, double locking mechanism breaks through the passive protection mode of traditional warning sign, fundamentally eliminates the physical possibility of
valve stem rotation, and then prevents ball valve from opening when stopping gas maintenance, improves the safety of
pipe network maintenance.