Valve safety lock, also known as LOTO valve lock, is one of industrial safety locks. The purpose is to ensure that the valve can be absolutely closed or opened in a safe state. The locking of the valve can effectively prevent the safety problems caused by the misoperation of the relevant personnel. The use of valve safety lock, to a large extent to improve the safety of the valve, especially in the enterprise factory this place, the use of LOTO valve lock can ensure the normal production activities.