Fire safety fusible link valve-the fire safety ball valve with automatic thermal shutdown device (Thermal Shut-Off Valves), also known as fire cut off valve, fire fuse valve, high-temperature fuse valve, without a power supply or air source. It’s a kind of fire safety fire protection, the device is designed to automatically close the valve in the event of high temperature or fire. The product has high-quality ball valves with API 607 fire protection certification.