Fɛɛrɛ ye kɛ̈ɛ̈r ye kɛ̈ɛ̈r ye kɛ̈ɛ̈r ye kɛ̈ɛ̈r ye kɛ̈ɛ̈r ye kɛ̈ɛ̈r 2, ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony ye kony 3, anti-corrosion performance strong, long service life; 3, anti-corrosion performance strong, long service life; 3, anti-corrosion performance strong, long service life; 4, ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan ye raan Used in mechanical exhaust system, is a 280°C fire-proof valve, usually closed, when fire occurs by fire automatic alarm link signal automatically opened, while having a manual execution mechanism, can be manually opened, or can be opened remotely in the fire control center (i.e. link control, manual control, automatic control three ways).