Breathing valve inspection and maintenance: In order to ensure the performance of the new all-weather breathing valve to achieve the full use of the purpose. Breathing valve inspection and maintenance in six months. 1, check the pressure valve disc and vacuum disc movements are flexible, guide valve ring contact with or without damage. 2, re-install the pressure valve plate, to ensure that the contact surface should be tight, flexible guide rod movements. 3, the opening of the new breathing valve, you must clear the shock between the valve. Operating pressure: Class A Positive pressure: 355 Pa (36 mm water column) Negative pressure: 295 Pa (30 mm water column) Positive pressure class B: 980 Pa (100 mm water column) Negative pressure: 295 Pa (30 mm water column) Pressure: 1765Pa (180mm water column) Negative pressure: 295Pa (30mm water column) * GFQ all-weather breathing valve * GZW-I flame retardant pipe flame arrester * QZF-89 aluminum weatherproof fire breathing valve * QHXF-89 explosion-proof breathing Valve Keywords in this article: Breathing valve