1. Main application:

   The fire breathing manhole, also known as the relief manhole, is a new technology for production safety protection tank and developed, emergency ventilation device installed in the oil, chemical, material storage tank, usually use and fire breathing valve supporting, can avoid by accident tank sharp overpressure or vacuum, damaged tanks and accidents; and to play safe fire retardant. Is the ideal device for domestic protection tank safety, products to fill the domestic blank. Products using the all-weather sealed structure, with weights to adjust the inhalation valve flap and the pressure release cover opening and closing, stainless steel corrugated belt for fire resistant layer, to prevent the flame through, and a two drawer opening for cleaning, replacement of the fire resistant layer provides a convenient, shorten the time of. In short, the product has a constant pressure discharge, the constant pressure suction, closed the advantages of flexible, safe fire retardant, compact structure, good sealing performance, safety and reliability etc..

2.Main technical parameters

1), Operating pressure: positive pressure +1765Pa (180mmH20) -392Pa (-40mmH20) negative pressure

2), The fire resistance rating: BS5501:IIA standard

3), The applicable temperature: +50--30 ℃

4), use: suitable for material storage vault atmospheric tank cap with nitrogen.

3. Work principle:

The flame arrester breather valve normal working conditions, the fire breathing manhole remained sealed state, storage tank at normal pressure. When the breathing valve work can not meet the accident reason of tank caused by sharp overpressure, pressure cover is automatically opened breathing manhole, emergency relief, so that the pressure in the tank to maintain normal; when the tank pressure rapid decompression or super vacuum, suction valve is opened sharply inhaled air, maintain normal pressure when the tank; inhalation of air with a spark, flame, fire resistant layer plays the role of "wall effect" to prevent flame by, in order to protect the safety of the storage tank.

4. Schematic of products: