Problems with direct-connection breath valves

By direct-type breathing valve, do you mean a direct-discharge type breathing valve? Breath valves are divided into direct-discharge type and pipeline type; the direct-discharge type discharges directly into the atmosphere at its outlet ； A pipe-type breather valve allows for the connection of a pipe at the outlet to collect exhaust gases.

Breath valves generally come in two types: direct-discharge type and pipeline-type. The specific types include: all-weather breath valve (HXF-I), explosion-proof flame-retardant breath valve (HXF-IZ), breath valve with dual pipes (HXF-II), flame-retardant breath valve with dual pipes (HXF-IIZ), breath valve with an intake pipe (HXF-III), flame-retardant breath valve with an intake pipe (HXF-IIIZ), breath valve with an exhaust pipe (HXF-IV), flame-retardant breath valve with an exhaust pipe (HXF-IVZ), single-exhaust valve (HXF-V), explosion-proof flame-retardant single-exhaust valve (HXF-VZ), single-intake valve (HXF-VI), explosion-proof flame-retardant single-intake valve (HXF-VIZ), emergency vent manhole (HXF-R), breathing manhole (HXF-HR), explosion-proof flame-retardant breathing manhole (HXF-HRZ), and so on! Breather valve: In accordance with the **standard \"Code for Fire Protection Design of Petrochemical Enterprises\" (GB50160-92), fixed-roof tanks storing Class A and B liquids shall be equipped with flame arresters and breather valves.** It is evident that breathing valves and flame arrestors are essential safety devices for storage tanks. It not only prevents the storage tank from being damaged under conditions of overpressure and vacuum, but also maintains pressure balance within the tank, thereby reducing the evaporation and loss of the medium stored in it. The breather valves produced by our company feature a compact structure, high air flow capacity, low leakage rate, and excellent sealing performance. Recently, an explosion-proof flame-arresting breathing valve of international advanced standard (HXF-IZ type) has been developed; the flame arrester is located at the inlet of the breathing valve, thereby completely preventing fire sources from entering the shell. It has advantages such as small size, light weight, and ease of maintenance, cleaning, and replacement. Main technical parameters: 1. Suitable for various materials such as petroleum, chemicals, pharmaceuticals, energy sources, as well as special liquids or gases. 2. Operating pressure: A. -295 pa (-30 mmH2O) to +355 pa (+36 mmH2O); B. -295 pa (-30 mmH2O) to +980 pa (+100 mmH2O); C. -295 pa (-30 mmH2O) to +1750 pa (+180 mmH2O); D. -295 pa (-30 mmH2O) to +98,000 pa (+10,000 mmH2O). 3. Explosion protection rating: BS5501: IIA, IIB, IIC.