FAHF type tank breathing valve

Overview of FAHF type tank breathing valve products

The tank breathing valve is a spring-loaded limit valve plate that is determined by positive and negative pressure to either exhale or inhale. The breathing valve should have two functions: releasing positive pressure and negative pressure. Specifically, when the container is under positive pressure, the breathing valve opens to exhale gas and release positive pressure; When the container is subjected to negative pressure, the flame retardant breathing valve opens to suck in gas and release the negative pressure. This ensures that the pressure is within a certain range, ensuring the safety of the container. One is to exhale or inhale when a certain pressure is reached. Another approach is to design it purely as breathing without inhaling.

Function of breathing valve in FAHF storage tank

Under normal circumstances, the breathing valve of the storage tank plays a sealing role. To ensure the safety of the storage tank, the tank breathing valve only starts working under the following conditions:

1. When the storage tank outputs materials, the tank breathing valve begins to suck air or nitrogen into the storage tank.

2. When the storage tank is filled with materials, the tank breathing valve begins to discharge the gas from the tank.

3. Due to climate change, the vapor pressure of materials in storage tanks may increase or decrease, and the tank breathing valve may exhale steam or inhale air and nitrogen (commonly referred to as thermal effect).

4. In the event of a fire, the heat exhaled will cause a rapid increase in the evaporation of liquid in the tank, and the tank breathing valve will begin to discharge from the tank to prevent damage due to overpressure.

5. Under other working conditions, such as pressurized supply of volatile liquids, chemical reactions between internal and external heat transfer devices, operational errors, etc., the breathing valve of the tank breathing valve can avoid overpressure in the tank breathing valve. Therefore, it will be exhaled or inhaled, or damaged by ultra vacuum.

Therefore, the breathing valve in the tank breathing valve is very important and cannot be easily replaced. Otherwise, there will be security issues.

Product features of FAHF tank breathing valve

1. Simple structure, easy maintenance, safe and convenient.

2. The valve disc is made of PTFE material, which is resistant to low temperatures and has good anti freezing performance.

3. The shell is made of stainless steel, cast steel, and aluminum alloy, which have good corrosion resistance.

4. The performance fully complies with the standards and regulations of the Ministry of Petroleum Industry.

Principle of tank breathing valve

The breathing valve is a spring limited valve plate determined by the positive and negative pressures of exhalation and inhalation. There are also gravity breathing valves that can be adjusted by gravity. When the pressure inside the container exceeds high pressure, the valve opens to release the pressure. Detailed description: When the pressure in the storage tank is balanced with atmospheric pressure, the exhalation valve disc of the breathing valve is tightly matched with the exhalation outlet valve seat, while the inhalation valve disc is tightly matched with the inhalation outlet valve seat. When the pressure in the storage tank exceeds atmospheric pressure (i.e., when there is excessive positive pressure), the high pressure in the storage tank will directly act on the lower part of the breathing valve, and the weight of the valve and external pressure will act on the valve. Overcome and open the breathing valve.

The valve disc is discharged from the high pressure in the storage tank through channel A, so the pressure in the storage tank is balanced with atmospheric pressure. If the pressure in the storage tank is lower than atmospheric pressure (i.e., the negative pressure generated is too low), atmospheric pressure enters through suction channel B and directly acts under the suction valve disc to overcome the gravity of the valve disc. Acting on the fuel tank above the valve disc. Open the suction valve disc to compensate for pressure, thereby compensating for the pressure in the storage tank and balancing the pressure in the tank with atmospheric pressure.

When a fire occurs, the source of fire may spread from the entrance to the storage tank. When the flame passes through the narrow hole in the fireproof valve core layer of the breathing valve, the wall will cause the corrugated plate to absorb a large amount of heat, resulting in rapid heat loss. Increase to extinguish the flame.

Structural diagram of breathing valve for FAHF storage tank

Main dimensions of FAHF tank breathing valve

FAHF type storage tank breathing valve ordering instructions

Please specify detailed parameters such as product name, nominal diameter, pressure rating, material, flange standard, and operating pressure when placing an order. The above product dimensions are standard universal models. If you need other specifications, non-standard product design drawings and detailed parameters, or if the environment is very important for use and complex, please contact our company for our experts to review and serve you wholeheartedly.

Our company has always adhered to the principles of integrity, quality, and customer first, providing high-quality products and after-sales service to our customers. Welcome to inquire by phone.