Part Description:

1. Limiting sleeve rod; 2. Fastening stud; 3. Rainproof and dustproof cap; 4. Bird-proof cover; 5. Positive pressure valve rod and disk; 6. Positive pressure valve seat; 7. Valve body.8. Fire Retardant Elements; 9. Fire Retardant Box Door Cover; 10. Connecting Flange; 11. Dustproof Mesh; 12. Negative Pressure Valve Seat; 13. Negative Pressure Valve Stem and Disc; 14. Valve Cover

I. Product Overview

The AD1200Z model (Type 89) all-weather flame arrester breathing valve is designed for use in atmospheric storage tanks storing flammable and explosive materials. It is a safety device that integrates a flame arrester with an all-weather breathing valve.

It maintains the pressure in atmospheric storage tanks at a normal level, reducing evaporation losses of volatile liquids inside the tanks and protecting them from damage due to overpressure or vacuum; additionally, it prevents the introduction of open flames into the tank through the breathing valve, which could lead to tank explosions.

The AD1200Z model (89 model) all-weather flame arrester breathing valve is a new product. Compared to the commonly used breathing valves in China, it features a larger air volume, lower flame arrester pressure, and operates under overpressure and negative vacuum as a separate valve cavity, offering better stability. It is frequently used in large-scale storage and transportation projects.

2. Working Principle

When the internal pressure of the cylinder falls below the negative vacuum setting pressure of the breathing valve, atmospheric pressure opens the vacuum valve disk, injecting air into the cylinder to prevent further pressure drop and avoid collapsing the storage tank or equipment.

When the pressure of the gas inside the cylinder exceeds the exhaust pressure set by the breathing valve, the pressure valve is lifted by the gas, allowing the gas to escape from the cylinder, preventing the pressure inside the cylinder from rising further.

Section 3: Pressure Setting Range Activation

SY/T0511.1-2010----Section 1 of "Petroleum Storage Tank Accessories – Part 1: Breathing Valve" specifies the opening pressure of the breathing valve for atmospheric (including internal pressure) petroleum storage tanks as follows:

The 5 grades required by SY/T0511.1-2010 all feature a gravity-assisted opening method for the breathing valves.

In API 2000, the typical set pressure range for gravity breathing valves is -4.3 KPa to +6.9 KPa, while the set pressure for spring-loaded breathing valves must exceed this range.

Section 4: Product Advantages

1. Provide professional breathing valve calculation sheets and CAD drawings based on the data tables and operating conditions provided by the customer.

2. Eddie summarizes his years of design and manufacturing experience, optimizing the sealing form of the breathing valve, sealing material, pressure set point, flow coefficient, and return-to-seat sealing, resulting in a zero-leakage seal effect at 80% of the set pressure.

3. Utilizing a tower-type valve disc structure and imported FEP diaphragm technology, achieves 10% overpressure technology.

4. FEP film sheets feature resistance to chemical corrosion, adhesion of liquids and vapors, extreme temperature, and bonding due to valve seat freezing.

5. Prior to shipment, each unit undergoes pressure and leakage testing on a test pressure platform. Units that pass are then released for production.

6. Carbon steel valve bodies are internally and externally coated with anti-rust primer, with an epoxy topcoat applied externally; stainless steel valve bodies are sandblasted.Plastic valve bodies are subjected to polishing treatment.

7. Packaging is unified with standard wooden crates.

V. Relevant Standards for the Product

• API 2000-2014 ------ Ventilation Atmospheric and Low-Pressure Storage Tanks

• SY/T0511.1-2010 -- "Petroleum Storage Tank Accessories - Part 1: Breathing Valve"

• SH/T3007-2014 —— Specification for Design of Storage Areas of Petrochemical Storage and Transportation Systems

• GB50160-2018-------"Fire Protection Standard for Design of Petroleum and Chemical Industry Enterprises"

• GB5908-2005--------"Petroleum Storage Tank Fire Extinguisher"

• ISO16852-------------- International Flame Retardant Test Standard