Fire-Stop Single Call Valve Component Description:

1. Valve cover 2. Fasteners 3. Gaskets 4. Positive pressure valve stem disc 5. Positive pressure valve seat 6. Valve body 7. Flange connection 8. Bellows flame arrester plate9. Rain and dust-proof hat; 10. Exhaust port

Fire Retardant Single-acting Valve Component Description:

1. Valve cover; 2. Fasteners; 3. Gasket; 4. Negative pressure valve stem disk; 5. Negative pressure valve seat; 6. Valve body; 7. Connecting flange; 8. Wavy flame arrester plate.9. Rainproof and Dustproof Hat; 10. Intake Port

I. Product Overview

ADHXF-VZ/VIZ type flame arrestor single exhaust valve/single intake valve is used for storage conditions of flammable and explosive substances in atmospheric storage tanks, and is a safety device that integrates a flame arrester with a weatherproof 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.

2. Working Principle

ADHXF-VZ/VIZ type flame arrestor single exhaust valve/single suction valve is installed at the top of storage tanks or equipment. It not only maintains the pressure balance of the storage tank and prevents external open flames from entering the tank; but also reduces oxidation and loss of the medium inside the tank.

When the pressure inside the drum falls below the negative vacuum setting of the flame arrester check valve, atmospheric pressure lifts the vacuum valve disk, replenishing air into the drum to prevent pressure from dropping further, thus avoiding the collapse of the storage tank or equipment.

When the pressure inside the can exceeds the exhaust pressure setting of the flame arrestor valve, the pressure valve is lifted by the gas, allowing gas to escape from the can, preventing the pressure inside from rising further.

III. Set Pressure 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 gravity-assisted opening for the breath 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.

IV. Product Advantages

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

2. Eddie summarizes years of design and manufacturing experience, optimizing the breathing valve sealing form, sealing material, pressure setting points, flow coefficient, and return seat sealing. As a result, the breathing valve achieves zero-leakage sealing effect at 80% of the set pressure.

3. Employed tower-type valve disc structure and imported FEP diaphragm technology to achieve 10% overpressure technology.

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

5. Prior to shipment, each unit undergoes testing on a pressure test platform for startup pressure and leakage, and is released for production upon passing the test.

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 uniformly done in standard wooden crates.

V. Relevant Standards for the Product

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

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

• SH/T3007-2014——Petroleum & Chemical Storage and Transportation System Tank Farm Design Specification

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

• GB5908-2005--------Flame arrester for oil storage tanks

ISO 16852 -- International Flame Retardant Tester Standard