Part Description:

1. Valve cover; 2. Fasteners; 3. Gaskets; 4. Negative pressure valve stem and disk; 5. Negative pressure valve seat; 6. Positive pressure valve stem and disk; 7. Positive pressure valve seat; 8. Negative vacuum intake; 9. Wavy flame arrester plate; 10. Valve body; 11. Connecting flange; 12. Overpressure exhaust outlet.

I. Product Introduction

ADHXF-IVZ Type fire arrester with exhaust conduit is used in conditions where flammable and explosive substances are stored in atmospheric storage tanks. It is a safety device that integrates a fire arrester with an exhaust conduit breathing valve, designed specifically for scenarios where the stored tank medium is toxic and polluting.

Its features include discharging exhaust gases into the recirculation pipeline, and also preventing the introduction of open flames into the storage tank when air is inhaled through the breathing valve, which could cause an explosion.

II. Working Principle

The ADHXF-IVZ type fire arrester breathing valve with call-out connection is installed at the top of storage tanks or equipment. It not only maintains the pressure balance of the tank, ensuring the tank is protected from damage under overpressure and vacuum conditions, 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 breathing valve, atmospheric pressure lifts the vacuum valve disc, injecting air into the drum to prevent further pressure drop, thus avoiding the collapse of the storage drum or equipment.

When the pressure of the gas inside the cylinder exceeds the exhaust pressure setting of 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: Breathing Valves of Petroleum Storage Tank Accessories, for atmospheric (including internal vacuum) storage tanks, specifies the following opening pressure for the breathing valves:

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

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

Four, Product Advantages

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

2. Eddie summarizes years of design and manufacturing experience, optimizing the sealing form of the breathing valve, 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. Utilizing a tower-type valve disc structure and imported FEP diaphragm technology, achieves a 10% overpressure technology.

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

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

6. Carbon steel valve bodies are coated with anti-rust primer inside and out, with an epoxy topcoat applied to the exterior; stainless steel valve bodies undergo a sandblasting process; plastic valve bodies are polished.

7. Uniform standard wooden boxes are used for packaging.

V. Relevant Regulations for the Product

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

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

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

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

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

ISO16852 - International Flame Retardant Tester Standard