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. Negative vacuum inlet 8. Valve body 9. Connecting flange 10. Wavy flame arrester plate 11. Positive pressure valve seat 12. Overpressure exhaust outlet

I. Product Introduction

ADHXF-IIZ dual outlet breathing valve is designed for storage of flammable and explosive materials in atmospheric storage tanks, integrating a flame arrester with a breathing valve equipped with an exhalation outlet into a comprehensive safety device.

The ADHXF-IIZ type dual-breeching breathing valve is designed for conditions where the stored medium is toxic, polluting, and reactive with air. Its features include the ability to exhaust waste gases into the recovery pipeline, and the option to connect to a nitrogen pipeline to intake nitrogen for compensating for pressure loss in the storage tank.

Section 2: Working Principle

The ADHXF-IIZ dual outlet breathing valve is installed at the top of tanks or equipment, maintaining pressure balance in the storage tank and ensuring the tank is protected from damage during overpressure and vacuum conditions. It also reduces oxidation and loss of the medium inside the tank.

When the internal pressure of the cylinder drops below the negative vacuum set pressure of the breathing valve, the nitrogen introduced will lift the vacuum valve disc, replenishing nitrogen into the cylinder to prevent further pressure drop, thereby avoiding the collapse of the storage tank or equipment.

When the pressure of the gas inside the tank exceeds the exhaust pressure setting of the breathing valve, the pressure valve is lifted by the gas, allowing the gas to be expelled from the tank, thereby preventing the pressure inside the tank 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 for breathing valves on atmospheric (including internal vacuum) 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 the 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 table and operating conditions provided by the customer.

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 disk structure and imported FEP diaphragm technology, achieves a 10% overpressure technology.

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

5. Prior to shipment, each unit undergoes testing on a pressure test 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; stainless steel valve bodies are sandblasted; plastic valve bodies are polished.

7. Packaging is统一in standard wooden crates.

V. Relevant Standards for the Products

• 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——Petroleum & Chemical Storage & Transportation System Tank Farm Design Specification

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

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

• ISO16852-------------- "International Standard for Fire Extinguisher Testing"