ADHXF-VIII Type Single-Stage吸入阀接管部件Description:

1. Valve cover 2. Fasteners 3. Gasket 4. Vacuum valve stem disc 5. Vacuum valve seat 6. Valve body 7. Connecting flange 8. Inlet flange

ADHXF-VIIIZ Type Single-Blade Valve with Fire-Resistant Fitting 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 plate9. Inlet Flange

I. Product Overview

The ADHXF-VIII(Z) Type Flanged (Fire-Resistant) Single-Stage Valve is a safety device located at the top of atmospheric storage tanks. It maintains the tank's pressure at a normal level, protecting it from damage caused by vacuum.

Its features include the ability to connect to a nitrogen pipeline, to inhale nitrogen to compensate for pressure loss in the storage tank.

2. Working Principle

The ADHXF-VIII(Z) type single suction valve with a connection (fire-retardant) is installed at the top of storage tanks or equipment, which not only maintains pressure balance in the tank but also ensures the tank is protected from damage under negative vacuum.

When the internal pressure of the cylinder falls below the set pressure of the single-acting valve, the nitrogen being introduced will lift the vacuum valve disk, replenishing nitrogen into the cylinder to prevent pressure from dropping further, thereby avoiding the collapse of the storage tank or equipment.

3. Set Pressure Range Activation

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

The 5 grades required by SY/T0511.1-2010 all feature gravity-assisted breathing valve opening methods.

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 table provided by the customer and the operating conditions.

2. Eddie, with years of design and manufacturing experience, optimized the breathing valve's sealing form, sealing material, pressure set point, flow coefficient, and return-to-seal 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 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 tests on the test pressure platform, and is released for production upon passing the inspection.

6. Carbon steel valve bodies are coated with anti-rust primer on the inside and outside, with an epoxy topcoat applied to the exterior; stainless steel valve bodies undergo sandblasting treatment.Plastic valve bodies are subject to polishing treatment.

7. Standard wooden boxes are used for uniform packaging.

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 and 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 Flame Retardant Test Standard