Part Description:

1. Valve Cover2. Fasteners3. Gaskets4. Vacuum Valve Rod Disc5. Vacuum Valve Seat6. Positive Pressure Valve Rod Disc7. Positive Pressure Valve Seat8. Negative vacuum intake port9. Valve Body10. Flanged Connections11. Overpressure relief valve export

I. Product Introduction

The ADHXF-IV type exhaust valve with call-out manifold is a safety device installed on the top of atmospheric storage tanks. It maintains the pressure within the tanks at a normal level, reducing evaporation losses of volatile liquids inside the tanks, and protecting them from damage due to overpressure or vacuum.

The ADHXF-IV type exhaust gas valve with an exhaust conduit is designed for tank medium conditions where the medium is toxic and polluted. It features that waste gas can be discharged into the recovery pipeline.

II. Working Principle

The ADHXF-IV type exhaust valve with call-out manifold is installed at the top of storage tanks or equipment. It not only maintains pressure balance in 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 of the gas inside the tank falls below the negative vacuum setting pressure of the breathing valve, the atmospheric pressure lifts the vacuum valve disk, adding air into the tank to prevent the pressure from dropping further, thus avoiding the collapse of the storage tank or equipment.

When the internal pressure of the can exceeds the exhaust pressure set for the breathing valve, the pressure valve is lifted by the gas, allowing gas to escape from the can, preventing the internal pressure 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 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 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 calculations and CAD drawings based on the data sheet and operating conditions provided by the customer.

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

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

4. FEP film sheets offer 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 testing of the opening pressure and leakage rate on the pressure testing platform, and is released for production upon passing the inspection.

6. Carbon steel valve bodies are coated with anti-rust primer both inside and out, with an epoxy topcoat applied; stainless steel valve bodies are sandblasted.Plastic valve bodies are subject to polishing treatment.

7. Packaging is统一 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 Valve"

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

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