Single Call Valve Component Description:

1. Valve cover; 2. Fasteners; 3. Gasket; 4. Positive pressure valve stem disk; 5. Positive pressure valve seat; 6. Valve body; 7. Connecting flange; 8. Exhaust port.

Single-Stage Valve Component Description:

1. Valve cover; 2. Fasteners; 3. Gasket; 4. Vacuum valve stem disk; 5. Vacuum valve seat; 6. Valve body; 7. Connecting flange; 8. Suction port.

I. Product Introduction

The ADHXF-V/VI type single call valve/single suction valve is a safety device located at the top of atmospheric storage tanks, designed to maintain the pressure inside the tanks at a normal level. It is used to reduce the evaporation loss of volatile liquids within the storage tanks and to protect the tanks from damage due to overpressure or vacuum.

II. Working Principle

The ADHXF-V/VI type single call valve/single suction valve is installed at the top of storage tanks or equipment, not only maintaining the pressure balance of the storage tank to prevent damage from overpressure, but also reducing oxidation and loss of the medium inside the tank.

When the internal pressure of the can exceeds the set pressure of the single exhaust valve, the pressure valve is lifted by the gas, allowing gas to be expelled from the can, thereby preventing the internal pressure from rising further.

When the internal pressure of the tank falls below the set pressure of the single-acting valve, atmospheric pressure lifts the vacuum valve disc, injecting air into the tank to prevent pressure from dropping further, thus avoiding the collapse of the storage tank or equipment.

III. 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 for atmospheric (including internal pressure) petroleum storage tanks as follows:

The 5 grades required by SY/T0511.1-2010 all have breathing valves that open via gravity-assisted operation.

In API 2000, the typical set pressure range for gravity-operated breath valves is -4.3 KPa to +6.9 KPa, while the set pressure for spring-loaded breath 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 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 of liquids and vapors, extreme temperature, and bonding due to valve seat freezing.

5. Prior to shipment, each unit undergoes testing on a pressure testing platform for startup 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 on the exterior; stainless steel valve bodies are sandblasted.Plastic valve bodies are polished.

7. Standard wooden boxes are used for uniform packaging.

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 & Petrochemical Storage and Transportation System Tank Farm Design Specification"

• GB50160-2018 -- Standard for Fire Prevention Design of Petroleum and Chemical Industry Enterprises