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Custom Two port vent valve regulating air pressure Suppliers, Manufacturers
Custom Two port vent valve regulating air pressure Suppliers, Manufacturers
Custom Two port vent valve regulating air pressure Suppliers, Manufacturers
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Custom Two port vent valve regulating air pressure Suppliers, Manufacturers
Custom Two port vent valve regulating air pressure Suppliers, Manufacturers
Custom Two port vent valve regulating air pressure Suppliers, Manufacturers

Custom Two port vent valve regulating air pressure Suppliers, Manufacturers

Type：Flanage type

Series：QB2-10/16

Size: DN40-DN300/2”-12”

Pressure rating: PN6/PN10/PN16/PN25

Design standard: BS/API/DIN/JIS

Service: OEM&ODM

The double port air release valve is suitable for pipelines with water as the working medium and acts as a device for excluding gases from the pipeline, so as to improve the efficiency of water transmission equipment and protect the pipeline from deformation and rupture. It is a pipeline equipped equipment.

Application Scenarios

The double port air evacuation valve is suitable for pipes with water, hot water and temperature of 100 ℃ to discharge all the gases in the pipes.

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Product Description

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Product Specifications

Valve Type: Exhaust valve Structure: Double port
Standard: BS/API/DIN/JIS Workmanship: Investment casting
Sealing Direction: Single-directional Sealing Grade: Zero leakage
Temperature: -20°C < T < 120°C Operation: Self-starting
Exhaust Valve Technical Diagram
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Key Characteristics

The core advantage of the double port air evacuation valve lies in the independent control of double channels. This design achieves simultaneous high-speed large exhaust, continuous micro exhaust, and automatic negative pressure air replenishment. It comprehensively solves pipeline air resistance and negative pressure safety issues, proving more efficient and reliable than traditional single port valves.
Valve Characteristics
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Core Advantages

✔
Two-way pressure balance & Double safety protection:
Positive pressure venting automatically relieves pressure during medium expansion to prevent overpressure explosions.
✔
Negative pressure air replenishment:
During pump shutdowns or water hammers, the valve switches to suction mode to balance internal pressure, protecting flexible pipelines (PVC/PE) from deformation.
✔
Anti-backflow Seal:
Integrated one-way valve prevents media leakage and environmental pollution.
✔
Reliable Structure & Longevity:
Main and auxiliary ports seal independently. Floating balls are precision-matched with sealing surfaces to eliminate gas residue and leakage.
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Material Construction

Component Material Options
Body & Bonnet Cast iron HT200 / Stainless steel / Carbon steel
Floating Ball 304 Stainless steel / Vent: H59 brass
Sealing Ring NBR
Elastic Screw A3
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Main Dimensions

Dimension Drawing
Model DN (mm) Main Dimensions (mm)
D D1 D2 L Z-Φd
QB2-10 40 145 110 85 430 4-Φ18
50 160 125 100 430 4-Φ18
75 195 160 135 470 4-Φ18
100 215 180 155 500 4-Φ18
150 280 240 210 540 8-Φ20
200 335 295 265 700 8-Φ20
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Packing & Delivery

All products are packed in standard export wooden cases to ensure safety during international transit.
Standard Export Packing
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Frequently Asked Questions

Q1: What is the primary function of a double port air evacuation valve?
It is designed to automatically discharge air from pipelines during filling and admit air when the line is being emptied, preventing air pockets and pipeline collapse.
Q2: Can this valve handle both high-speed and micro-exhaust?
Yes, the double port design allows for simultaneous high-speed large volume exhaust and continuous micro-exhaust during normal system operation.
Q3: How does the valve protect against negative pressure?
When negative pressure occurs (due to pump failure or rapid drainage), the valve automatically opens to inhale external air, balancing the pressure and protecting the pipe from suction damage.
Q4: What are the main materials used for construction?
The body is typically made of HT200 cast iron, stainless steel, or carbon steel, while the floating ball is high-quality 304 stainless steel or brass.
Q5: Is the valve suitable for high-temperature applications?
The valve is rated for temperatures ranging from -20°C to 120°C, making it suitable for a wide variety of industrial and water supply conditions.
Q6: What standards does the valve comply with?
Our double port valves are manufactured to comply with major international standards including BS, API, DIN, and JIS.

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