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Double Port Air Evacuation Valve - Automatic Release Air | China Suppliers & Factory for Optimal Pipeline Solutions
| 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 |
Characteristics
The structure of double port exhaust valve is usually composed of valve body, floating ball, exhaust nozzle, etc. the floating ball is mostly stainless steel, with long service life, safety and reliability
Advantages
1
Efficient exhaust under all working conditions (the core advantage)
Large flow rapid exhaust (main port): when the pipeline is filled with water and started, the main exhaust port is fully opened to instantly discharge the accumulated gas in the pipeline (up to 150 l/min for DN 100), completely eliminate the air resistance, quickly improve the efficiency of water delivery/heating, and avoid flow attenuation and pressure instability.
Micro continuous exhaust (auxiliary port): when the system is running normally, the auxiliary port (micropore) works for a long time to automatically discharge the dissolved gas (oxygen, carbon dioxide) continuously precipitated from the water, eliminate the formation of gas plug and cavitations after long-term operation, and maintain the "zero gas resistance" and efficient operation of the pipeline.
2
Reliable structure and long service life
One valve dual function: it integrates "rapid exhaust, micro exhaust and negative pressure air replenishment", replaces the two sets of devices of single port exhaust valve + air replenishment valve, and reduces installation points and fault points.
Pure mechanical structure: no electrical components, adaptive action by floating ball and pressure, corrosion resistance, water hammer resistance, outdoor/humid/high temperature environment, very low failure rate.
Packing
Standard export wooden case packaging
Frequently Asked Questions
Q
What is a double port exhaust valve and how does it differ from a single port exhaust valve?
A double port exhaust valve features both a main (large flow) exhaust port and an auxiliary (micro) exhaust port. Unlike a single port exhaust valve that handles only one exhaust function, the double port design integrates rapid bulk exhaust during pipeline start-up and continuous micro exhaust during normal operation — effectively replacing two separate devices in one unit.
Q
What temperature range is this double port exhaust valve suitable for?
This valve is designed to operate within a temperature range of -20°C to 120°C, making it suitable for a wide variety of pipeline systems including heating, water supply, and industrial applications exposed to varying thermal conditions.
Q
What standards does this exhaust valve comply with?
This double port exhaust valve complies with multiple international standards including BS (British Standard), API (American Petroleum Institute), DIN (German Institute for Standardization), and JIS (Japanese Industrial Standards), ensuring compatibility with global pipeline systems and engineering specifications.
Q
How does the floating ball mechanism ensure reliable sealing and exhaust performance?
The floating ball — typically made of stainless steel — rises with the water level to automatically seal the exhaust port when the pipeline is full, and drops to open it when air or gas is present. This purely mechanical, self-starting operation requires no electrical components, resulting in zero leakage sealing and a very low failure rate even in harsh outdoor or high-humidity environments.
Q
Can this valve handle negative pressure or air replenishment situations?
Yes. The double port exhaust valve integrates negative pressure air replenishment functionality. When pipeline pressure drops below atmospheric pressure (e.g., during sudden shutdown or drainage), the valve automatically opens to allow air intake, preventing pipeline collapse, water hammer damage, and protecting the entire system.
Q
What packaging is used for shipping, and is it suitable for export?
Each double port exhaust valve is packaged in a standard export wooden case, specifically designed to protect the product during international freight and long-distance transportation. The packaging meets general export requirements and ensures the valves arrive in perfect condition at their destination.