YDK BRASS THREADED AIR RELEASE VALVE | MODEL: KAX(T)-16

In domestic water supply systems, HVAC piping, chillers, and small branch pipe assemblies, accumulated air easily causes air lock, which obstructs the flow and creates noise in the pipes. The YDK brass threaded air release valve, Model KAX(T)-16, is a compact automatic air release solution with flexible threaded-connection installation, helping to remove air pockets that build up at the high points of the system.

Construction of the YDK brass threaded air release valve KAX(T)-16

The YDK brass threaded air release valve KAX(T)-16 belongs to the single air valve type, with a construction of 6 main parts:

Common dimensions of the YDK brass threaded air release valve

The length L, height H, and thread size R of the air release valve will help engineers draw accurate designs and plan the actual installation space with ease:

Operating principle of the brass threaded air release valve

The YDK air release valve, KAX(T)-16, operates automatically through a fully automatic floating-ball mechanism, with no manual intervention required. The operating principle of the device is based on the difference in density between air and water, as follows:

1. Water filling / system start-up stage

When the pipeline begins to be filled with water, the air in the pipe is pushed toward the high points (where the air release valve is installed). At this point there is no water in the valve chamber and the float sits in its low position → the air vent opening is fully open, and air escapes freely to the outside at a high flow rate.

2. Normal operation stage (micro-venting)

When the pipeline is full of water, the water rises in the valve chamber, pushing the float upward and pressing the float pin/seat against the vent opening to seal it. The valve is then fully closed, preventing water from leaking out.

However, during operation, air is still continuously generated in the pipeline due to:

• Dissolved air separating out of the water (due to changes in pressure/temperature)
• Air leaking in through joints and pumps
• Chemical reactions/mild corrosion inside the pipe

This air gradually accumulates at the top of the valve, pushing the water level in the valve chamber down so the float lowers with it. The vent opening cracks open slightly, and air escapes continuously while no water leaks out. This is because the air pressure always “wins” and keeps the water level below the float’s sealing threshold.

3. Water draining / negative pressure event stage

When water is drained from the pipeline or a local vacuum occurs (water hammer, bottom drain-off, etc.), the water level in the valve chamber drops rapidly and the float falls to the bottom, opening the vent wide again. This allows outside air to rush into the pipe quickly to balance the pressure, avoiding a vacuum that could dent or rupture the pipe.

Comparison of the YDK KAX(T)-16 threaded air release valve and KAX(F)-16 flanged air release valve

Buy genuine YDK brass threaded air release valves at An Phú Thành

An Phu Thanh is the brand owner and direct distributor of YDK industrial valves in the Vietnamese market. When you buy the KAX(T)-16 brass threaded air release valve from An Phu Thanh, you receive:

• Genuine goods with proper documentation: Full CO, CQ, packing list, and VAT invoice.
• Large stock volume: All sizes DN15, DN20, and DN25 are in stock at our Ho Chi Minh City warehouse system, with fast nationwide delivery.
• Competitive discounts: Quotations directly from the OEM importer, with no commercial intermediaries.
• 12-month genuine warranty: Exchange and return support when a manufacturer defect is found.

To receive a detailed quotation and consultation on industrial valve and pipe fitting solutions for your project, please contact An Phu Thanh via Hotline/Zalo: 0946 729 913. Our experienced team is always ready to support you anytime, anywhere.