{"id":14894,"date":"2026-10-06T06:16:33","date_gmt":"2026-10-06T06:16:33","guid":{"rendered":"https:\/\/anphuthanhvalve.com\/?post_type=product&p=14894"},"modified":"2026-10-06T06:23:07","modified_gmt":"2026-10-06T06:23:07","slug":"ydk-cast-iron-threaded-air-release-valve-kaxt","status":"publish","type":"product","link":"https:\/\/anphuthanhvalve.com\/en\/ydk-cast-iron-threaded-air-release-valve-kaxt\/","title":{"rendered":"YDK CAST IRON THREADED AIR RELEASE VALVE – MODEL: KAX(T)"},"content":{"rendered":"

In water supply and drainage, HVAC, fire protection, and industrial piping systems, the build-up of air pockets obstructs the flow, reduces pump efficiency, and creates a risk of hydraulic shock. To avoid these problems, the YDK cast iron threaded air release valve, Model KAX(T)<\/strong>, is installed on piping systems. This is a simple float-operated valve that releases air automatically without letting the fluid escape.<\/p>\n

With its convenient threaded connection, the valve can be installed quickly and removed easily for replacement.<\/p>\n

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The YDK cast iron threaded air release valve, Model KAX(T)<\/figcaption><\/figure>\n

Construction and material table of the YDK cast iron threaded air release valve KAX(T)<\/h2>\n

The YDK cast iron threaded air release valve, Model KAX(T), is made up of 10 main parts, ensuring the automatic open\/close function that vents excess air to the outside.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
No.<\/th>\nComponent<\/th>\nMaterial<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nBody<\/td>\nDuctile iron GGG50<\/td>\nMain pressure-bearing shell, houses the float chamber, threaded connection to the pipeline<\/td>\n<\/tr>\n
2<\/td>\nFloat ball<\/td>\nABS<\/td>\nThe “floating ball” itself, which rises\/sinks with the water level to close\/open the air vent<\/td>\n<\/tr>\n
3<\/td>\nStem<\/td>\nCarbon steel<\/td>\nShaft that holds and positions the internal assembly<\/td>\n<\/tr>\n
4<\/td>\nWasher<\/td>\nCarbon steel<\/td>\nStop washer, distributes the tightening force evenly<\/td>\n<\/tr>\n
5<\/td>\nO-ring<\/td>\nEPDM<\/td>\nSeals the joints, preventing air\/water leakage<\/td>\n<\/tr>\n
6<\/td>\nVent cover<\/td>\nDuctile iron GGG50<\/td>\nUpper cover that protects the float assembly and the open\/close mechanism<\/td>\n<\/tr>\n
7<\/td>\nHex bolt<\/td>\nA2-70 (stainless steel 304)<\/td>\nTightens the cover to the body, with good corrosion resistance<\/td>\n<\/tr>\n
8<\/td>\nGasket<\/td>\nEPDM<\/td>\nSeals the flange face between the cover and the body<\/td>\n<\/tr>\n
9<\/td>\nCap<\/td>\nBrass<\/td>\nProtective cap on top of the valve, removable for inspection\/maintenance of the internal air release mechanism<\/td>\n<\/tr>\n
10<\/td>\nSeat<\/td>\nEPDM<\/td>\nSeating surface against which the float ball presses when closing; determines the tightness of the valve and prevents water leakage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Dimension table of the YDK cast iron threaded air release valve, Model KAX(T)<\/p>\n

\n\n\n\n\n\n\n\n\n
DN<\/th>\nH (Height \u2013 mm)<\/th>\nD (Diameter \u2013 mm)<\/th>\n<\/tr>\n<\/thead>\n
15<\/td>\n120<\/td>\n88<\/td>\n<\/tr>\n
20<\/td>\n120<\/td>\n88<\/td>\n<\/tr>\n
25<\/td>\n145<\/td>\n105<\/td>\n<\/tr>\n
32<\/td>\n145<\/td>\n105<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Operating principle of the YDK cast iron threaded air release valve<\/h2>\n

The YDK KAX(T) single float air release valve operates by a fully automatic mechanical mechanism. When the valve chamber contains no liquid, the float sits in its low position and the valve is open, allowing air to escape freely to the outside.<\/p>\n

When liquid enters the valve chamber, the buoyant force (Archimedes’ principle) acting on the float makes it move to the upper position, where it contacts and presses against the valve seat, performing the sealing function and preventing the liquid from escaping.<\/p>\n

The closing\/opening process takes place continuously and automatically throughout the operating cycle, meeting the requirement of venting accumulated air from the piping system without losing any liquid.<\/p>\n

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Air release valves are typically installed at high points along pipelines.<\/figcaption><\/figure>\n

Installation locations and operating notes for the cast iron threaded air release valve<\/h2>\n

Installation locations of air release valves in the system<\/h3>\n

The valve should be installed at the local high points of the piping system, where air tends to accumulate because of its density difference from the liquid. For pipelines with continuously changing elevation, multiple air release points should be provided, one for each local high point, rather than being limited to a single location.<\/p>\n

In fire protection systems, common installation locations for air release valves<\/a> are the tops of vertical risers and the area near the water supply inlet to the sprinkler system.<\/p>\n

In domestic and industrial water supply systems, common installation locations for the YDK cast iron threaded air release valve are after the pumping station and on pipe sections that rise through the floors of a building.<\/p>\n

Mandatory installation orientation requirement:<\/strong> The valve must be installed vertically, with the valve head pointing upward, so that the float mechanism works correctly according to the principles of gravity and buoyancy. Installing it tilted or horizontally will distort the float’s path of movement, causing the valve to lose its automatic open\/close function.<\/p>\n