In the hot water heating system, there is often air in the embassy due to the evaporation and cooling of water. Since the system is usually closed, the air cannot be discharged from the piping system, causing air plugs, which affect the heat dissipation and circulation of the heating system. Usually, it is used in the piping system. Set an exhaust valve at the top of the valve to solve the problem. Chinese Patent No. 87209560 announced an automatic sensitive exhaust valve. A vacuum floating ball is set in the valve body. The floating ball is a glass floating ball. The air hole is opened and closed by the bump on the top of the floating ball. Although the exhaust valve of this result can remove the air in the pipeline system, because the bump and the air outlet are often misaligned and the exhaust is not sensitive, it also causes water to overflow. Due to the many debris inside the pipeline, if the debris enters the valve body, it will block the exhaust port or hinder the movement of the floating ball. If the debris gets stuck in the seal, it will easily lead to exhaust and drainage, and the introduction of floods will waste a lot of water, thus affecting the drainage. The normal operation of the air valve also adopts single seal and single exhaust. When the exhaust valve enters water, the floating ball controls the sealing surface, but the pipeline is often impacted by water and will accumulate secondary air. At this time, the secondary air cannot be realized. Exhaust will cause the pipeline to break easily if the gas is not exhausted, and damage the water appliances, resulting in large economic losses for users and unsatisfactory use effects
[0004] At present, the Chinese patent number ZL 201220317289.6 has announced a double-port exhaust valve, which includes a valve body, a valve stem and a valve disc. The lower part of the valve body is provided with a valve port for gas and fluid to enter. There is a valve cover directly above the valve port, the valve disc can be opened and closed on the valve port, and the valve stem can be lifted up and down in the valve body, one end of which is fixedly connected with the valve disc, and the other end extends out of the valve cover Connected with the driving device, the left and right sides of the valve body are respectively provided with left and right exhaust chambers connected with the valve port, and the left and right exhaust chambers are respectively equipped with floating balls that can float up and down. The valve body is located above the left and right exhaust chambers and is also provided with an exhaust end cover respectively, and each exhaust end cover is respectively provided with an exhaust port, and the valve body is located between the exhaust end cover and the valve cover. The upper part is also equipped with a protective cover, and there is a gap for the gas to flow out between the protective cover and the two exhaust end covers. The valve body is located inside the circumference of the valve port and is provided with a filter. There is a filter on the inside, which can realize the filtering function. Since the filter fails to block the valve body, the filter is easy to fall off and fall into the pipeline, and finally cannot perform the filtering function, resulting in the filtering function not being durable and having a short service life. The design of the filter is unreasonable. This kind of phenomenon has already appeared in some parts of the market. Users often report that the scope of application of this prior art is limited and it can only be used on larger pipelines. It is not suitable for small pipelines and is a waste of cost. , and this patented technology can be installed and used in large or small pipelines, and it also adopts single seal and double exhaust. When the exhaust valve enters water, the floating ball controls the sealing surface, but the pipeline is often impacted by water and will produce If the secondary air is accumulated, the secondary exhaust cannot be realized at this time, which will cause the pipeline to be easily broken due to the exhaustion of the gas, and the water appliances will be damaged, which will also cause a large loss to the user's economy, and the use effect is also unsatisfactory. The above-mentioned In the prior art, no buffer spring is designed above the floating ball. When the water enters the floating ball, the impact force is relatively large, resulting in frequent damage to the floating ball, short service life, and loss of exhaust function. The exhaust valve must be replaced frequently. Can not bring good economic benefits to users