06
2025
-
10
Is the pneumatic connection unreliable? The issue with the handshake valve needs to be resolved first.
There is a key component in the air line connection between the tractor and the trailer — the quick coupling. Generally, the quick coupling that comes with the original tractor is a handshake-type coupling, which we usually call a handshake valve. There is also a plug-in type coupling, which many people simply call a quick coupling. Many of our users, after purchasing a new vehicle, will replace the original handshake valve on the tractor with a plug-in type coupling. Some trailers even come equipped with a plug-in type coupling right from the factory to reduce the hassle of modifications later on. Why is it that for some users, the handshake valve is so unpopular?● User: The plug-in type isn’t perfect, but the handshake valve is even less reassuring.
Plug-in Quick CouplerIn fact, compared to other types, the connection operation of a plug-in coupler is not actually that "quick." It is more suitable for users who do not frequently connect and disconnect, whereas handshake-type couplers are better suited for frequent connections and are more commonly used in trailer logistics.Furthermore, plug-in couplers are not vehicle-specific components. The air passage of this type of self-closing quick coupler is usually relatively small; also, if the plug-in coupler remains connected for a long time, it is prone to water accumulation and rust.Unreliable Air Line Connection? Fix the Handshake Valve Issue FirstSince plug-in couplers have these disadvantages, why use them at all? Some users say it is simply because they are more secure and leak-free, whereas handshake valves can sometimes be a bit troublesome in this regard.According to user feedback, some handshake couplers do not fit tightly and may leak air. There is even concern that they could detach when traveling over bumpy roads. Everyone knows the consequences of poor air supply—either it affects braking performance or causes trailer brakes to fail, both of which are serious situations.● Handshake Valves Do Not Distinguish Male or Female Ends; Connection and Installation Cannot Be Too CasualThere are usually two reasons for this issue: one is poor-quality or aging and damaged rubber gaskets, and the other is design and specification problems of the handshake coupler.
握手接头的连接状态
Unlike plug-in connectors, handshake joints are components specifically designed for the air line connection between tractors and trailers, and they have a special feature — all the joints are the same, with no distinction between male and female. It should be noted that common quick connectors are usually divided into male and female types, including plug-in connectors, seven-pin power connectors, ABS connectors, etc.When connecting, male and female connectors are easier to identify to see if they are properly installed, whereas handshake joints require careful alignment during installation; otherwise, the connection may not be secure and could even damage the rubber gasket.● Inconsistent production specifications lead to loose connections
Aside: In some foreign regions, the trailer handshake valve is customarily locked, and Guangdong also has other anti-theft devices. Due to this special design, it also requires relatively high production standards. Currently, the handshake couplings produced by different manufacturers use different molds, and the tolerance dimensions vary. Often, the tractor and trailer may use handshake couplings from different manufacturers, and differences can be noticed during connection.If the handshake coupling connection is found to be inconvenient, it is recommended to replace the paired couplings with high-quality products from the same brand.
It is necessary to establish unified and strict standards for these vehicle components. On one hand, they affect vehicle safety; on the other hand, they influence the development of the logistics industry. Currently, the development of domestic rental and shared trailers is constrained, and one reason is the issue of vehicle standardization.
Focus on the research and development of automotive brake systems and pneumatic brake valves to promote the development of the auto parts industry!
Contact Information
Telephone:86-575-87438928
Mobile:8613252110178
QQ：1185450863@qq.com
Address: No. 461, Advanced Village, Fengqiao Town, Zhuji, Zhejiang Province
Online message
Submit your information and we will contact you as soon as possible.