Tire Valve Airtightness Compression Test
Cangzhou Shengshiweiye conducted a tire valve air tightness compression test. Slow tire leakage is one of the most common problems encountered by car owners in their daily use and after-sales of automotive parts. The vast majority of faults are not caused by tire damage, but by the failure of tire valve sealing performance. As the core component of tire pressure sealing, the tire valve is prone to slight leakage due to long-term exposure to alternating high and low temperatures, road vibrations, and UV aging. To avoid unstable tire pressure, abnormal wear, and high-speed safety hazards from the source, air tightness pressure testing is the most basic and critical testing process in automotive parts factory quality inspection, store after-sales maintenance, and tire replacement and maintenance.
Many small and medium-sized auto repair shops and auto parts manufacturers rely solely on simple soap water visual inspection for leak detection, which has poor accuracy and high leakage rates, making it impossible to identify micro leakage hazards. The standardized tire valve pressure air tightness test can accurately detect subtle air leakage problems at the valve body, root seal, and valve core connection, and is also a professional testing method that complies with national standards.
Why does the tire valve need to undergo an air tightness pressure test?
The tire valve appears to have a simple structure, but its sealing fault tolerance is extremely low, and hidden problems such as aging cracks, slight deformation of sealing gaskets, and assembly gaps cannot be recognized by the naked eye. Conventional visual inspection and simple soap water leak detection can only identify obvious air leakage faults, and are completely ineffective for low-speed and low-pressure micro leaks.
After the tire valve without pressure testing is installed and used, there will be continuous slow air leakage, which directly leads to tire pressure imbalance, tire wear, and increased fuel consumption. Long term driving will also significantly increase the risk of high-speed tire blowouts. Whether it is the factory quality inspection of new tire valves, the re inspection after tire disassembly and replacement, or the regular maintenance of old vehicles, standardized pressure testing is the core link to verify the sealing performance of tire valves and ensure driving safety.
Complete process of industry standard airtightness pressure testing
Referring to the national standard for tire valve testing, both civilian passenger cars and commercial vehicles use a unified pressure testing standard for tubeless valves. The entire process is standardized and the data is accurate, suitable for the entire scene of automotive parts production and after-sales service.
1. Pre assembly and fixation
Accurately install the tire valve to be tested on a specialized fixture for simulating wheel rims according to standard torque, fully replicate the actual assembly state of the vehicle, ensure that there are no gaps between the root of the tire valve and the wheel rim fitting surface, eliminate detection errors caused by loose assembly, and eliminate interference from human installation problems on the test results.
2. Standard pressure inflation and stabilization
Connect clean and dry compressed air or nitrogen, uniformly pressurize to the industry standard test pressure of 1400kPa, maintain stable pressure output, ensure that the valve is in the rated working pressure state as a whole, and simulate the real pressure conditions of daily high-speed and heavy-duty driving of vehicles.
3. Observation of leak detection by immersion and static placement
Immerse the assembled tire valve and fixture vertically into a clean water tank, keeping the valve opening facing upwards and the liquid level completely covering the valve base and sealing joint area. Let it stand and maintain pressure for 60 seconds. Observe the valve core, threaded interface, and root fitting for continuous air bubble overflow throughout the entire process. If no air bubbles are generated, the seal is considered qualified. If there are continuous air bubbles, it is determined that the air leakage has failed.
4. High and low temperature simulation retesting (advanced quality inspection)
Professional automotive parts factory quality inspection will add high and low temperature limit testing: after constant temperature treatment at 66 ℃ in high temperature environment and -40 ℃ in low temperature environment, pressure immersion testing will be conducted again to verify the sealing stability of the valve under extreme temperature difference, select qualified products that are resistant to aging and deformation, and adapt to complex road conditions and seasonal climate usage scenarios.
Common leakage points and fault causes in pressure testing
Through standardized pressure testing, the hidden danger of tire valve leakage can be accurately located. In daily testing, the fault points are highly concentrated and mainly divided into three categories:
1. Tire valve root leakage: It is mostly caused by rubber aging and hardening, assembly extrusion deformation, and sealing ring wear and loss, and is the most common micro leakage fault. Simple leak detection methods are extremely difficult to detect.
2. Leakage at the connection of the tire valve core: Loose valve core, aging sealing gasket, and slipping threads can cause sustained slow leakage, and the vehicle will experience a significant decrease in tire pressure after being idle for several days.
3. Leakage due to cracks in the valve body: Violent disassembly, long-term exposure to sunlight aging, and poor material quality can lead to subtle cracks in the valve body, causing slow air leakage under pressure and seriously affecting tire pressure stability.
The core value of suppression testing: adapting to both production and after-sales scenarios
For auto parts manufacturers, air tightness pressure testing is a necessary inspection process for products leaving the factory, which can strictly control the product qualification rate, prevent inferior tire valves from entering the market, and improve product durability and reputation.
For auto repair shops and car owners, adding a pressure tightness test every time tires are replaced, tire valves are disassembled, or tire pressure faults are checked can identify hidden air leakage hazards in advance, avoid rework and repair, solve the problem of slow tire leakage from the root, extend the service life of tires and tire valves, and reduce driving safety risks.
Tire valve air tightness pressure testing is the most professional and reliable testing method for verifying the sealing performance of tire valves, and it is also an indispensable standardized process in tire maintenance and automotive parts quality inspection. Abandoning the crude and simple leak detection method, strictly implementing the standard pressure testing process, and accurately identifying all potential air leakage hazards at the root, core, and interface can not only ensure long-term stability of tire pressure and reduce abnormal tire wear, but also comprehensively safeguard driving safety.