Jinan Worldwide Auto-Accessory Limited (previously named as Jinan Auto Accessory Factory) is a professional manufacturer of engine valves and tappets. Through continuous efforts and innovation, Jinan Worldwide has become the largest domestic company that is engaged in production and distribution of auto engine valves and tappets from a small workshop. “China First” has been created consecutively by Jinan Worldwide in 62 years since its inception in 1956. 

1. The first company to adopt electric upset forging technology

Jinan Worldwide successfully developed the first single-station horizontal valve blank electric upsetting machine in 1965 in cooperation with Institute of Casting and Forging Machinery of First Ministry of Machinery Industry. The first semi-automatic six-station electric upsetting machine was also developed by Jinan Worldwide two years later. The electric upsetting technology has greatly improved working environment, reduced labor intensity, improved product quality, and promoted the rapid development of valve production in China. 

2. The first company to introduce Friction Welding Machine

Jinan Worldwide successfully welded two different metals by using flash welding technology to realize substantial cost reduction in 1970s. In the meantime the company took the lead in developing more advance friction welding technology and imported the first friction welding machine at the beginning of 1980s. Friction welding technology was then adopted in producing many engine valves including BJ213, Santana, Cummins and Steyr, etc. 

3. First time to use austenite steel

Jinan Worldwide planned a material transition from martensite steel to austenite steel in 1978. The technicians successfully developed production technology for 21-4N austenite steel engine valve in the next year. The company doubled the output of engine valves in 1980s by using this technology. Manufacturing technology of austenitic heat-resistant stainless steel valve was rewarded Second Prize for Science & technology Progress of China Automotive Industry in 1992. 

4. The first conical overlaying welding equipment

Jinan Worldwide first developed alloy surfacing process for valve conical surface in China and manufactured plasma valve conical surfacing machine in 1980s. This technology took place traditional manual oxyacetylene surfacing welding and automatic oxyacetylene welding. Plasma arc powder surfacing technology can be regarded as a subversive technological revolution in Chinese engine valve industry as it greatly improved labor efficiency. Currently most production lines of the company are composed of self-developed equipment. 

5. The first hollow sodium-filled engine valve

At the request of Shanghai Volkswagen and FAW Volkswagen, Jinan Worldwide developed the first domestic hollow sodium-filled engine valve in 1998 and filled the gap in this field. The technical conditions for sodium, zirconium, surfacing material P37S and finished product inspection standards of sodium-filled engine valve are all formulated by Jinan Worldwide.