Reliability Study of Constant Pressure Delivery Valve in Fuel Injection System

With the example of constant pressure delivery valve in PW2000 pump of Weifu Group Company,by components reliability design,manufacturing processes improvement,parameters optimizing calculation and detailed analysis,the reliability quality research,design and improvement for this valve under high injection pressure and intensified condition were carried out.Results show that,according to the actual intensity level of fuel injection system and performance requirements,throgh redesign and manufacturing processes modification,such as regulation of opening pressure of fuel returning valve,the seat angle of the fuel returning valve holder,the lift control of the fuel returning valve, the parameter optimization of the spring,carefully design of the up-seat and bowl-seat,improvement of the surface roughness and so on,the reliability quality of the constant delivery valve can be greatly improved.