The working principle of the Vacuum self-compensating plunger(Patented)is that the open copper ring is always in the"open"tendency under the acting force of the built-in spring,so that the wear of the outer diameter of the copper ring is auto-matically compensated by the"expand-ing"of the ring,always allowing the outer circumference of the copper ring and the inner wall of the shot sleeve stay in a tight state,hermetically seals the inner cham-ber of the shot sleeve to achieve the vacuum sealing e?ect and increase:

 

　　Single ring vacuum self-compensating plunger

 

　　Double ring vacuum self-compensating plunger

 

　　Four ring vacuum self-compensating plunger

 

　　PRODUCT STRUCTURE：

 

　　Component life:

 

　　Body 50000-80000 shots；Front ring 5000-10000shots；Back ring is front ring×2-3。