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 thevacuum 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:

1,、Body 50000-80000 shots;

2,、 Front ring 5000-10000shots;

3、Back ring is front ring × 2-3