| 摘要 |
A metal plunger tip has a forward generally cylindrical section having a leading relatively flat forward end and enlarging at its rearward end to a first land. A middle generally circular threaded section spans between the first land and a second generally larger land at its rearward section. A rearward generally cylindrical section of larger diameter spans between the second land a its rear surface that terminates with a section for attachment to an externally threaded push rod. There is an interior cooling cavity in the plunger tip terminating with a rear internally threaded section for mating with an externally threaded push rod. The metal plunger tip can be made from beryllium copper. The metal plunger tip may have a leading chamfered edge. A metal wear ring can be screwed onto the metal plunger tip.
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