| 摘要 |
A drain valve for a hydraulic shock absorber particularly for use on a large hydraulic press, includes a drain passage carried on a plunger member which is moved downwardly with the movable machine element such as a guide plunger of a press crosshead. The passage defines a valve seat which is closed by a valve disc of relatively great mass under the action of a preset biasing spring. The mass of the valve disc is such that, during a shock movement of the crosshead and the supporting plunger therefor causing a fast movement of the plunger, the seat will move away from the valve disc mass because of the large mass movement of inertia of the disc, and permit flow through the drain valve passage. The plunger will gradually absorb the shock as the fluid in its associated cylinder is displaced out of the drain passage.
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