| 摘要 |
The invention relates to an improved adjusting screw of a door closer of the so-called hydraulic type, characterised in that it is suitable for any type of door closer and in that it combines, in a "one-piece" way, with a conventional adjustable leakage section the additional function of a valve opening under the effect of an "overpressure" beyond that which is normal and predetermined, then pushing back the ball 11 counter to the spring 12. <IMAGE>
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