| 摘要 |
In a pump with precompression of the type comprising a hollow piston 20 with a valve 30 in the hollow portion, acted upon by a spring 4 ensuring the return of this assembly and the calibration of the valve, valve elements 61 or 71 are provided in the valve in order to allow easier filling of the pump chamber 50, 51, without forming a vacuum. Application to large-size pumps. <IMAGE>
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