| 摘要 |
PURPOSE:To make the oil sucking function of a hydraulic pump smooth at the start, by providing an air vent valve for opening/closing an air vent conducting to the delivery port of said pump. CONSTITUTION:When rotating a nut 46 of an air vent valve 5 and shifting said valve 5 in the direction A, a space is formed between the tip section 5a of said valve 5 and a valve seat 45a of an air vent 45 thereby the air remaining in a compression chamber 31 or a delivery port 32 is discharged by the oil pressure due to the head H through a conducting hole 5c of said valve 5 and a hollow hole 5b to the outside. Immediately after discharge, the nut 46 of said valve 5 is rotated reversely to block the conduction of the air vent 45 to the outside. |
