| 摘要 |
A hydraulic oil tank connects to a valve head (10) which is provided with an oil return switch (2) accomodated in an oil return hole (14). An adjusting valve (3) is accomodated in an adjusting hole (13) of the valve head. An oil chamber hole (15) accomodates a check valve (4). A pivot rod hole (11) accomodates a pivot rod (5) and a pump hole (12) accomodates a pump (6). The check valve is in fluid communication with a conduit (8) which, for example, connects to a tube of a hydraulic jack. The valve head allows hydraulic fluid to be imparted to a jack at a controlled, desired pressure and allows advantageous return of fluid to the oil tank.
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