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公开(公告)号：US5285027A
公开(公告)日：1994-02-08
申请号：US843163
申请日：1992-02-28
CPC分类号： B66B1/24
摘要： A hydraulic elevator comprises a car, a hydraulic jack to drive the car, a hydraulic pump, and control means for controlling a flow rate of fluid flowing to or from the hydraulic jack thereby to control movement of the car. The control means comprises a main valve constructed so as to allow fluid the flow from the pump into the hydraulic jack when a pressure of the fluid is higher than a predetermined value thereby to effect upward running of the car, and to check a fluid flow from the hydraulic jack when the pressure of the fluid from the pump is less than the predetermined value, and valve control means including a plurality of pilot valves for controlling, when the pressure of the fluid from the pump is less than the value, the main valve to open and close, and wherein the valve control means controls the closing operation of the main valve along at least two different patterns.
摘要翻译： 液压升降机包括轿厢，用于驱动汽车的液压千斤顶，液压泵以及用于控制流入或流出液压千斤顶的流体流量的控制装置，从而控制汽车的运动。 控制装置包括主阀，其构造成当流体的压力高于预定值时允许流体从泵进入液压千斤顶的流体，从而实现汽车的向上运动，并且检查来自 当来自泵的流体的压力小于预定值时的液压千斤顶，并且阀控制装置包括多个先导阀，用于当来自泵的流体的压力小于该值时控制主阀 以打开和关闭，并且其中所述阀控制装置沿至少两种不同的模式控制所述主阀的关闭操作。
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公开(公告)号：US4909279A
公开(公告)日：1990-03-20
申请号：US377766
申请日：1989-07-10
申请人： Ichiro Nakamura , Katsuharu Shuto , Eiichi Sasaki
发明人： Ichiro Nakamura , Katsuharu Shuto , Eiichi Sasaki
CPC分类号： B66B1/24 , Y10T137/87177 , Y10T137/87861 , Y10T137/87893
摘要： In a fluid control valve, a check valve is provided between the pump port and the first fluid chamber and allows the fluid to pass therethrough only in a direction from the pump port to the first fluid chamber, a down control valve is provided between the first fluid chamber and the second fluid chamber, an up control valve is provided between the first fluid chamber and the third fluid chamber, the fluid is allowed to flow from the pump port to the cylinder port through the check valve and through the down control valve when they are opened, and the fluid from the cylinder port to the tank port is allowed to flow through the down control valve, through the first fluid chamber and through the up control valve when they are opened. The fluid control valve can be obtained simple in structure and high in precision, and be allowed a reduction in cavitation and noise.
摘要翻译： 在流体控制阀中，止回阀设置在泵口和第一流体室之间，并且允许流体仅在从泵口到第一流体室的方向上通过，下降控制阀设置在第一 流体室和第二流体室，在第一流体室和第三流体室之间设置有上调控制阀，通过止回阀和通过下降控制阀允许流体从泵口流到气缸端口， 它们被打开，并且允许从气缸端口到罐口的流体通过下压控制阀通过第一流体室并且当它们打开时通过上调控制阀。 流体控制阀的结构简单，精度高，可以减少气蚀和噪音。
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