| 摘要 |
PURPOSE: A bi-directional check valve for a hydraulic system is provided to shut off flowing of fluids when fluid pressure of one direction goes down under an estimated value. CONSTITUTION: A valve body has an openings(116), a further opening(117) and a passage(115) connecting the opening and the further opening. A poppet(106) is disposed within the passage of the valve body, and a spring(105) is coupled to the poppet. A further poppet is disposed within the passage formed in the first poppet, and a further spring is coupled to the poppet and to the further poppet. When fluid passing through the opening gives to the poppet force that is greater than the spring force, the further portion of the outer surface of the poppet is directed away from the further portion of the wall of the passage. The opening permits the fluid to flow from the opening through a channel toward another opening of the valve body. When fluid passing through the further opening gives on the further poppet force that is greater than the further spring force, the further portion of the outer surface of the further poppet is directed away from the further opening to open a further channel in the poppet. The opening permits the fluid to flow from the further opening in the valve body through the further channel, at least one opening in the further poppet, a further passage in the further poppet, a further opening in the further poppet and an opening in the poppet to the opening of the valve body.
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