The invention relates to a pressure relief device of a manual hydraulic pump for medical equipment. The upper end cover is fixedly sleeved to the upper end of the inner cylinder block, the lower end of the support rod moves through the upper end cover and then passes into the support rod cavity of the inner cylinder block； the upper end of the control rod is fixedly connected with the manual switch, the lower end of the control rod moves through the upper end cover and then passes into the inner cylinder block, and half of the sphere is fixed at the lower end of the control rod. The hemispherical body can be clamped in the sealing cone at the lower end of the inner cylinder control rod cavity to close or open the oil drain port.The lower end of the control rod is fixed with half of the sphere, and the hemispherical body can be clamped in the sealing cone at the lower end of the control rod cavity of the inner cylinder block to close or open the oil drain port. The control rod and the hemispherical body are integral components, and the control rod will not have a depression due to wear or pressure, so that the control rod can work more stably and reliably.本創作係關於一種醫療器材的手動液壓泵之洩壓裝置，一上端蓋固定套接在內缸體的上端，支撐桿的下端活動穿過上端蓋後穿入內缸體的支撐桿腔內；控制桿的上端與手動開關固定連接，控制桿的下端活動穿過上端蓋後穿入內缸體，在控制桿的下端固定一半球體，該半球體可卡置在內缸體控制桿腔下端的密封錐面內而將洩油口封閉或開啟。控制桿的下端固定一半球體，該半球體可卡置在內缸體控制桿腔下端的密封錐面內而將洩油口封閉或開啟，控制桿與半球體為一體構件，控制桿不會因磨損或壓力而產生凹陷，使控制桿工作更加穩定、可靠。
