手压泵底阀,常因下面垫有砂粒等杂物使密封不严而漏气,下次抽水时仍须再加引水。为了解决这个问题,改进如图,使缸底下的焊接短管往上伸出一小段,高度h应大于砂粒直径的1.5倍,一般可取10毫米,尺寸b可取5毫米或更小一点,但需注意伸出段的上平面必须平整光洁。由于密封环面上压力增加;水的流速相应 Hand pressure pump at the end of the valve, often due to sand and other debris under the pad so that the seal is not strict and leaks, the next time pumping still have to add water. In order to solve this problem, as shown in the figure, the welding short pipe under the cylinder should protrude upwards for a short time, the height h should be more than 1.5 times of the diameter of the sand, generally 10mm, the size b may be 5mm or smaller, Note that the extension of the plane must be flat and smooth. Due to the increased pressure on the sealing ring surface, the flow rate of water corresponds