Water jet cutting machine can not be smooth in cutting process, sand valve sometimes will produce sand breaking situation, at this time to check the negative pressure meter, if the negative pressure is obviously lower than the adjusted value, then may be in the outlet of the sand box nut throttling end of the accumulation of impurities.
This situation can open the nut of the welded pipe joint directly, put the sand control valve down, and then use the screwdriver to remove the throttle seat, and the general impurities will flow out along with the pomegranate sand. If it still doesn't work, it may be due to too much or too much accumulated debris, which requires removing the sandbox to clear up the debris.
If the negative pressure gauge of the water cutting machine does not have negative pressure, it is usually caused by foreign matter or excessive pomegranate sand accumulated in the water knife sand control valve body to the sand conveying pipe joint. The scavenging procedure of this situation is more complicated and needs to be removed from the joint of the sand valve, the sand conveying pipe and the sand conveying pipe, and then cleaned with high pressure gas so that the equipment can be restored to normal.