There are many factors that affect orifice. 

1: First, consider the water quality. Normally, tap water can basically meet the needs of waterjet cutting, but it is not very good, because tap water has many physical particles and chemical substances in it, which will shorten the service life of the waterjet orifice. 

2: The quality of orifice. There is a big difference between different brands. Choosing a good brand is the key to ensuring quality. 

3: The number of holes for cutting materials. This can be calculated as the number of times the water valve is turned on and off per unit time. The more times the water valve is turned on and off, the shorter the service life of the orifice. Because the impact force of the orifice is repeated, so this is also a major factor affecting the life of orifice.