In the low pressure cut-off valve is generally low in higher, truncation packing don't stress, reduce the rate of leakage, can prolong service life.
The cut-off valve of general > DNA100 can use high in low out; Large diameter and high pressure condition with low into higher close the valve more difficult, because if with low and high pressure, large diameter condition into the higher, the valve stem long water pressure easy to bending deformation, affect the safety of the valve and seal; Three is to choose high into the lower in stem diameter can dot, for manufacturers and users will save some cost.
