Abstract
While control valves are used in many plants, most of the breakdown problems occur due to leakage of working fluid from grand packing. The primary cause of the leakage is stress relaxation of the grand packing. In this research, we proposed new method of measuring pressure of grand packing to evaluate mechanical properties of the grand packing. First, we verified that measurement of the radial pressure distribution is possible by using grease and pressure sensors for fluid. Next, making use of the method, a measuring device based on actual valve was developed, which can measure the axial pressure and the radial pressure distribution of grand packing simultaneously. Therefore, experimental results showed that the radial pressure is high as upper and the relation between the radial pressure and the axial pressure is proportional.
