Abstract
There are many unsolved problemes about the strength of the shell and the leakage of valve seats of an industrial gate valve under pressure. This paper describes some results of the pressure test performed on a cast iron marine gate valve, JISF 7363.
Test was carried out by applying oil pressure inside the assembled valve with the end flanges capped, and the obturator was operated by turning the handwheel. The maximum oil pressure was about 2.5 times permissible working pressure. Strains of the inside and outside surfaces of the body wall, and the deflections of the bon-net flange on the axis of body neck were measured and investigated. Moreover, the effects of the handwheel operations affecting on the stress distributions, deflections, and seat contacts were examined.
