Experimental Investigation of Lift Coefficient for a Spring-loaded Pressure Safety Valve

As the essential part of a pressure system, the pressure safety valve (PSV) is widely used in the fields of chemical industry and nuclear power. However, few closely attention have been paid on the life coefficient of valve disc. Therefore, a measurement system of safety valves hat been established for investigating the influence of different positions of disc and the load cell is used to measure the lift force of valve disc. Specially, the micrometer mechanism and the laser displacement sensor which can improve the precision of the adjustment of the position of disc, have been used for the feed and feedback. Besides cantrolling the NI-DAQ for real-time data acquisition, the data acquisition system programmed by Lab VIEW also can achieve the data processing. And compared with the experimental results, it is shown that the measurement system has strong repeatability and can reasonably capture the lift force under different pressures and positions of valve disc.