Optimization of turning parameters to control concentricity of globe plug check valve

Globe plug check valve is a hydraulic valve highly used in process industries such as chemical, dairy, food etc. to allow flow of fluid in right direction and to maintain pressure of the system. For the functioning of any valve it should manufactured with both dimensional and geometrical accuracy to prevent the possible leakage of the assembly, which in turn affects the pressure of the system. In globe plug check valves, it was found that concentricity plays a major role on the functioning of the valve. Most of the globe plug check valve components are manufactured by turning operation on CNC machine. So the concentricity of the produced valve components are influenced the factors of turning process. This work is depicts the effect of concentricity on leakage of globe plug check valve and how concentricity can be improved by controlling the factors of turning. Here, design of valve components are modified, according to the GD&T standards, specifying the geometric requirements to ensure leak free assembly. Design of experiment along with grey relation analysis are carried out to optimize turning parameters influencing concentricity. ANOVA is used to check the effect of individual factors of turning on the concentricity and found that optimum turned parameter for male part (globe plug) is Cutting Speed = 140 (m/min.), feed = 0.05(mm/rev.) and depth of cut = 0.2 (mm) and for body part it is Cutting Speed = 140 (m/min.), feed = 0.1(mm/rev.) and depth of cut = 0.3 (mm).