Question

Design a helical spring for a spring loaded safety valve for the following conditions: Operating pressure= 1 N/mm Maximum pressure when the valve blows off freely 1.075 N/mm Maximum lift of the valve when the pressure is 1.075 N/mm2 = 6 mm Diameter of valve seat 100 mm Maximum shear stress 400 MPa Modulus of rigidity 86 kN/mm2 Spring index= 5.5

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