A spring is to be designed to fit over a valve rod of 15 mmdiameter as shown in figure Q2. The forces acting on the springwhile closing and opening of the valve are F1 and F2 respectively.Using the data given table Q2 and assuming that spring has squaredand ground ends,
Determine:
(i) Wire diameter of spring
(ii) Outside diameter of spring  Â
(iii) Number of turns  Â
(iv) Stiffness of spring
(v) Free length  Â
(vi) Pitch  Â
(vii) If this spring is cut into two springs having equalnumber of turns, determine the spring stiffness of each resultingsprings  Â
(viii) Discuss the load carrying capacity of the resulting twosprings when used in parallel compared with that of the originalspring
40 N Length of spring when valve is open:
30 N Length of spring when valve is closed :
15 mm Diameter of valve rod:
6 Spring index :
1400N/mm2 Ultimate tensile strength :
82000 MPa Modulus of rigidity:
30% ultimate tensile strength Shear Stress :
200 N Force (F1) when the valve closes :
300 N Force (F2) when the valve open :
