Design of Release Valve

The poppet valve is made tighter to compress the spring and push the ball which pushes fluid out.

This valve is against spring force and pressure force.

Where, t = human force F_s = spring force

F_f = force due to the fluid

Consideration, Shear area = 12.7 mm²

Tensile strength area = 14.2 mm²

Material selection

• Course pitch threaded
• Cast iron
• Tensile strength 221Mpa

Design analysis

From above force of spring F_s = 260N.

 Where, T = human torque

J = shear stress

τ = shear stress

J = polar moment of inertia

d = valve diameter

 Where d = core diameter 

Take diameter to be d = 8 mm

T = f × l = 260N × 450= 117 Nm

D/2 = (F_s× F_f)=T    consider F_f = 320

 D = 15.84mm

Take the diameter of the head to be 16 mm D = 16mm.

Check strength against compression due to fluid pressure and spring force,