Design a helical compression spring for a pressure relief valve. When the valve is closed, the spring length is 2.0 in. and the spring force is to be 1.50 lb. As the pressure on the valve increases, a force of 14.0 lb causes the valve to open and compress the spring to a length of 1.25 in. Use corrosion-resistant ASTM A313. Type 302 steel wire, and design for average service.