2. The dome pressure (at depth) for a bellows operated unbalanced gas lift valve is 710 psi. Ap is 0.05 inches. Ab is 0.5 inches. The producing pressure is 500 psi (10 points). a) What is the theoretical closing pressure of the valve? b) What is the theoretical injection pressure needed to open the valve? c) What is the valve spread? d) If the injection pressure is 525 psi, is the valve open or closed? e) If the injection pressure is 620 psi, is the valve open or closed? f) If the injection pressure is 720 psi, is the valve open or closed?