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We have few GE frame 6 gas turbines. As usual HGPI & MI is carried out approx every 3 years. We check to ensure smooth stroking & carry out passing check of these valves. But we don't know the testing procedure & qualifying criteria of these valves. Can anybody help? GCV/SRV, Bleed valves, VA17-1 & VA17-5, VA-18, VA22, VA19.