of resilient device biases the pressure isolation piston 76 in an opposite e g leftward direction as illustrated in fig7 the pressure isolation piston 76 continues to translate in this opposite direction within the valve block 78 until a fluid pathway is established between the oil chamber 66 and one side of piston 52 as represented by arrows 90 consequently the actuator 50 is moved to open or otherwise actuate the valve 38 under the pressure of liquid 68 liquid 68 is again acted on by compensating piston 64 which moves as a result of the formation pressure or other suitable pressure one advantage of such a system is that tubing pressure is removed from one side of the valve 38 prior to opening the valve this provides the ability to prevent or inhibit a fluid shock from being delivered to the formation upon the opening of the valve 38 referring generally to fig8 10 another embodiment of the valve 38 and its trip saver module 36 is illustrated in this embodiment the trip saver module 36 is designed to utilize an indexing trigger device 92 which is set to actuate upon a predetermined number of tubing pressure cycles in the illustrated example the indexing trigger device 92 is part of trip saver component 70.