hydraulic system 2 and hydraulic system 3 are separated by isolation valve 82 sealed by o ring 14 and o ring 15 with the packer c not set the isolation valve 82 is pressure balanced pressure from hydraulic system 2 acts upward on an area equal to the difference in the seal bore where o ring 14 seals and the seal bore where o ring 15 seals rathole pressure from hydraulic system 3 acts on isolation valve 82 in three places hydraulic system 3 pressure acts downward on an area equal to the difference in the area of the sealing surface of o ring 21 and the area of the sealing surface for o ring 15 hydraulic system 3 pressure acts downward from the sealing surface for o ring 21 to the outer diameter of the isolation valve 82 and upward from the sealing surface of o ring 14 to the outer diameter of the isolation valve 82 summing these areas as long as the packer c is not set or the annular pressure above the packer is equal to the rathole pressure below the packer there is no hydraulic force applied to the isolation valve 82 referring to fig6 a 6b the production valve d is illustrated fig6 c illustrates a cross section of the production valve d taken along section lines 6c 6c of fig6 b in fig6 a 6b the production valve assembly d like the tube receptacle assembly b contains a debris trap 3 which consists of port 33 circular passage 34 circular passage 35 and circular passage 36 the debris trap 3 utilizes the difference in densities of the hydraulic oil and wellbore fluid to prevent debris from entering the.