Gas -liquid linkage jar

The utility model discloses a gas -liquid linkage jar, including outer shell, inner casing, needle valve and check valve dam, the outer shell includes outer cylinder and outer piston, outer cylinder quilt the outer piston divide into first air cavity and first oil pocket, the inner casing includes inner cylinder tube, piston rod and inner piston, the inner cylinder tube quilt the inner piston divide into second air cavity and second oil pocket, the piston rod is located in the second air cavity, first oil pocket with the second oil pocket passes through dam the needle valve with the check valve intercommunication, oil passes through the needle valve that dams is followed first oil pocket flows in the second oil pocket, through the check valve is followed the second oil pocket flows in first oil pocket. Because it is as an organic whole to integrate cylinder and hydro -cylinder, gas -liquid linkage jar's whole volume has been reduced for the occasion that is suitable for is more extensive. The benefit hydro -c