The opening and closing of the electric butterfly valve is completely completed by the rotation of the hydraulic ring servo

The opening and closing of the electric butterfly valve is completely accomplished by the rotation of the hydraulic ring servo. The power of the butterfly valve hydraulic ring relay mainly comes from the hydraulic system. The hydraulic operating system consists of two pressure oil pumps, oil valves, hydraulic valves, four-way spool valves and oil pipelines. The hydraulic annular relay consists of a butterfly valve main shaft, an annular cylinder, a piston, an action arm, a split half key, a sub-chamber partition and an oil inlet and outlet. The butterfly valve is integrated with the main shaft, and the main shaft is connected to the action arm by a half key. Under the action of pressure oil, the hydraulic annular relay is driven by the main shaft of the butterfly valve as the center of rotation of the butterfly valve, and then moves through the annular cylinder. Then the arm of the butterfly valve is rotated by the action arm connected to the piston. The spindle drives the shutter to rotate, thereby opening and closing the butterfly valve. the goal of.

 The butterfly valve's opening and closing process chooses the hydraulic ring relay to operate because the hydraulic ring relay has the outstanding advantage: in the fixed-axis rotary transmission, the straight-cylinder servo drive start zone and limit zone can be overcome. The disadvantage that the force arm is shortened and the force is dispersed. However, the relative position of the annular servo cylinder and the butterfly valve main shaft, that is, the center of the annular cylinder and the concentricity of the butterfly valve main shaft, the circular center plane of the cylinder and the axis of the butterfly valve spindle are difficult to manufacture and install. Guaranteed.
 
     In the process of reforming the butterfly valve hydraulic ring relay, the connection form of the action arm and the piston is mainly changed from a rigid connection to an elastic connection, so that the piston can automatically generate radial displacement during the movement along the annular cylinder. The arm can be used to prevent the rigidity of the arm from being automatically adjusted in the manufacturing and installation, and the working performance of the hydraulic ring relay is improved, and satisfactory results are obtained.
 

     Due to processing limitations, the thrust plate on the piston is primarily machined. The thrust plate is matched with the shaft and the hole of the action arm, and the original transition fit is changed into a dynamic fit to ensure that the radial displacement of the thrust plate is greater than or equal to 2 mm, and the six M16 screw holes of the axial end of the support arm are still utilized. , increase the thrust plate and the action arm connection; the clearance between the quasi 20 of the bolt 2 and the hole Φ30 should be less than 2.5mm, and the axial clearance is 0.05~0.1mm, so as to ensure that the piston moves in the radial direction without both resistance and The axial displacement is controlled, and the sealing cover 1 and the sealing pad 3 are pressed by the screw and the thrust plate to form a sealing device.