A HYDRAULIC ROTARY VANE VALVE ACTUATOR, FOR OPEN/CLOSE OPERATION OF BALL, PLUG AND BUTTERFLY VALVES OR OTHER 90 DEGREE ROTATION EQUIPMENT. THE ACTUATOR IS TYPICALLY USED ON GAS OR OIL PIPELINES. IT IS TYPICALLY POWERED BY NATURAL GAS USING GAS OVER OIL TANKS BUT CAN BE POWERED HYDRAULICALLY OR BY NITROGEN STORAGE VESSELS. OPPOSITE CHAMBERS IN THE ACTUATOR ARE CONNECTED BY PRESSURE EQUALISING PASSAGES IN THE UPPER AND LOWER HEADS. IN THIS MANNER, THE ACTUATOR PRODUCES PERFECTLY BALANCED TORQUE AS HYDRAULIC FORCE SIMULTANEOUSLY PUSHES BOTH OF THE ROTOR VANES AWAY FROM THE STATIONARY SHOES. TORQUE OUTPUT OF THE ROTARY VANE ACTUATOR REMAINS CONSTANT THROUGHOUT THE FULL ROTATION OF THE VALVE.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING:- GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 8412 FOR OTHER ENGINES AND MOTORS GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 841229 FOR HYDRAULIC POWER ENGINES AND MOTORS, OTHER THAN LINEAR ACTING CYLINDERS CN CODE 84122989 FOR OTHER THAN HYDRAULIC SYSTEMS OR HYDRAULIC FLUID POWER MOTORS TARIC 8412298990 FOR OTHER THAN FOR USE IN CIVIL AIRCRAFT ALSO CLASSIFIED IN ACCORDANCE WITH: HARMONISED SYSTEM EXPLANATORY NOTES (HSEN) (B) 4 TO HEADING 8412