The ILG/S is a manual override quar

The ILG/S is a manual override quarter turn gearbox for single acting pneumatic or electric actuators.For maximum allowable input- and outputtorque, refer to table 1 or the (not included) datasheet. This manual describes the installation of the gearbox and its parts. The purpose from the ILG/S gearbox is to open a valve with the gearbox in case of a failing actuator system. If the power supply fails the spring returns the actuator (and valve) to the “secure” (closed) position.1. The gearbox is standard delivered in closed position.2. It is recommended to mount a handwheel on the inputshaft prior to assembling the gearbox to the valve. 3. Check if the boltcircle of the flanges (of gearbox and valve) coincide. Also check if the valvestem and the bore of the driveshaft match. 4. Make sure the valve is in the fully closed position. If not, close the valve before continuing.5. For fail-close actuators (90° clockwise close), the gearbox has to be positioned fully closed. This is achieved by turning the handwheel clockwise.6. In case of use of studbolts for fixing the gearbox to the valve, it is recommended to screw them into the bottomflange of the gearbox prior to mounting the gearbox on top of the valve.7. The use of a gasket between the flange of the valve and gearbox is recommended.