The ILG-D series manual gearboxes are designed to manually operate pneumatically operated valves in applications. These gearboxes are intended for use with double-acting actuators and are disengageable for manual operation. To ensure a long service life, the housing is sealed to IP65 and the input shaft is made of protected steel. The manual gearboxes of the ILG-D series are used in all industrial sectors where reliable manual operation of double-acting actuators is required. All units are mounted between the actuator and the valve and can be supplied with an ISO 5211 actuator interface. As an option, a 3/2-way valve can be installed which automatically vents the actuator via the changeover lever of the manual gearbox.