2013-08 / 04 Catalogue LM1 - 008 UK Page 3 Edition Description / Function The DMO pneumatic gearwheel motors have been designed for permanent operation under harsh conditions. Air, nitrogen or a similar gas mix is supplied to the motor via a hose or pipeline DN50. As a medium temperature, we recommend a max. temperature of 60-70 °C. The ambient temperature or heat radiation should not exceed 70-90 °C. At different temperatures, please contact our technical department. Generally, the following components are installed upstream of the motor in the supply line: - Ball valve DN50 In case of prolonged standstill, the closed ball valve prevents leakage losses at the downstream components and at the control slide of the motor. It makes it possible to carry out maintenance work to the motor and the upstream components. - Dirt trap DN50 (filter mesh 0.3 mm to 1.0 mm) A strainer filter with a mesh of approx. 3.0 mm is located at the motor inlet to prevent the inflow of coarse particles. The upstream dirt trap increases functioning reliability and reduces the risk of jamming of the control slide. - Pressure reducer in case of storage operation As the storage medium is under heavy pretension by reasons of volume, a pressure reducer must be provided downstream of the ball valve to bring the pressure medium down to operating pressure. - Maintenance unit Comprises a moisture trap, a pressure reducing valve, and an oiler and is provided between the ball valve and the motor inlet. The moisture trap with level indicator filters moisture from the air to prevent icing up after air expansion in the motor casing and at the air outlet during permanent operation. The working pressure, which should be as constant as possible, is set at the pressure-reducing valve. The oiler with oil level indicator supplies the working air with an oil mist for lubrication and avoidance of corrosion of the control slide, the rotors and bearings. The DMO pneumatic motor comprises: - Differential pressure oiler Downstream of the motor inlet, the working air flows through the differential pressure oiler which is designed for horizontal installation of the motor. If the motor is installed vertically or in inclined position, a separate oiler is provided upstream of the motor. Function: A back pressure nozzle installed in the air inlet of the differential pressure oiler reduces the working air flow in the area of the nozzle so that the air presses on the oil level of the oil container which is connected to the flowing working air via a small air channel upstream of the back pressure nozzle. Downstream of the back pressure nozzle, the pressure drops by reason of the higher flow speed created by the reduction of the air flow. This pressure difference between the front and the rear edge of the back pressure nozzle causes a small amount of oil to flow through a nozzle opening into the working air flow behind the back pressure nozzle; from there, the oil is carried along with the working air flow and, finely atomized, supplied to the lubrication points (speed controller, control slide, bearings, rotors).
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