Rotork DSIR gearbox speeds up manual valve operation
To achieve this, the DSIR has two gearing ratios. Switching between the ratios is simply a matter of pushing or pulling on the input shaft. The high 4.25:1 ratio gearing is used for the portion of the valve stroke where the torque requirement is high, which is usually at the beginning and the end of the stroke. In midtravel the valve torque generally drops considerable and therefore the low 1:1 ratio gearing can be used to reduce the number of input turns required. This can provide a 70% reduction in the number of turns required and the operating time.
Manufactured from cast iron with carbon and alloy steel shafts and gearing, the rugged DSIR is designed for arduous operation in an ambient temperature range of -40ºC to +120ºC. The standard enclosure specification is watertight to IP67, with IP68 optionally available. Other options include output machining for mounting directly to a valve, flexible drive extensions and a padlockable facility. It is also possible to lock the gearbox drive in either of the two gearing ratios.
Tel: 0113 205 7276
Published in Valve User Magazine Issue 21
- Mastergear - Driving Industry
- Challenging application launches Rotork’s compact subsea gearbox solution
- Alpha Controls’ Range of Accessories
- Alpha Controls Ltd
- Rotork gearboxes provide 90 degree shaft direction change
- AUMA gearboxes support world’s largest hydraulic scheme
- Zoedale Plc add a new quarter-turn gearbox range to their actuator combinations
- Rotork’s big valve gearboxes assist the supply of fresh water to Shanghai
- Quickits Launch Stainless Steel Gearbox Range
- IB series bevel gearboxes manufactured by Rotork Gears: Two sites, four million cubic metres of oil, four hundred and sixty-nine Rotork actuators