The issue with the orifice plate in the emergency throttle cut-off mechanism
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Why can’t the orifice plate (13) in the throttle pressure oil for emergency shutdown be too large? If it is too large, the throttle will lose its ability to shut down quickly. Why? Isn’t it to release the oil pressure? The larger the pressure oil orifice plate, the faster it should drain! Also, could those who are more experienced please provide a schematic diagram of this oil control system? The animations available online are incomplete – the diaphragm valves, as well as various oil circuits related to the quick-shut oil and safety oil, are not shown. Thank you very much!
The oil drain hole is where the quick-shut oil is connected to the return oil! It varies depending on the change in the oil circuit path! It simply cuts off the quick-shut oil to the quick-shut assembly, and the quick-shut valve closes rapidly under the action of the spring!
The pressure oil P has one return path; the hole is too large, resulting in a nearly constant amount of oil returning. If the pressure of the oil is too high, it prevents the spool from moving to the left, and it becomes impossible to release the quick-shut oil.
If the orifice plate is enlarged arbitrarily, it will cause an increase in the pressure behind the orifice plate, thereby increasing the thrust on shoulder 6. This may prevent the slide valve from moving to the left, preventing the pressure oil and quick-shut oil from being released, and resulting in the failure of the emergency safety device.