There is a fault with the oil actuator of the turbine in Hangqi; the original stroke was 68.1 mm, but now the total stroke is only 38 mm
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The hydraulic actuator will operate only when the maximum signal value is applied； Additionally, the piston rod of the hydraulic actuator moves only downward and not upward. Could someone with more experience give some advice?
This question is actually a continuation of your previous topic. In my opinion: 1. The lubricating oil system must undergo appropriate replacement and cleaning procedures to ensure that the oil meets the requirements for operation. (From the appearance of the machine, it seems that the unit has not been well maintained...) 2. Contact Hangqi technical service personnel to inquire about related issues. 3. Is the quality of the steam system meeting the specified standards, and is there any occurrence of steam salt deposition?
Judge them separately! First, check whether the electrical signal of 4-20mA can correspond to the oil pressure. If it can, the issue with the electro-hydraulic converter can be ruled out, and the problem will lie in the hydraulic actuator. Disconnect the valve stem and test the stroke of the hydraulic actuator separately; if a problem is detected with the stroke at this point, it will be necessary to disassemble the spool valve of the hydraulic actuator to take a look
The stroke of the oil actuator has been tested; the original stroke was 68.1 mm, but now the total stroke is only 38 mm. The oil actuator operates only when it receives the maximum signal value
The oil pressure is normal, right? Is the spool newly replaced? Is the size the same as the original one?
Oil pressure is normal; the spool valve has not been replaced
It might be a problem with the pilot valve of the hydraulic actuator or the bearings; it’s just a guess. I look forward to seeing how the original poster handles this issue. In my opinion, when encountering such a problem, one should first contact professionals to come to the factory and make a diagnosis, and prepare enough spare parts in advance so as to be ready for a short-term shutdown for replacement, rather than stopping operations first to figure out the cause – that’s very time-consuming, and it can cause trouble if the necessary parts are not available.
It seems that the steam valve is severely scaled and blocked. . .
Check the electro-hydraulic converter; examine the wrong throttle spool – it is very likely that this is a fault related to the throttle
Internal leakage, or leakage in the fuel supply system
Gentle experts, the issue has been resolved. It was caused by sludge blocking the space between the short pin that presses down on the feedback lever when the throttle is misused and the housing, preventing it from moving up and down! Thank you all!