The relationship between the adjustment ranges of the turbine governor, hydraulic actuator, and control combination valve

I don’t understand, OP:):) Just passing by:victory: Haha

OP, this understanding is incorrect. As the turbine speed is adjusted from zero to its maximum continuous speed, the travel scale of the hydraulic actuator corresponds to a range from 0 to 100; this scale refers to the opening degree of the main steam valve

What does the opening degree of the main valve mean? In a turbine, 100 corresponds to the maximum designed speed of the chamber; however, the control valve still has some margin of adjustment. Moreover, differences in intake pressure and load result in different speeds corresponding to the same opening degree of the intake valve. In such cases, this is generally under the conditions specified in the design

This post was last edited by 2ndliver on 2009-10-25 at 12:44. From what I’ve seen, the situation in our crew is not at all like that. When adjusting the speed of a turbine from zero to its maximum continuous speed, the scale corresponding to the travel of the hydraulic actuator is certainly not a simple range from 0 to 100; rather, it has a midpoint at zero, with values increasing gradually upwards and downwards to 10 major marks, each of which is further divided into four minor marks. The normal scale range is determined by the instrument based on the PID parameters, and it is also indicated on-site. Typically, when the PID shows that the control valve is fully open, the scale reading for the hydraulic actuator is 6. Another way of indicating this is in millimeters: the maximum travel distance of the hydraulic actuator is 150 millimeters, and when the control valve is fully open, the actuator’s travel distance is 80 millimeters. Someone upstairs confused the main steam valve with the control valve. The main steam valve does not show its opening degree, nor can its opening be adjusted, as it is only in one of two states: fully open or fully closed (of course, for machines that use the main steam valve for starting up, the starting process can be controlled by adjusting the opening degree of this valve). 1# dahuafei23

The speed of the turbine is related to the stroke of the hydraulic actuator, but it isn’t a 1:1 correspondence; the speed depends not only on the opening degree of the hydraulic actuator and the main steam valve. When the steam pressure and temperature are insufficient, even if the hydraulic actuator is at 100% opening, the turbine cannot reach its maximum continuous speed, and factors such as the load on the connected equipment also play a role.

The stroke of the main steam valve and that of the hydraulic actuator are not the same concept; only when the main steam valve is fully open can the hydraulic actuator be used to adjust the air intake volume, thereby further regulating the speed

The stroke of the main steam valve and that of the hydraulic actuator are not the same concept; only when the main steam valve is fully open can the hydraulic actuator be used to adjust the air intake volume, thereby further regulating the speed

The main steam valve is usually either fully open or fully closed; it is rare to see it used for starting up the plant by using the force generated by the main steam valve. Only when the main valve is fully open can the speed be adjusted by using a hydraulic actuator to control the regulating valve and thus regulate the amount of steam entering the cylinder. As I understand it, the turbine speed range of 0 to the maximum continuous speed does not necessarily correspond to the hydraulic actuator range of 0 to 100; rather, it’s some value within that range. For example, if I set 10 to correspond to a speed of 0, this value may vary from unit to unit. It’s just my guess – I don’t have any relevant data available – so please feel free to correct me