Is the inability to open the control valve of the pipeline related to the medium?

The inability to open the control valve on the device’s pipeline may indeed be related to the pressure of the medium inside the pipeline. Specifically, there are several key factors that can lead to this situation: 1. **Large pressure difference**: If the pressure difference of the medium across the control valve is significant, especially when the pressure at the output side (behind the valve) is much lower than that at the input side (in front of the valve), the force inside the valve is not sufficient to overcome this pressure difference, which may result in the valve being difficult to open. 2. **Medium properties**: Some media (such as steam or other viscous fluids) can, under certain conditions, cause the mechanical components inside the valve to stick together or get stuck, thereby affecting the valve’s operation. 3. **Mechanical failures**: Mechanical problems with the valve itself, such as worn seals or failures in the driving mechanism (e.g., electric or pneumatic devices), can also lead to difficulties in operating the valve. The issue you mentioned (where the steam control valve cannot be closed and must be closed by releasing pressure) is usually caused by the reduction in internal resistance once the pressure on both sides of the valve is balanced, which makes it easier to operate the valve. In this case, pressure relief can effectively reduce the pressure difference across the valve, thereby making it easier to operate. In short, if the control valve cannot be opened or closed, it is recommended to check whether the medium pressure is appropriate, whether the valve requires maintenance (lubrication or cleaning), and whether the actuation mechanism is functioning properly. I hope this can help you. .

Could you provide more details on the type of valve and its driving mechanism? In the case of a Globe type valve, provided that the selection is correct from the outset~ (taking into account only changes in operating conditions, without considering valve failures), 1. If the internal components of the valve are of the flow-blocking type and the pressure before the valve increases compared to what was assumed at the time of selection, this will prevent the valve from opening ； 2. The valve internals are of the flow-open type; if the pressure in front of the valve increases compared to that at the time of selection, it will not be possible to close the valve ；

When selecting a valve, the maximum closing pressure difference must be taken into account