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Treatment method in which the control valve is often stuck or blocked
Source:Network
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Author:Alliance
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Published time: 2019-10-28
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Control valves, in the field of industrial automation process control, by accepting the control signals output by the control unit, by means of power operation to change the final control elements of the process parameters such as medium flow, pressure, temperature, liquid level.
Control valves, in the field of industrial automation process control, by accepting the control signals output by the control unit, by means of power operation to change the final control elements of the process parameters such as medium flow, pressure, temperature, liquid level. It usually consists of an actuator and a valve. According to the characteristics of the stroke, the regulating valve can be divided into straight stroke and angular stroke; according to the power used by the actuator, it can be divided into three types: pneumatic regulating valve, electric regulating valve and hydraulic regulating valve; according to its function and characteristics There are three kinds of linear characteristics, equal percentage characteristics and parabolic characteristics. The regulating valve is suitable for air, water, steam, various corrosive media, mud, oil and other media.Control valves' number is usually the beginning of FV. Commonly used classification of control valves: pneumatic control valve, electric control valve, hydraulic controlvalve, self-operated control valve.
When the control valve is often stuck or blocked during use, how do we deal with it? Here are a few ways to deal with these issues.
1.Cleaning method
The welding slag, rust, slag, etc. in the pipeline are blocked or jammed in the orifice, the guiding part and the balance hole of the lower bonnet, causing strain and scratches on the curved surface of the valve core, the guiding surface, and indentation on the sealing surface, etc. This often happens in the early stages of the new commissioning system and after the overhaul. This is the most common failure. In this case, it must be unloaded for cleaning, remove the slag, if the sealing surface is damaged, it should be ground; at the same time, the bottom plug is opened to wash off the slag falling into the lower bonnet from the balance hole, and the pipeline Rinse. Before commissioning, let the control valve open completely, and the medium will flow into the normal operation after a period of time.
2. External scouring method
When some media that are easy to precipitate and contain solid particles are adjusted by ordinary valves, they are often blocked at the throttle and guide, and the gas and steam can be flushed at the bottom of the lower bonnet. When the valve is blocked or jammed, open the external gas or steam valve to complete the flushing operation without moving the control valve to make the valve operate normally.
3. Install the pipeline filter method
For small-diameter control valves, especially ultra-small flow regulating valves, the throttle gap is very small, and there should be no slag in the medium. In case of blockage, it is best to install a filter on the pipe in front of the valve to ensure the smooth passage of the media. With the control valve used by the positioner, the positioner does not work properly, and the blockage of the air passage throttle is the most common fault. Therefore, when working with the positioner, the air source must be handled. The usual method is to install an air filter pressure reducing valve on the air supply line before the positioner.
4. Straight through to the angle method
The straight-through flow is inverted S, the flow path is complicated, and there are many dead zones in the upper and lower chambers, which provide a place for the precipitation of the medium. The angular connection, the medium is like flowing through the 90 °C elbow, the scouring performance is good, the dead zone is small, and it is easy to design into a streamline shape. Therefore, the use of a straight-through control valve can be changed to an angle valve when it is slightly blocked.
When the control valve is often stuck or blocked during use, how do we deal with it? Here are a few ways to deal with these issues.
1.Cleaning method
The welding slag, rust, slag, etc. in the pipeline are blocked or jammed in the orifice, the guiding part and the balance hole of the lower bonnet, causing strain and scratches on the curved surface of the valve core, the guiding surface, and indentation on the sealing surface, etc. This often happens in the early stages of the new commissioning system and after the overhaul. This is the most common failure. In this case, it must be unloaded for cleaning, remove the slag, if the sealing surface is damaged, it should be ground; at the same time, the bottom plug is opened to wash off the slag falling into the lower bonnet from the balance hole, and the pipeline Rinse. Before commissioning, let the control valve open completely, and the medium will flow into the normal operation after a period of time.
2. External scouring method
When some media that are easy to precipitate and contain solid particles are adjusted by ordinary valves, they are often blocked at the throttle and guide, and the gas and steam can be flushed at the bottom of the lower bonnet. When the valve is blocked or jammed, open the external gas or steam valve to complete the flushing operation without moving the control valve to make the valve operate normally.
3. Install the pipeline filter method
For small-diameter control valves, especially ultra-small flow regulating valves, the throttle gap is very small, and there should be no slag in the medium. In case of blockage, it is best to install a filter on the pipe in front of the valve to ensure the smooth passage of the media. With the control valve used by the positioner, the positioner does not work properly, and the blockage of the air passage throttle is the most common fault. Therefore, when working with the positioner, the air source must be handled. The usual method is to install an air filter pressure reducing valve on the air supply line before the positioner.
4. Straight through to the angle method
The straight-through flow is inverted S, the flow path is complicated, and there are many dead zones in the upper and lower chambers, which provide a place for the precipitation of the medium. The angular connection, the medium is like flowing through the 90 °C elbow, the scouring performance is good, the dead zone is small, and it is easy to design into a streamline shape. Therefore, the use of a straight-through control valve can be changed to an angle valve when it is slightly blocked.
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